refactor(contacts): simplify the sync engine's gates and context

- The worker no longer pre-checks specialDatesEnabled: the engine already
  gates on it, and the worker now consumes the previously-unreachable
  Disabled result instead (without recording a run).
- ReminderContext drops the timed defaults it could never use — managed
  events are always all-day — saving two DataStore reads per sync.
- createCalendar no longer persists the calendar id itself;
  reconcileCalendars is the single place ids are recorded (it always
  followed up with the same write).
- The title-template fallback uses the shared resolveTitleTemplate.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitea/ISSUE_TEMPLATE/crash_report.md

@@ -5,6 +5,7 @@ title: "Crash: "
 labels:
   - bug
   - crash
+  - priority:high
 ---
 
 <!--

.gitea/ISSUE_TEMPLATE/feature_request.md

@@ -3,7 +3,7 @@ name: Feature request
 about: Suggest an idea or improvement
 title: ""
 labels:
-  - enhancement
+  - feat
 ---
 
 ### What would you like Calendula to do?

.gitea/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,19 @@
+---
+name: Question
+about: Ask how something works or get help using Calendula
+title: ""
+labels:
+  - question
+---
+
+### Your question
+
+
+### What you've tried
+<!-- so far, if anything -->
+
+
+### Context
+- Calendula version: <!-- Settings → bottom of the screen -->
+- Android version:
+- Device:

.planning/ROADMAP.md

@@ -230,7 +230,7 @@ pass on the existing controls; new toggles ride in with their own features.
 
 **Tier 3 — platform reach (depends on Tier 2)**
 7. ~~Home-screen widget — built on the agenda data source from #6~~ *(done, v2.5.0 — agenda + month widgets)*
-8. App shortcuts: ~~launcher long-press → New event~~ *(done, v2.5.0)*; optional quick-settings tile still open
+8. App shortcuts: ~~launcher long-press → New event~~ *(done, v2.5.0)*; ~~quick-settings tile~~ *(done, v2.8.0 — "New event" QS tile)*
 
 **Tier 4 — reliability, data-safety & interop** *(re-ranked 2026-06-17)*
 9. **Reminders — defaults + delivery reliability** *(shipped v2.6.0)* — global
@@ -251,37 +251,38 @@ pass on the existing controls; new toggles ride in with their own features.
     decision (snooze must re-fire an alarm).
 
 **Tier 5 — close the read/write gap on the event model** *(opened 2026-06-22)*
-12. **Attendee editing** *(next — promoted from the gated "Locations & People"
-    bucket, owner says high-importance 2026-06-22)* — attendees are already
-    *read* (queried, mapped, shown on the detail screen since v0.6) but the
-    event form can't *write* them, the last big read-only gap in the event
-    model. Add an attendees section to `EventEditScreen` / `EventForm`: add by
-    typed email (contact-picker entry can follow later), edit/remove rows, set
-    role (required / optional) — writing `CalendarContract.Attendees` rows on
-    insert + dirty-checked update, mirroring the reminders-diff pattern.
-    **Caveat to resolve first:** writing `Attendees` rows triggers sync-adapter
-    *invitation* behavior that differs by backend (Google auto-emails invites;
-    DAVx5/CalDAV writes the `ATTENDEE` property and lets the server decide) —
-    decide and document what Calendula promises before building. Full sketch in
-    "Attendee editing" under Locations & People below.
+12. **Attendee editing** *(shipped — merged into release/v2.8.0, `feat/attendee-editing`
+    MR !29 / commit `b0f34ff`, 2026-06-22)* — closed the last big read-only gap in
+    the event model: attendees were already *read* (queried, mapped, shown on the
+    detail screen since v0.6) and are now *writable* from the form. An attendees
+    section on `EventEditScreen` / `EventForm` adds by typed email **or** the
+    no-permission contact picker, edits/removes rows, and sets role (required /
+    optional) — writing `CalendarContract.Attendees` rows on insert + dirty-checked
+    update, mirroring the reminders-diff pattern. The sync-adapter *invitation*
+    caveat was **settled record-only** (Calendula never sends invites; the backend
+    decides delivery) — full sketch + decision in "Attendee editing" under Locations
+    & People below.
 
 **Gated — explicit go/no-go before any work (mostly INTERNET-permission calls)**
 - Remote calendar create/edit (re-implements DAVx5; INTERNET + credential storage)
-- Locations & People — contact address picker (no-permission, one-shot) is the safe entry; OSM autocomplete needs INTERNET
+- Locations & People — the no-permission contact pickers already shipped (location v2.8.0, attendee email v2.8.0); what remains gated is OSM autocomplete (needs INTERNET)
 - Move event to another calendar — sync-adapter minefield (copy+delete model)
 
 **Bottom — deprioritised, not important**
 - Duplicate event (detail action → prefilled create form) — moved here
   2026-06-17; cheap but low value, pick up only if asked
 
-**Unranked / fill-in** — pinch-to-zoom time scale, tablet/foldable layouts,
-full-text search. Pulled in opportunistically, not sequenced.
+**Unranked / fill-in** — pinch-to-zoom time scale, tablet/foldable layouts.
+Pulled in opportunistically, not sequenced.
 
 Tier 4 is now fully shipped (#9 reminders defaults v2.6.0, #10 `.ics`
-export/import v2.7.0, #11 snooze/dismiss in release/v2.8.0; drag-drop rejected).
-**Next committed work is Tier 5 #12 — attendee editing** (the last read-only gap
-in the event model). After it: the theme-group ideas and Tier 2/3 leftovers
-(quick-settings tile, now-line, week numbers in month, full-text search).
+export/import v2.7.0, #11 snooze/dismiss in release/v2.8.0; drag-drop rejected),
+and Tier 5 #12 — attendee editing — shipped in release/v2.8.0, closing the last
+read-only gap in the event model. v2.8.0 also cleared most Tier 2/3 leftovers —
+full-text search, the "New event" Quick Settings tile, and the now-line all
+shipped there. **No tier work is currently committed as next;** the remaining
+candidates are unscheduled theme-group ideas (pinch-to-zoom, tablet/foldable,
+accessibility pass) plus the gated go/no-go items.
 
 ## Navigation & views
 
@@ -291,24 +292,22 @@ in the event model). After it: the theme-group ideas and Tier 2/3 leftovers
 - Agenda view (fourth view: upcoming events grouped by day; also the
   natural data source for a future widget)
 - Jump to date — drawer date picker (un-cut from V1)
-- Current-time "now" line in day/week — standard in every calendar, cheap,
-  currently absent. Daily-driver polish.
-- Week numbers in the **month** grid — week view already shows the badge
-  (`WeekNumberBadge`, `WeekScreen.kt`); extend to month for ISO/European users.
+- ~~Current-time "now" line in day/week~~ **shipped v2.8.0**
+- Week numbers in the **month** grid — **rejected** (owner decision): clutters
+  the view and shrinks the day cells; the badge stays week-view-only.
 - Pinch-to-zoom time scale in day/week
 - Tablet / foldable layouts *(was v3.0)*
-- Full-text search *(was v3.0)* — promote out of "fill-in": for a daily driver
-  with real event history, finding an event is core completeness, not optional.
+- ~~Full-text search~~ **shipped v2.8.0** — for a daily driver with real event
+  history, finding an event is core completeness, not optional.
 
 ## Event editing & creation
 
 - Duplicate event (detail action → prefilled create form)
-- **Per-event color** (`Events.EVENT_COLOR`, OptionCard picker in the form)
-  *(next)* — chosen to follow the in-progress tap-to-create + calendar
-  management work: reuses the color-picker component and palette plumbing
-  being built for local calendar management, and finishes the create/edit
-  theme. `EVENT_COLOR` / `EVENT_COLOR_KEY` from the calendar's color list
-  (`Colors` table, `TYPE_EVENT`); falls back to the calendar color when unset.
+- ~~**Per-event color**~~ *(shipped v2.4.0)* — `EVENT_COLOR` / `EVENT_COLOR_KEY`
+  from the calendar's color list (`Colors` table, `TYPE_EVENT`), OptionCard
+  picker in the form, falling back to the calendar color when unset. Reused the
+  color-picker component and palette plumbing from local calendar management and
+  finished the create/edit theme.
 
 ## Calendars & accounts
 
@@ -337,7 +336,63 @@ in the event model). After it: the theme-group ideas and Tier 2/3 leftovers
   `.ics` file (SAF); restore is the bulk-import path (pick a calendar, dedup by
   UID). Closed the silent data-loss gap.
 
-## Reminders — defaults & delivery reliability *(implemented 2026-06-17, `feat/default-reminders` — pending on-device review)*
+### Disable a calendar in-app *(captured 2026-06-25)*
+
+A second, heavier visibility level **above** the existing per-view filter. Today
+the drawer's calendar filter (`hiddenCalendarIds` in `CalendarPrefs`) only hides
+a calendar's *events* from the month/week/day/agenda views — the calendar itself
+still clutters the drawer filter list, the event-form calendar picker, and the
+import target picker. "Disable" removes a calendar from the app's surfaces
+entirely; "hide" stays the lightweight, frequently-toggled control.
+
+**Two-level model (both kept):**
+- **Hidden** (existing) — `hiddenCalendarIds`; a quick per-view checkbox in the
+  drawer. Toggles events on/off in the views; the calendar stays listed
+  everywhere. Operates only over the *enabled* calendars.
+- **Disabled** (new) — the calendar is gone from the app: not in the drawer
+  filter list, not in the event-form picker, not in the import picker, and its
+  events never appear (it's gated out of `instances()` like a hidden one). It
+  remains visible **only** in Settings → Calendars, where the enable/disable
+  toggle lives, so it can be brought back.
+
+**Storage — app-side (DataStore), mirrors the hidden set.** Add
+`disabledCalendarIds: Set<Long>` + `setDisabledCalendarIds(...)` to
+`CalendarPrefs` (comma-separated string key, same shape as `hiddenCalendarIds`).
+**Does not touch** `CalendarContract.Calendars.VISIBLE` / `SYNC_EVENTS` — purely
+a Calendula-local preference, so other calendar apps are unaffected and the sync
+adapters stay out of it (privacy-clean, reversible).
+
+**Where the disabled set is applied:**
+- `CalendarRepositoryImpl.instances()` + `searchEvents()` — exclude
+  `calendarId ∈ (hidden ∪ disabled)` so a disabled calendar's events never show
+  and aren't searchable. (`repository.calendars()` itself stays unfiltered/raw —
+  the screens that need everything still get everything.)
+- `FilterViewModel.state` — drop disabled calendars from the drawer filter list
+  (you can't hide/show what's disabled).
+- `EventEditViewModel.writableCalendars` — exclude disabled, so you can't create
+  into a calendar you've removed from the app. Handle the last-used-calendar
+  preselect falling on a now-disabled calendar (fall back to first enabled
+  writable).
+- `ImportViewModel` — exclude disabled from the import target list.
+- `CalendarsScreen` / `CalendarsViewModel` — the **only** surface that lists
+  disabled calendars; add `setDisabled(id, Boolean)` and a per-calendar toggle.
+
+**UI — Settings → Calendars (no new tab).** Add an enable/disable control to each
+row on the existing `CalendarsScreen` (both the local and the synced/read-only
+groups — disabling is an app-side view choice, independent of write access).
+Disabled rows render visibly de-emphasised (dimmed) but keep the toggle so
+they're re-enableable. Follow the project dialog/list conventions (M3 grouped
+list, `option-card-modal-style-default` if a confirm/selection surface is needed).
+
+**Decided behaviour:**
+- All calendars disabled → views show the existing empty state.
+- A disabled calendar that still holds events: events simply vanish from
+  views/search until re-enabled (no data touched — it's a filter, not a delete).
+- Deep links / notifications pointing at an event in a disabled calendar still
+  open its detail screen — detail is a direct id lookup, not an `instances()`
+  query, so disabling never strands an existing link.
+
+## Reminders — defaults & delivery reliability *(shipped v2.6.0; built on `feat/default-reminders`)*
 
 Two themes bundled because both are "make reminders trustworthy" — the core of
 the "Calendula is your only calendar app" promise.
@@ -414,18 +469,20 @@ it directly undermines the feature's premise, so it rides in here.
   settings so users can verify delivery on their specific OEM (Samsung / Xiaomi
   are notorious for suppressing it).
 
-### Open decisions (resolve before building)
+### Decisions made (as shipped in v2.6.0)
 
-1. Self-schedule via `AlarmManager` vs trust the provider broadcast
-   (reliability vs simplicity + battery cost).
-2. All-day reminder representation (minutes-before vs absolute time-of-day).
-3. Where per-calendar overrides live in the UI (rows on the Calendars screen vs
-   a list inside the Notifications sub-page).
+1. **Provider broadcast kept** — did not self-schedule via `AlarmManager`; the
+   battery-optimisation exemption is the reliability lever (simplicity + battery
+   cost won over the exact-alarm subsystem).
+2. **All-day reminders = minutes-before-midnight** (day-scale presets); absolute
+   time-of-day ("9am the day before") deferred — see the deferred list above.
+3. **Per-calendar overrides live in the Notifications sub-page** (override list),
+   governing timed events only.
 
-### Later (round two)
+### Round two
 
-- Snooze + dismiss actions on the notification (snooze needs an
-  exact-alarm / WorkManager decision) — Tier 4 #13.
+- ~~Snooze + dismiss actions on the notification~~ *(shipped in release/v2.8.0,
+  Tier 4 #11)* — snooze re-fires a snooze-only exact alarm.
 
 ## Sharing & interop
 
@@ -438,8 +495,8 @@ it directly undermines the feature's premise, so it rides in here.
 ## Platform & launchers
 
 - ~~Home-screen widget~~ **shipped v2.5.0** — agenda + month widgets
-- ~~App shortcuts (launcher long-press → New event)~~ **shipped v2.5.0** —
-  optional quick-settings tile still open
+- ~~App shortcuts (launcher long-press → New event)~~ **shipped v2.5.0**
+- ~~"New event" Quick Settings tile~~ **shipped v2.8.0**
 
 ## Quality & reliability
 
@@ -455,9 +512,10 @@ it directly undermines the feature's premise, so it rides in here.
 Beyond classic calendar-client scope; discussed, deliberately not planned
 in detail yet:
 
-- **Contact address picker** for the location field via the system picker
-  (`ACTION_PICK` on postal addresses) — one-shot, needs no READ_CONTACTS,
-  fits the privacy story. Same mechanism later for picking emails.
+- ~~**Contact address picker** for the location field via the system picker
+  (`ACTION_PICK`)~~ **shipped v2.8.0** — one-shot, needs no READ_CONTACTS, fits
+  the privacy story. The same no-permission mechanism was then reused for the
+  attendee email picker (v2.8.0).
 - **OSM address autocomplete** in the location field (type "Brandenburger
   Tor" → tap suggestion → resolved address inserted). Backend would be
   Photon (Nominatim's public policy forbids autocomplete). **Requires the

CHANGELOG.md

@@ -5,6 +5,148 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Added
+- See your contacts' birthdays and anniversaries in your calendar. A new,
+  **optional** feature (Settings → Contact special dates) mirrors your contacts'
+  birthdays, anniversaries and other dates into local "Birthdays",
+  "Anniversaries" and "Other dates" calendars that stay in sync as your contacts
+  change. Each is a normal local calendar, so you set its colour, visibility and
+  reminders the usual way — new birthdays even start with a reminder a week before
+  *and* on the day. The title format is yours to customise (`{name}`, `{year}`).
+  This is the first feature to use the contacts permission: it is requested only
+  when you turn the feature on, everything stays on your device (Calendula has no
+  internet access), and your contacts are only ever read, never changed. Thanks
+  to @moonj for the suggestion ([#15]).
+- Set more than one default reminder per calendar. A calendar's default
+  reminders — and the global defaults under Settings → Notifications — can now
+  hold several lead times instead of just one, so new events can start with, say,
+  a reminder a week before *and* one on the day. The reminder pickers are now
+  multi-select; per-calendar overrides can still inherit the global default or
+  turn reminders off entirely. Thanks to @moonj for the suggestion ([#14]).
+
+### Fixed
+- Disabled calendars no longer notify. Reminders for events in a calendar you
+  have disabled (Settings → Calendars) are now suppressed instead of still
+  popping up — matching how a disabled calendar's events already stay hidden
+  everywhere else in the app ([#17]).
+- Editing a single occurrence of a recurring event works again. Choosing **Only
+  this event** and saving a change to one event in a repeating series silently
+  did nothing — the change was rejected and the edit form simply reappeared with
+  nothing applied. The edited occurrence is now stored correctly, so the change
+  lands on just that one event and leaves the rest of the series untouched
+  ([#16]).
+
+## [2.12.0] — 2026-06-28
+
+### Added
+- See past events your way. Two new settings change how events that have already
+  ended are shown. **Past events** (Settings → Appearance → Agenda) lets the
+  agenda — both in the app and the home-screen "Upcoming" widget — keep them as
+  usual, dim them, or hide them from the list entirely. **Dim completed events**
+  (Settings → Appearance) separately fades finished events in the month and week
+  views. Both are off by default, an event only counts as finished once it has
+  actually ended (events still in progress are never dimmed), and the lists
+  update on their own as the day goes on. Thanks to @ptab for the suggestion
+  ([#12]).
+
+### Changed
+- Readable titles on overlapping events. In the week and day views, events that
+  overlap split a day into slim columns where the title used to be clipped to a
+  character or two. The title now wraps across as many lines as the block can
+  fit, and the time is hidden on those narrow blocks so the name can fill the
+  space — so you can tell events apart without opening each one. Thanks to @ptab
+  for the suggestion ([#13]).
+
+## [2.11.2] — 2026-06-28
+
+### Added
+- Jump straight to typing a title. When you start a new event, Calendula now puts
+  the cursor in the title field and opens the keyboard right away, so you can type
+  the name without an extra tap. It's on by default and only affects creating an
+  event — editing never grabs focus — and a new **Focus title on new event**
+  switch (Settings → New event form) turns it off. Thanks to @abrossimow for the
+  suggestion ([#10]).
+
+## [2.11.1] — 2026-06-28
+
+### Fixed
+- Calendula can now be set as your default calendar app. It registers the
+  calendar-app intent filters the system uses, so it appears in the chooser when
+  you tap a date in a launcher or clock — and opening one takes you straight to
+  that day. Android has no way for an app to make itself the default, so you pick
+  it once from the system picker. Thanks to @abrossimow for the report ([#9]).
+
+## [2.11.0] — 2026-06-27
+
+### Added
+- Start the week on any day. The **Week starts on** setting (Settings →
+  Appearance) now offers every weekday — not just Monday or Sunday — alongside
+  the automatic, locale-based default. Thanks to @zmaherdev for the suggestion
+  ([#3]).
+- Choose a 12- or 24-hour clock. A new **Time format** setting (Settings →
+  Appearance) lets you force a 12-hour (2:00 PM) or 24-hour (14:00) clock, or
+  follow the system setting automatically. It applies everywhere times appear —
+  the week and day timelines, agenda, event details, search and reminders — so
+  the format is now consistent across the whole app. Thanks to @zmaherdev for
+  the suggestion ([#6]).
+- Optional hour lines in the timeline. A new **Hour lines** switch (Settings →
+  Appearance) draws a faint separator at each hour in the week and day views,
+  making it easier to see when events start and end. Off by default. Thanks to
+  @zmaherdev for the suggestion ([#5]).
+- Limit how far ahead the agenda looks, and switch it on the fly. New **Agenda
+  range** and **Agenda widget range** settings (Settings → Appearance) let the
+  agenda screen and its home-screen widget each show just today, the rest of this
+  week, the rest of this month, a rolling 7 or 30 days, or a custom number of
+  days — "This week" follows your week-start. The agenda also gains a bar at the
+  top naming the exact dates in view, with a button to switch the range just for
+  the current session (it resets when you reopen the app); the bar can be turned
+  off. Thanks to @zmaherdev for the suggestion ([#4]).
+- Automatic backup of local calendars. A new **Automatic backup** option
+  (Settings → Calendars → Backup) periodically exports your local calendars to an
+  `.ics` file in a folder you choose, on an interval you set (from 30 minutes up).
+  Useful for file-based syncing such as Syncthing, or simply as a safety net — it
+  is a one-way export and never touches your synced accounts. Thanks to @shield
+  for the discussion that inspired it ([#7], [#8]).
+- Field icons in the event-form settings. Each optional-field toggle (Settings →
+  Event form) now shows the same icon the field uses in the new-event form, so
+  the list is easier to scan.
+- Help translate Calendula. A **Help translate** link at the top of **Settings →
+  App language** opens the project's Weblate, where you can add or improve a
+  language in your browser — no coding needed. Contributions in any language are
+  welcome.
+
+### Changed
+- Tidied **Settings → Appearance** into clearer groups (theme & colour, calendar,
+  agenda), and the agenda's empty state now reads "You're all caught up".
+- Reworked **Settings → Calendars**. Local and synced calendars are now grouped
+  into collapsible, source-branded cards — each account shows its app's icon —
+  with a per-account menu to enable or disable all of its calendars at once or
+  open the account in its source app.
+- Reorganised **Settings → Notifications**: reliable-delivery and snooze settings
+  moved up with the other global reminder options, and the per-calendar reminder
+  overrides now fold into a single expandable section.
+- Moved **Add Quick Settings tile** out of the event-form section to its own
+  top-level entry in Settings.
+
+## [2.10.0] — 2026-06-25
+
+### Added
+- Turn a calendar off across the whole app. Settings → Calendars now has a
+  switch on every calendar — both your own and synced ones. Switching one off
+  removes it everywhere: its events disappear from all views and search, and it
+  drops out of the drawer's hide/show filter, the event-form calendar picker and
+  the import target picker. Unlike hiding (the quick per-view checkbox in the
+  drawer), a disabled calendar leaves the app entirely until you turn it back on.
+  Nothing is deleted and no other app is affected — it's a Calendula-only view
+  choice — so you can re-enable it any time from the same screen, where disabled
+  calendars stay listed but dimmed.
+- An optional way to support development. Settings → About now has a "Support
+  development" button that opens Ko-fi in your browser. It's a plain donation
+  link with no perks attached, and it needs no new permissions — Calendula still
+  has no internet access of its own and just hands the link to your browser.
+
 ## [2.9.0] — 2026-06-25
 
 ### Added
@@ -610,3 +752,17 @@ automatically, with zero telemetry and no internet permission.
 
 [#1]: https://codeberg.org/jlmakiola/calendula/issues/1
 [#2]: https://codeberg.org/jlmakiola/calendula/issues/2
+[#3]: https://codeberg.org/jlmakiola/calendula/issues/3
+[#4]: https://codeberg.org/jlmakiola/calendula/issues/4
+[#5]: https://codeberg.org/jlmakiola/calendula/issues/5
+[#6]: https://codeberg.org/jlmakiola/calendula/issues/6
+[#7]: https://codeberg.org/jlmakiola/calendula/issues/7
+[#8]: https://codeberg.org/jlmakiola/calendula/issues/8
+[#9]: https://codeberg.org/jlmakiola/calendula/issues/9
+[#10]: https://codeberg.org/jlmakiola/calendula/issues/10
+[#12]: https://codeberg.org/jlmakiola/calendula/issues/12
+[#13]: https://codeberg.org/jlmakiola/calendula/issues/13
+[#14]: https://codeberg.org/jlmakiola/calendula/issues/14
+[#15]: https://codeberg.org/jlmakiola/calendula/issues/15
+[#16]: https://codeberg.org/jlmakiola/calendula/issues/16
+[#17]: https://codeberg.org/jlmakiola/calendula/issues/17

README.md

@@ -15,6 +15,12 @@ Reads, writes, and reminds — on top of the system calendar, with zero network
 <a href="LICENSE"><img src="https://img.shields.io/badge/License-MIT-green" alt="MIT License"></a>
 </p>
 
+<p>
+<a href="https://f-droid.org/packages/de.jeanlucmakiola.calendula/"><img src="https://fdroid.gitlab.io/artwork/badge/get-it-on.png" alt="Get it on F-Droid" height="56"></a>
+&nbsp;
+<a href="https://ko-fi.com/jeanlucmakiola"><img src="https://storage.ko-fi.com/cdn/brandasset/v2/support_me_on_kofi_badge_beige.png" alt="Support me on Ko-fi" height="56"></a>
+</p>
+
 <p>
 <img src="fastlane/metadata/android/en-US/images/phoneScreenshots/01-week.png" width="19%" alt="Week view">&nbsp;
 <img src="fastlane/metadata/android/en-US/images/phoneScreenshots/02-month.png" width="19%" alt="Month view">&nbsp;
@@ -62,19 +68,27 @@ database, no sync stack reinvented.
 
 - Real Material 3 Expressive throughout — dynamic color (Android 12+),
   expressive motion and shapes, light/dark theme
-- German and English UI, per-app language setting
+- German and English UI, per-app language setting — and [open to community
+  translations](#-translations)
 - **Zero telemetry, zero analytics, no internet permission** — your data
   never leaves the device
 
 ## 📦 Install
 
-Calendula ships through a self-hosted F-Droid repository; every version tag
-is built, signed, and published there automatically.
+### F-Droid (recommended)
 
-1. Install an F-Droid client ([F-Droid](https://f-droid.org), Droid-ify, Neo
-   Store, …).
-2. Add the repository — open this link on your phone, or paste it under
-   *Settings → Repositories → Add*:
+Calendula is on the **official [F-Droid](https://f-droid.org) repository** —
+just search for **Calendula** in any F-Droid client, or
+[install it from f-droid.org](https://f-droid.org/packages/de.jeanlucmakiola.calendula/).
+
+### Self-hosted repo (latest builds)
+
+New versions are built, signed, and published to a self-hosted repository the
+moment each tag lands — usually a few days ahead of the official repo, which
+rebuilds on F-Droid's own schedule. Add it for the freshest builds:
+
+1. In your F-Droid client, open *Settings → Repositories → Add* (or open the
+   link below on your phone):
 
    ```
    https://apps.dev.jeanlucmakiola.de/dev/fdroid/repo?fingerprint=C2C0640402BF458FC0ED957AF0B37AA4C14022E72F89CE90B5965B458CF73425
@@ -84,36 +98,27 @@ is built, signed, and published there automatically.
    fingerprint (SHA-256):
    `C2C0 6404 02BF 458F C0ED 957A F0B3 7AA4 C140 22E7 2F89 CE90 B596 5B45 8CF7 3425`</sub>
 
-3. Refresh, search for **Calendula**, install. Updates arrive like any
-   other F-Droid app.
+2. Refresh, search for **Calendula**, install.
 
-Alternatively, build from source — see below.
+Both channels share the same signing key, so you can switch between them
+without reinstalling. Or build from source — see below.
 
-## 🛠 Building
+## 📚 Documentation
 
-Requires Android SDK 36+ and JDK 17. The Gradle wrapper is checked in:
+- **[Building from source](docs/BUILDING.md)** — requirements and Gradle tasks
+- **[Architecture](docs/ARCHITECTURE.md)** — the layered design and key pipelines
+- **[Roadmap](.planning/ROADMAP.md)** — what's shipped and what's next
 
-```bash
-./gradlew assembleDebug   # debug APK
-./gradlew test            # JVM unit tests
-./gradlew lint            # Android lint
-```
+## 🌍 Translations
 
-If your default JDK is not 17, set `JAVA_HOME` explicitly.
+Calendula ships in German and English, and you're warmly invited to add your
+language. Translations are managed on a self-hosted **Weblate**:
 
-## 🏗 Architecture
+**→ [Help translate Calendula](https://weblate.dev.jeanlucmakiola.de/engage/calendula/)**
 
-Single-activity Compose app, layered `UI → Repository → DataSource →
-CalendarContract`, observer-driven refresh, JVM-first tests. The full tour —
-including the recurring-write and reminder pipelines — lives in
-[docs/ARCHITECTURE.md](docs/ARCHITECTURE.md).
-
-## 🗺 Roadmap
-
-Shipped: read (v1.0), write (v1.1–v2.0), reminder delivery (v1.4).
-Next up: power-user features — widget, search, tablet layouts. The living
-roadmap is in [.planning/ROADMAP.md](.planning/ROADMAP.md), the release
-history in [CHANGELOG.md](CHANGELOG.md).
+No coding needed — register on the Weblate server, pick (or request) a language,
+and translate the strings in your browser. You can also reach this link in the
+app from the top of **Settings → App language**.
 
 ## 📜 License
 

app/build.gradle.kts

@@ -28,8 +28,8 @@ android {
         // which builds this version and then creates the matching vX.Y.Z tag +
         // release itself (versionCode is pinned to MAJOR*10000 + MINOR*100 +
         // PATCH from versionName, e.g. 2.7.2 -> 20702). See docs/RELEASING.md.
-        versionCode = 20900
-        versionName = "2.9.0"
+        versionCode = 21200
+        versionName = "2.12.0"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }
@@ -90,6 +90,8 @@ android {
 
     buildFeatures {
         compose = true
+        // BuildConfig.DEBUG gates the in-app debug ribbon (see DebugRibbon).
+        buildConfig = true
     }
 
     // Don't embed AGP's dependency-metadata block in the APK signing block. It's
@@ -152,6 +154,9 @@ dependencies {
 
     implementation(libs.androidx.datastore.preferences)
 
+    implementation(libs.androidx.work.runtime.ktx)
+    implementation(libs.androidx.documentfile)
+
     implementation(libs.androidx.glance.appwidget)
     implementation(libs.androidx.glance.material3)
 

app/src/debug/res/values/colors.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Debug-only launcher-icon background. Production is slate (#5C6B7A); the
+    debug build paints the adaptive-icon background burnt orange instead, so the
+    debug icon reads at a glance as "not the real app" on the home screen. The
+    off-white foreground mark contrasts on both. See drawable/ic_launcher_background.
+-->
+<resources>
+    <color name="ic_launcher_background">#FFB23B00</color>
+</resources>

app/src/debug/res/values/strings.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Debug-build resource overrides. Merged on top of src/main for the `debug`
+    build type only (release/releaseTest keep the production values), so the
+    debug app is unmistakable on the launcher: its own label, alongside the
+    real app thanks to the `.debug` applicationId suffix.
+-->
+<resources>
+    <string name="app_name">Calendula Debug</string>
+</resources>

app/src/main/AndroidManifest.xml

@@ -5,6 +5,15 @@
     <uses-permission android:name="android.permission.READ_CALENDAR" />
     <uses-permission android:name="android.permission.WRITE_CALENDAR" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <!--
+      Optional and feature-gated: only the "Contact special dates" feature reads
+      contacts, and only after the user enables it and grants this at runtime
+      (never requested at startup). Everything stays offline — birthdays and
+      other contact dates are mirrored one-way into local calendars; contacts
+      are never written and nothing leaves the device (the app has no INTERNET
+      permission). See docs/design/contact-special-dates.md.
+    -->
+    <uses-permission android:name="android.permission.READ_CONTACTS" />
     <!--
       Lets the "Reliable delivery" setting open the direct system dialog to
       exempt Calendula from battery optimisation (so reminder broadcasts aren't
@@ -59,6 +68,35 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
 
+            <!-- Be selectable as the system calendar app. Android has no API for
+                 an app to make itself the default, so registering the filters
+                 launchers and the OS use is what lets the user pick Calendula
+                 from the system chooser when a date action fires (issue #9).
+                 APP_CALENDAR is the "open the calendar app" action; the VIEW
+                 filters below catch a tapped date. -->
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.APP_CALENDAR" />
+            </intent-filter>
+            <!-- A launcher/clock date tap fires ACTION_VIEW on the provider's
+                 time Uri (content://com.android.calendar/time/<epochMillis>);
+                 some surfaces use the time/epoch mime type. We open the day view
+                 on that date (MainActivity.calendarTimeDateOrNull). -->
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <data
+                    android:scheme="content"
+                    android:host="com.android.calendar"
+                    android:pathPrefix="/time" />
+            </intent-filter>
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <data android:mimeType="time/epoch" />
+            </intent-filter>
+
             <!-- Open a .ics file (file manager / email attachment / browser). -->
             <intent-filter>
                 <action android:name="android.intent.action.VIEW" />

app/src/main/java/de/jeanlucmakiola/calendula/CalendulaApp.kt

@@ -1,8 +1,18 @@
 package de.jeanlucmakiola.calendula
 
 import android.app.Application
+import dagger.hilt.android.EntryPointAccessors
 import dagger.hilt.android.HiltAndroidApp
+import de.jeanlucmakiola.calendula.data.backup.BackupScheduler
+import de.jeanlucmakiola.calendula.data.backup.BackupWorker
+import de.jeanlucmakiola.calendula.data.contacts.SpecialDatesScheduler
+import de.jeanlucmakiola.calendula.data.contacts.SpecialDatesSyncWorker
 import de.jeanlucmakiola.calendula.data.crash.CrashReporter
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.launch
 
 /**
  * Application entry point. Registered as android:name=".CalendulaApp"
@@ -16,5 +26,42 @@ class CalendulaApp : Application() {
         // Install first thing so startup crashes are captured too (privacy-
         // respecting, on-device; the user submits the report by hand).
         CrashReporter.install(this)
+        reconcileAutoBackup()
+        reconcileSpecialDates()
+    }
+
+    /**
+     * Bring the scheduled auto-backup work back in line with the saved settings
+     * on every launch — re-arms it after a reinstall and, crucially, cancels any
+     * orphaned work once backup has been turned off.
+     */
+    private fun reconcileAutoBackup() {
+        val deps = EntryPointAccessors.fromApplication(this, BackupWorker.Deps::class.java)
+        CoroutineScope(SupervisorJob() + Dispatchers.Default).launch {
+            val prefs = deps.settingsPrefs()
+            BackupScheduler.apply(
+                context = this@CalendulaApp,
+                enabled = prefs.autoBackupEnabled.first(),
+                intervalMinutes = prefs.autoBackupIntervalMinutes.first(),
+                hasFolder = prefs.autoBackupFolderUri.first() != null,
+            )
+        }
+    }
+
+    /**
+     * Re-arm (or cancel) the daily special-dates reconcile from the saved
+     * settings on every launch — like [reconcileAutoBackup], this cancels
+     * orphaned work after the feature is turned off and re-schedules after a
+     * reinstall. The foreground trigger (RootScreen ON_RESUME) does the on-open
+     * refresh, so no immediate run is needed here.
+     */
+    private fun reconcileSpecialDates() {
+        val deps = EntryPointAccessors.fromApplication(this, SpecialDatesSyncWorker.Deps::class.java)
+        CoroutineScope(SupervisorJob() + Dispatchers.Default).launch {
+            SpecialDatesScheduler.apply(
+                context = this@CalendulaApp,
+                enabled = deps.settingsPrefs().specialDatesEnabled.first(),
+            )
+        }
     }
 }

app/src/main/java/de/jeanlucmakiola/calendula/MainActivity.kt

@@ -8,11 +8,15 @@ import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
 import androidx.appcompat.app.AppCompatActivity
 import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
 import androidx.core.content.IntentCompat
 import androidx.core.net.toUri
 import androidx.hilt.navigation.compose.hiltViewModel
@@ -20,15 +24,22 @@ import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import dagger.hilt.android.AndroidEntryPoint
 import de.jeanlucmakiola.calendula.data.crash.CrashReporter
 import de.jeanlucmakiola.calendula.data.prefs.ThemeMode
+import de.jeanlucmakiola.calendula.data.prefs.is24Hour
 import de.jeanlucmakiola.calendula.ui.RootScreen
+import de.jeanlucmakiola.calendula.ui.common.LocalShowHourLines
+import de.jeanlucmakiola.calendula.ui.common.LocalUse24HourFormat
 import de.jeanlucmakiola.calendula.ui.WidgetNavRequest
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
+import de.jeanlucmakiola.calendula.ui.common.DebugRibbon
 import de.jeanlucmakiola.calendula.ui.crash.CrashReportActivity
 import de.jeanlucmakiola.calendula.ui.crash.CrashReportDialog
 import de.jeanlucmakiola.calendula.ui.crash.submitCrashReport
 import de.jeanlucmakiola.calendula.ui.settings.SettingsViewModel
 import de.jeanlucmakiola.calendula.ui.theme.CalendulaTheme
 import kotlinx.datetime.LocalDate
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.toLocalDateTime
+import kotlin.time.Instant
 
 @AndroidEntryPoint
 class MainActivity : AppCompatActivity() {
@@ -81,19 +92,36 @@ class MainActivity : AppCompatActivity() {
                 ThemeMode.LIGHT -> false
                 ThemeMode.DARK -> true
             }
+            // The app-wide clock convention: the time-format preference resolved
+            // against the device's 24-hour system setting, provided once here so
+            // every time label reads it via LocalUse24HourFormat.
+            val context = LocalContext.current
+            val use24Hour = remember(settings.timeFormat, context) {
+                settings.timeFormat.is24Hour(android.text.format.DateFormat.is24HourFormat(context))
+            }
             CalendulaTheme(
                 darkTheme = darkTheme,
                 dynamicColor = settings.dynamicColor,
             ) {
-                RootScreen(
-                    modifier = Modifier.fillMaxSize(),
-                    requestedDetailKey = requestedDetailKey,
-                    onDetailKeyConsumed = { requestedDetailKey = null },
-                    widgetNavRequest = requestedNav,
-                    onWidgetNavConsumed = { requestedNav = null },
-                    requestedImportUri = requestedImportUri,
-                    onImportConsumed = { requestedImportUri = null },
-                )
+                Box(modifier = Modifier.fillMaxSize()) {
+                    CompositionLocalProvider(
+                        LocalUse24HourFormat provides use24Hour,
+                        LocalShowHourLines provides settings.showHourLines,
+                    ) {
+                        RootScreen(
+                            modifier = Modifier.fillMaxSize(),
+                            requestedDetailKey = requestedDetailKey,
+                            onDetailKeyConsumed = { requestedDetailKey = null },
+                            widgetNavRequest = requestedNav,
+                            onWidgetNavConsumed = { requestedNav = null },
+                            requestedImportUri = requestedImportUri,
+                            onImportConsumed = { requestedImportUri = null },
+                        )
+                    }
+                    // A persistent corner marker so a debug build is never
+                    // mistaken for the production app; compiled out of release.
+                    if (BuildConfig.DEBUG) DebugRibbon()
+                }
                 pendingCrashReport?.let { report ->
                     CrashReportDialog(
                         report = report,
@@ -138,10 +166,33 @@ class MainActivity : AppCompatActivity() {
             Intent.ACTION_SEND -> IntentCompat.getParcelableExtra(this, Intent.EXTRA_STREAM, Uri::class.java)
             else -> null
         } ?: return null
+        // The calendar "view time" Uri (a date tap) is also ACTION_VIEW/content;
+        // it's a navigation, not a file to import, so [navRequestOrNull] owns it.
+        if (uri.host == CALENDAR_PROVIDER_HOST) return null
         return uri.takeIf { it.scheme == "content" || it.scheme == "file" }
     }
 
+    /**
+     * The date a launcher/clock date tap points at, parsed from the AOSP calendar
+     * "view time" intent: ACTION_VIEW on `content://com.android.calendar/time/
+     * <epochMillis>`. Null for any other intent. The matching manifest filter is
+     * what lets users pick Calendula from the system calendar chooser (issue #9).
+     */
+    private fun Intent.calendarTimeDateOrNull(): LocalDate? {
+        if (action != Intent.ACTION_VIEW) return null
+        val uri = data ?: return null
+        if (uri.host != CALENDAR_PROVIDER_HOST) return null
+        val segments = uri.pathSegments
+        if (segments.firstOrNull() != "time") return null
+        val millis = segments.getOrNull(1)?.toLongOrNull() ?: return null
+        return Instant.fromEpochMilliseconds(millis)
+            .toLocalDateTime(TimeZone.currentSystemDefault()).date
+    }
+
     private fun Intent.navRequestOrNull(): WidgetNavRequest? {
+        // An external date tap (launcher/clock) has no widget source, so it opens
+        // the day view rooted over the default home view (OpenDate source = null).
+        calendarTimeDateOrNull()?.let { return WidgetNavRequest.OpenDate(it.toString(), source = null) }
         val source = sourceViewOrNull()
         val eventId = getLongExtra(EXTRA_EVENT_ID, -1L)
         return when {
@@ -183,6 +234,10 @@ class MainActivity : AppCompatActivity() {
     }
 
     companion object {
+        // The calendar provider's authority/host. A date tap arrives as
+        // ACTION_VIEW on content://com.android.calendar/time/<epochMillis>.
+        private const val CALENDAR_PROVIDER_HOST = "com.android.calendar"
+
         private const val EXTRA_EVENT_ID = "de.jeanlucmakiola.calendula.extra.EVENT_ID"
         private const val EXTRA_BEGIN_MILLIS = "de.jeanlucmakiola.calendula.extra.BEGIN"
         private const val EXTRA_END_MILLIS = "de.jeanlucmakiola.calendula.extra.END"

app/src/main/java/de/jeanlucmakiola/calendula/data/backup/AutoBackup.kt

@@ -0,0 +1,176 @@
+package de.jeanlucmakiola.calendula.data.backup
+
+import android.Manifest
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.PendingIntent
+import android.content.Context
+import android.content.pm.PackageManager
+import android.os.Build
+import android.util.Log
+import androidx.core.app.NotificationCompat
+import androidx.core.app.NotificationManagerCompat
+import androidx.core.content.ContextCompat
+import androidx.core.net.toUri
+import androidx.work.CoroutineWorker
+import androidx.work.ExistingPeriodicWorkPolicy
+import androidx.work.ExistingWorkPolicy
+import androidx.work.OneTimeWorkRequestBuilder
+import androidx.work.PeriodicWorkRequestBuilder
+import androidx.work.WorkManager
+import androidx.work.WorkerParameters
+import dagger.hilt.EntryPoint
+import dagger.hilt.InstallIn
+import dagger.hilt.android.EntryPointAccessors
+import dagger.hilt.components.SingletonComponent
+import de.jeanlucmakiola.calendula.R
+import de.jeanlucmakiola.calendula.data.calendar.CalendarRepository
+import de.jeanlucmakiola.calendula.data.ics.IcsExporter
+import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
+import de.jeanlucmakiola.calendula.domain.ics.IcsWriter
+import kotlinx.coroutines.flow.first
+import java.util.concurrent.TimeUnit
+import kotlin.time.Clock
+
+/**
+ * Schedules and runs the automatic periodic `.ics` backup of local calendars
+ * (issue #8). One-way export only — it mirrors the manual "Back up" into a
+ * user-chosen folder on an interval; it is not a sync. Stays INTERNET-free:
+ * everything is local provider reads + a local file write.
+ */
+object BackupScheduler {
+
+    private const val WORK_NAME = "auto-backup"
+    private const val WORK_NAME_NOW = "auto-backup-now"
+
+    /**
+     * Reconcile the scheduled work with the current settings: enqueue a unique
+     * periodic request when backup is on and a folder is set, otherwise cancel
+     * it. WorkManager persists the request across reboots on its own.
+     *
+     * The first run is delayed by one interval so it never overlaps an immediate
+     * [runNow] (two simultaneous writes would race and leave a "(1)" duplicate).
+     */
+    fun apply(context: Context, enabled: Boolean, intervalMinutes: Long, hasFolder: Boolean) {
+        val workManager = WorkManager.getInstance(context)
+        if (!enabled || !hasFolder) {
+            workManager.cancelUniqueWork(WORK_NAME)
+            // Also cancel any pending immediate run — otherwise a failing run-now
+            // keeps retrying after the user has turned backup off.
+            workManager.cancelUniqueWork(WORK_NAME_NOW)
+            return
+        }
+        // WorkManager's own floor is 15 min; the UI floors the user choice at 30.
+        val interval = intervalMinutes.coerceAtLeast(15L)
+        val request = PeriodicWorkRequestBuilder<BackupWorker>(interval, TimeUnit.MINUTES)
+            .setInitialDelay(interval, TimeUnit.MINUTES)
+            .build()
+        workManager.enqueueUniquePeriodicWork(
+            WORK_NAME,
+            ExistingPeriodicWorkPolicy.UPDATE,
+            request,
+        )
+    }
+
+    /**
+     * Run one export immediately (e.g. right after enabling or changing the
+     * folder) for instant feedback. Unique + REPLACE so rapid taps coalesce into
+     * a single run rather than racing each other.
+     */
+    fun runNow(context: Context) {
+        WorkManager.getInstance(context).enqueueUniqueWork(
+            WORK_NAME_NOW,
+            ExistingWorkPolicy.REPLACE,
+            OneTimeWorkRequestBuilder<BackupWorker>().build(),
+        )
+    }
+}
+
+/**
+ * Exports the local calendars to `calendula-backup.ics` in the configured folder,
+ * overwriting the previous file. Pulls its collaborators through a Hilt
+ * [EntryPoint] so it works under WorkManager's default (no-arg) worker factory —
+ * no custom factory / Application wiring needed. Records the outcome for the
+ * settings status line, and notifies after repeated failures.
+ */
+class BackupWorker(
+    appContext: Context,
+    params: WorkerParameters,
+) : CoroutineWorker(appContext, params) {
+
+    @EntryPoint
+    @InstallIn(SingletonComponent::class)
+    interface Deps {
+        fun settingsPrefs(): SettingsPrefs
+        fun repository(): CalendarRepository
+        fun exporter(): IcsExporter
+    }
+
+    override suspend fun doWork(): Result {
+        val deps = EntryPointAccessors.fromApplication(applicationContext, Deps::class.java)
+        val prefs = deps.settingsPrefs()
+        // Respect the toggle even for already-queued work: if backup was turned
+        // off, no-op (and don't retry) so a lingering run can't revive itself.
+        if (!prefs.autoBackupEnabled.first()) return Result.success()
+        val folder = prefs.autoBackupFolderUri.first()
+            ?: return Result.failure() // nothing to write to — leave scheduling to settings
+        val now = System.currentTimeMillis()
+        return try {
+            val events = deps.repository().exportEvents()
+            val content = IcsWriter().writeCalendar(events, Clock.System.now())
+            deps.exporter().writeToFolder(folder.toUri(), BACKUP_FILE_NAME, content)
+            prefs.recordAutoBackupRun(success = true, atMillis = now)
+            Result.success()
+        } catch (e: Exception) {
+            prefs.recordAutoBackupRun(success = false, atMillis = now)
+            if (prefs.autoBackupStatus.first().consecutiveFailures >= FAILURE_NOTIFY_THRESHOLD) {
+                notifyFailure(applicationContext)
+            }
+            Log.w(TAG, "Automatic backup failed", e)
+            Result.retry()
+        }
+    }
+
+    private fun notifyFailure(context: Context) {
+        val canPost = Build.VERSION.SDK_INT < Build.VERSION_CODES.TIRAMISU ||
+            ContextCompat.checkSelfPermission(context, Manifest.permission.POST_NOTIFICATIONS) ==
+            PackageManager.PERMISSION_GRANTED
+        if (!canPost) return
+        val manager = NotificationManagerCompat.from(context)
+        manager.createNotificationChannel(
+            NotificationChannel(
+                CHANNEL_ID,
+                context.getString(R.string.backup_channel_name),
+                NotificationManager.IMPORTANCE_LOW,
+            ).apply { description = context.getString(R.string.backup_channel_description) },
+        )
+        val launch = context.packageManager.getLaunchIntentForPackage(context.packageName)
+        val tap = launch?.let {
+            PendingIntent.getActivity(
+                context, 0, it,
+                PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE,
+            )
+        }
+        val notification = NotificationCompat.Builder(context, CHANNEL_ID)
+            .setSmallIcon(R.drawable.ic_notification)
+            .setContentTitle(context.getString(R.string.backup_failed_title))
+            .setContentText(context.getString(R.string.backup_failed_text))
+            .setCategory(NotificationCompat.CATEGORY_ERROR)
+            .setAutoCancel(true)
+            .apply { tap?.let(::setContentIntent) }
+            .build()
+        try {
+            manager.notify(NOTIFICATION_ID, notification)
+        } catch (e: SecurityException) {
+            Log.w(TAG, "Could not post backup-failure notification", e)
+        }
+    }
+
+    companion object {
+        const val BACKUP_FILE_NAME = "calendula-backup.ics"
+        private const val FAILURE_NOTIFY_THRESHOLD = 2
+        private const val CHANNEL_ID = "backup"
+        private const val NOTIFICATION_ID = 2
+        private const val TAG = "BackupWorker"
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/CalendarColorPalette.kt

@@ -0,0 +1,22 @@
+package de.jeanlucmakiola.calendula.data.calendar
+
+/**
+ * Google-Calendar-style palette; ARGB ints for a raw `CALENDAR_COLOR` /
+ * `EVENT_COLOR`. The named entries exist for callers that need one specific
+ * hue (the managed special-dates calendars), so they can't drift from the
+ * swatches offered in the colour picker.
+ */
+object CalendarColorPalette {
+    val Red = 0xFFD50000.toInt()
+    val Orange = 0xFFE67C00.toInt()
+    val Amber = 0xFFF6BF26.toInt()
+    val Green = 0xFF33B679.toInt()
+    val DarkGreen = 0xFF0B8043.toInt()
+    val Blue = 0xFF039BE5.toInt()
+    val Indigo = 0xFF3F51B5.toInt()
+    val Purple = 0xFF8E24AA.toInt()
+    val Graphite = 0xFF616161.toInt()
+
+    /** The full palette, in swatch-row order. */
+    val all: List<Int> = listOf(Red, Orange, Amber, Green, DarkGreen, Blue, Indigo, Purple, Graphite)
+}

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/CalendarDataSource.kt

@@ -24,10 +24,12 @@ import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventInstance
 import de.jeanlucmakiola.calendula.domain.EventStatus
 import de.jeanlucmakiola.calendula.domain.Reminder
+import de.jeanlucmakiola.calendula.domain.contacts.SpecialDateType
 import de.jeanlucmakiola.calendula.domain.ics.IcsEvent
 import de.jeanlucmakiola.calendula.domain.ics.ParsedIcsEvent
 import de.jeanlucmakiola.calendula.domain.rruleTruncatedAt
 import kotlinx.datetime.toJavaLocalDate
+import java.time.Instant
 import java.time.ZoneId
 import java.time.ZoneOffset
 import java.util.UUID
@@ -97,6 +99,54 @@ interface CalendarDataSource {
     /** Permanently delete a local calendar the app owns, with all its events. */
     fun deleteCalendar(id: Long)
 
+    /**
+     * Create a local calendar tagged as the special-dates mirror for [type]
+     * (a marker in `CAL_SYNC2`); returns its `Calendars._ID`. Otherwise a normal
+     * local calendar, so it inherits per-calendar colour/visibility/reminders.
+     */
+    fun createManagedCalendar(displayName: String, color: Int, type: SpecialDateType): Long
+
+    /**
+     * The app's special-dates calendars, found by their `CAL_SYNC2` marker.
+     * Lets the mirror re-adopt its calendars after the stored ids are lost, and
+     * detect when the user deleted one in system settings.
+     */
+    fun findManagedCalendars(): List<ManagedCalendarRow>
+
+    /**
+     * The managed events in [calendarId] (those carrying a `UID_2445`, not
+     * soft-deleted) as [ManagedEventRow]s — the existing side of the sync diff.
+     */
+    fun queryManagedEvents(calendarId: Long): List<ManagedEventRow>
+
+    /**
+     * Insert a managed event carrying the deterministic [uid] in `UID_2445`;
+     * seeds its reminder rows from [form] (never touched again by sync). Returns
+     * the new `Events._ID`. [allDayReminderTimeMinutes]: see [insertEvent].
+     */
+    fun insertManagedEvent(form: EventForm, uid: String, allDayReminderTimeMinutes: Int): Long
+
+    /**
+     * Overwrite exactly the given managed columns on [eventId] (keys are
+     * `CalendarContract.Events` columns; a null value clears the column). A
+     * bare, targeted update — it never reconciles reminders or attendees, so
+     * user-owned data on the event survives every sync. No-ops on an empty map.
+     */
+    fun updateManagedFields(eventId: Long, values: Map<String, Any?>)
+
+    /**
+     * Replace the reminders on **every** event in [calendarId] with [minutes]
+     * (all-day lead times), each encoded from its own date so it fires at
+     * [allDayReminderTimeMinutes]. Used by the special-dates section so a reminder
+     * change applies to existing events too, not just future ones — the managed
+     * calendars treat reminders as a calendar-level setting.
+     */
+    fun applyManagedCalendarReminders(
+        calendarId: Long,
+        allDayReminderTimeMinutes: Int,
+        minutes: List<Int>,
+    )
+
     /**
      * Insert a new event; returns the new `Events._ID`. [allDayReminderTimeMinutes]
      * (minutes from local midnight) is the wall-clock time all-day reminders
@@ -292,6 +342,128 @@ class AndroidCalendarDataSource @Inject constructor(
         if (deleted == 0) throw WriteFailedException("delete calendar id=$id")
     }
 
+    override fun createManagedCalendar(displayName: String, color: Int, type: SpecialDateType): Long {
+        val name = displayName.trim().ifEmpty { Fallbacks.UNNAMED_CALENDAR }
+        val values = ContentValues().apply {
+            put(CalendarContract.Calendars.ACCOUNT_NAME, LOCAL_ACCOUNT_NAME)
+            put(CalendarContract.Calendars.ACCOUNT_TYPE, CalendarContract.ACCOUNT_TYPE_LOCAL)
+            put(CalendarContract.Calendars.OWNER_ACCOUNT, LOCAL_ACCOUNT_NAME)
+            put(CalendarContract.Calendars.NAME, name)
+            put(CalendarContract.Calendars.CALENDAR_DISPLAY_NAME, name)
+            put(CalendarContract.Calendars.CALENDAR_COLOR, color)
+            put(
+                CalendarContract.Calendars.CALENDAR_ACCESS_LEVEL,
+                CalendarContract.Calendars.CAL_ACCESS_OWNER,
+            )
+            put(CalendarContract.Calendars.VISIBLE, 1)
+            put(CalendarContract.Calendars.SYNC_EVENTS, 1)
+            // The marker that identifies this as our special-dates calendar,
+            // independent of the (user-editable) display name. CAL_SYNC1 already
+            // holds the description, so the marker lives in CAL_SYNC2.
+            put(MANAGED_MARKER_COLUMN, markerFor(type))
+        }
+        val uri = resolver.insert(localCalendarsUri(), values)
+            ?: throw WriteFailedException("create managed calendar")
+        return ContentUris.parseId(uri)
+    }
+
+    override fun findManagedCalendars(): List<ManagedCalendarRow> = resolver.query(
+        CalendarContract.Calendars.CONTENT_URI,
+        arrayOf(CalendarContract.Calendars._ID, MANAGED_MARKER_COLUMN),
+        "${CalendarContract.Calendars.ACCOUNT_TYPE} = ? AND " +
+            "${CalendarContract.Calendars.ACCOUNT_NAME} = ? AND " +
+            "$MANAGED_MARKER_COLUMN IS NOT NULL",
+        arrayOf(CalendarContract.ACCOUNT_TYPE_LOCAL, LOCAL_ACCOUNT_NAME),
+        null,
+    )?.use { c ->
+        buildList {
+            while (c.moveToNext()) {
+                val type = typeForMarker(c.getString(1)) ?: continue
+                add(ManagedCalendarRow(id = c.getLong(0), type = type))
+            }
+        }
+    } ?: emptyList()
+
+    override fun queryManagedEvents(calendarId: Long): List<ManagedEventRow> = resolver.query(
+        CalendarContract.Events.CONTENT_URI,
+        arrayOf(
+            CalendarContract.Events._ID,
+            CalendarContract.Events.UID_2445,
+            CalendarContract.Events.TITLE,
+            CalendarContract.Events.DTSTART,
+            CalendarContract.Events.RRULE,
+        ),
+        "${CalendarContract.Events.CALENDAR_ID} = ? AND " +
+            "${CalendarContract.Events.DELETED} = 0 AND " +
+            "${CalendarContract.Events.UID_2445} IS NOT NULL",
+        arrayOf(calendarId.toString()),
+        null,
+    )?.use { c ->
+        buildList {
+            while (c.moveToNext()) {
+                val uid = c.getString(1)?.takeIf { it.isNotEmpty() } ?: continue
+                add(
+                    ManagedEventRow(
+                        eventId = c.getLong(0),
+                        uid = uid,
+                        title = c.getString(2).orEmpty(),
+                        dtStartMillis = c.getLong(3),
+                        rrule = c.getString(4)?.takeIf { it.isNotEmpty() },
+                    ),
+                )
+            }
+        }
+    } ?: emptyList()
+
+    override fun insertManagedEvent(form: EventForm, uid: String, allDayReminderTimeMinutes: Int): Long {
+        // Deterministic UID = the reconciliation key. A re-sync reads it back
+        // (queryManagedEvents) and diffs on it, so a contact never doubles.
+        val values = buildEventInsertValues(form, uid, form.toWriteTimes(ZoneId.systemDefault()))
+        val eventId = resolver.insert(CalendarContract.Events.CONTENT_URI, values.toContentValues())
+            ?.let(ContentUris::parseId)
+            ?: throw WriteFailedException("insert managed event into calendar id=${form.calendarId}")
+        // Seeded once, then never re-touched by sync — so a user who moves a
+        // birthday reminder keeps their change.
+        seedReminders(eventId, form, allDayReminderTimeMinutes)
+        return eventId
+    }
+
+    override fun updateManagedFields(eventId: Long, values: Map<String, Any?>) {
+        if (values.isEmpty()) return
+        val rows = resolver.update(
+            ContentUris.withAppendedId(CalendarContract.Events.CONTENT_URI, eventId),
+            values.toContentValues(),
+            null, null,
+        )
+        if (rows == 0) throw WriteFailedException("update managed event id=$eventId")
+    }
+
+    override fun applyManagedCalendarReminders(
+        calendarId: Long,
+        allDayReminderTimeMinutes: Int,
+        minutes: List<Int>,
+    ) {
+        val zone = ZoneId.systemDefault()
+        resolver.query(
+            CalendarContract.Events.CONTENT_URI,
+            arrayOf(CalendarContract.Events._ID, CalendarContract.Events.DTSTART),
+            "${CalendarContract.Events.CALENDAR_ID} = ? AND ${CalendarContract.Events.DELETED} = 0",
+            arrayOf(calendarId.toString()),
+            null,
+        )?.use { c ->
+            while (c.moveToNext()) {
+                val eventId = c.getLong(0)
+                // Managed events are all-day: DTSTART is a UTC midnight.
+                val startDate = Instant.ofEpochMilli(c.getLong(1))
+                    .atZone(ZoneOffset.UTC).toLocalDate()
+                val encoded = minutes
+                    .map { toProviderAllDayMinutes(it, startDate, zone, allDayReminderTimeMinutes) }
+                    .distinct()
+                reconcileReminders(eventId, encoded)
+            }
+        }
+    }
+
     override fun instances(beginMillis: Long, endMillis: Long): List<EventInstance> {
         ensureObserversRegistered()
         val uri = CalendarContract.Instances.CONTENT_URI.buildUpon().apply {
@@ -575,35 +747,15 @@ class AndroidCalendarDataSource @Inject constructor(
             .distinct()
 
     override fun insertEvent(form: EventForm, allDayReminderTimeMinutes: Int): Long {
-        val times = form.toWriteTimes(ZoneId.systemDefault())
-        val values = ContentValues().apply {
-            put(
-                CalendarContract.Events.CALENDAR_ID,
-                requireNotNull(form.calendarId) { "EventForm.calendarId is required" },
-            )
-            // A globally-unique UID so a later .ics backup/restore can identify
-            // the event and not duplicate it on re-import (the provider leaves
-            // this null for events it didn't sync). Older rows without one fall
-            // back to a stable synthesised UID at export time (deriveIcsUid).
-            put(CalendarContract.Events.UID_2445, "${UUID.randomUUID()}@calendula")
-            put(CalendarContract.Events.TITLE, form.title.trim())
-            put(CalendarContract.Events.ALL_DAY, if (form.isAllDay) 1 else 0)
-            put(CalendarContract.Events.DTSTART, times.dtStartMillis)
-            // The provider's invariant: recurring rows carry RRULE+DURATION
-            // (and no DTEND), one-off rows carry DTEND.
-            if (form.rrule == null) {
-                put(CalendarContract.Events.DTEND, times.dtEndMillis)
-            } else {
-                put(CalendarContract.Events.RRULE, form.rrule)
-                put(CalendarContract.Events.DURATION, times.toRfc2445Duration(form.isAllDay))
-            }
-            put(CalendarContract.Events.EVENT_TIMEZONE, times.timezone)
-            put(CalendarContract.Events.AVAILABILITY, form.availability.toProviderValue())
-            put(CalendarContract.Events.ACCESS_LEVEL, form.accessLevel.toProviderValue())
-            form.location.trim().takeIf { it.isNotEmpty() }
-                ?.let { put(CalendarContract.Events.EVENT_LOCATION, it) }
-            form.description.trim().takeIf { it.isNotEmpty() }
-                ?.let { put(CalendarContract.Events.DESCRIPTION, it) }
+        // A globally-unique UID so a later .ics backup/restore can identify
+        // the event and not duplicate it on re-import (the provider leaves
+        // this null for events it didn't sync). Older rows without one fall
+        // back to a stable synthesised UID at export time (deriveIcsUid).
+        val values = buildEventInsertValues(
+            form,
+            uid = "${UUID.randomUUID()}@calendula",
+            times = form.toWriteTimes(ZoneId.systemDefault()),
+        ).toContentValues().apply {
             // A null colour just leaves both columns unset (the event inherits
             // its calendar's colour), so only the key/raw cases are written.
             when {
@@ -615,19 +767,7 @@ class AndroidCalendarDataSource @Inject constructor(
         val uri = resolver.insert(CalendarContract.Events.CONTENT_URI, values)
             ?: throw WriteFailedException("insert event into calendar id=${form.calendarId}")
         val eventId = ContentUris.parseId(uri)
-        // Best effort (spec §8): the event exists at this point — a reminder
-        // that fails to attach is logged, not surfaced as a failed create.
-        encodedReminders(form, allDayReminderTimeMinutes)
-            .forEach { minutes ->
-                val reminder = ContentValues().apply {
-                    put(CalendarContract.Reminders.EVENT_ID, eventId)
-                    put(CalendarContract.Reminders.MINUTES, minutes)
-                    put(CalendarContract.Reminders.METHOD, CalendarContract.Reminders.METHOD_ALERT)
-                }
-                if (resolver.insert(CalendarContract.Reminders.CONTENT_URI, reminder) == null) {
-                    Log.w(TAG, "Failed to attach reminder ($minutes min) to event $eventId")
-                }
-            }
+        seedReminders(eventId, form, allDayReminderTimeMinutes)
         // Guests are best-effort like reminders: a row that fails to attach is
         // logged, not surfaced as a failed create. Calendula never sends an
         // invitation — it only writes the rows; the backend decides delivery.
@@ -635,6 +775,24 @@ class AndroidCalendarDataSource @Inject constructor(
         return eventId
     }
 
+    /**
+     * Attach [form]'s reminders to a freshly inserted event. Best effort
+     * (spec §8): the event exists at this point — a reminder that fails to
+     * attach is logged, not surfaced as a failed create.
+     */
+    private fun seedReminders(eventId: Long, form: EventForm, allDayReminderTimeMinutes: Int) {
+        encodedReminders(form, allDayReminderTimeMinutes).forEach { minutes ->
+            val reminder = ContentValues().apply {
+                put(CalendarContract.Reminders.EVENT_ID, eventId)
+                put(CalendarContract.Reminders.MINUTES, minutes)
+                put(CalendarContract.Reminders.METHOD, CalendarContract.Reminders.METHOD_ALERT)
+            }
+            if (resolver.insert(CalendarContract.Reminders.CONTENT_URI, reminder) == null) {
+                Log.w(TAG, "Failed to attach reminder ($minutes min) to event $eventId")
+            }
+        }
+    }
+
     override fun updateEvent(
         eventId: Long,
         original: EventForm,
@@ -1038,6 +1196,17 @@ class AndroidCalendarDataSource @Inject constructor(
         while (moveToNext()) mapper(this@mapAllNotNull)?.let(::add)
     }
 
+    /** The `CAL_SYNC2` marker value identifying a managed calendar's [type]. */
+    private fun markerFor(type: SpecialDateType): String = when (type) {
+        SpecialDateType.Birthday -> "$MANAGED_MARKER_PREFIX:birthday"
+        SpecialDateType.Anniversary -> "$MANAGED_MARKER_PREFIX:anniversary"
+        SpecialDateType.Custom -> "$MANAGED_MARKER_PREFIX:custom"
+    }
+
+    /** Inverse of [markerFor]; null for a value that isn't one of ours. */
+    private fun typeForMarker(marker: String?): SpecialDateType? =
+        SpecialDateType.entries.firstOrNull { markerFor(it) == marker }
+
     private companion object {
         const val TAG = "CalendarDataSource"
 
@@ -1047,6 +1216,13 @@ class AndroidCalendarDataSource @Inject constructor(
          */
         const val LOCAL_ACCOUNT_NAME = "Calendula"
 
+        /**
+         * Column and namespace for the special-dates marker. CAL_SYNC1 already
+         * holds the local-calendar description, so the marker uses CAL_SYNC2.
+         */
+        val MANAGED_MARKER_COLUMN: String = CalendarContract.Calendars.CAL_SYNC2
+        const val MANAGED_MARKER_PREFIX = "calendula.specialdates"
+
         /**
          * How far ahead/behind a search looks for a recurring event's nearest
          * occurrence (~2 years). Wide enough for everyday series; a series that

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/CalendarRepositoryImpl.kt

@@ -14,6 +14,7 @@ import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.distinctUntilChanged
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.flow.flowOn
@@ -55,11 +56,12 @@ class CalendarRepositoryImpl @Inject constructor(
             .reQuery { dataSource.calendars() }
             .flowOn(io)
 
-    // Instances are filtered by the app-side hidden-calendar set (M3): an event
-    // is dropped whenever the user has hidden its calendar. Re-runs when the
-    // provider ticks *or* the hidden set changes — toggling a calendar in the
-    // filter sheet updates every view immediately. [calendars] stays unfiltered
-    // so the filter sheet can list and re-enable hidden calendars.
+    // Instances are filtered by the app-side hidden ∪ disabled calendar sets
+    // (M3): an event is dropped whenever the user has hidden *or* disabled its
+    // calendar. Re-runs when the provider ticks *or* either set changes —
+    // toggling a calendar in the filter sheet or the calendar manager updates
+    // every view immediately. [calendars] stays unfiltered so those screens can
+    // list and re-enable hidden/disabled calendars.
     override fun instances(range: ClosedRange<Instant>): Flow<List<EventInstance>> =
         combine(
             ticks
@@ -71,10 +73,17 @@ class CalendarRepositoryImpl @Inject constructor(
                     )
                 },
             prefs.hiddenCalendarIds,
-        ) { instances, hidden ->
-            if (hidden.isEmpty()) instances
-            else instances.filterNot { it.calendarId in hidden }
-        }.flowOn(io)
+            prefs.disabledCalendarIds,
+        ) { instances, hidden, disabled ->
+            val excluded = hidden + disabled
+            if (excluded.isEmpty()) instances
+            else instances.filterNot { it.calendarId in excluded }
+        }
+            // hidden and disabled both derive from one DataStore, so toggling
+            // either makes both re-emit and combine briefly surfaces the same
+            // list twice — collapse the duplicate so views don't re-render for it.
+            .distinctUntilChanged()
+            .flowOn(io)
 
     override suspend fun eventDetail(eventId: Long): EventDetail = withContext(io) {
         dataSource.eventDetail(eventId) ?: throw NoSuchEventException(eventId)
@@ -82,9 +91,9 @@ class CalendarRepositoryImpl @Inject constructor(
 
     override suspend fun searchEvents(query: String): List<EventInstance> = withContext(io) {
         if (query.isBlank()) return@withContext emptyList()
-        val hidden = prefs.hiddenCalendarIds.first()
+        val excluded = prefs.hiddenCalendarIds.first() + prefs.disabledCalendarIds.first()
         dataSource.searchEvents(query)
-            .let { if (hidden.isEmpty()) it else it.filterNot { e -> e.calendarId in hidden } }
+            .let { if (excluded.isEmpty()) it else it.filterNot { e -> e.calendarId in excluded } }
     }
 
     override suspend fun eventColorPalette(calendarId: Long): List<EventColorOption> =

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/EventWriteMapper.kt

@@ -49,6 +49,42 @@ internal fun EventWriteTimes.toRfc2445Duration(isAllDay: Boolean): String = if (
     "P${(dtEndMillis - dtStartMillis) / 1_000L}S"
 }
 
+/**
+ * Column values for a brand-new Events row: identity, times (the provider's
+ * invariant — recurring rows carry RRULE+DURATION and no DTEND, one-off rows
+ * carry DTEND), availability/access level and trimmed optional text. Shared by
+ * the user-event and managed-event insert paths, which differ only in the
+ * [uid] they stamp; colour and attendees are user-event concerns the caller
+ * layers on top.
+ */
+internal fun buildEventInsertValues(
+    form: EventForm,
+    uid: String,
+    times: EventWriteTimes,
+): Map<String, Any?> = buildMap {
+    put(
+        CalendarContract.Events.CALENDAR_ID,
+        requireNotNull(form.calendarId) { "EventForm.calendarId is required" },
+    )
+    put(CalendarContract.Events.UID_2445, uid)
+    put(CalendarContract.Events.TITLE, form.title.trim())
+    put(CalendarContract.Events.ALL_DAY, if (form.isAllDay) 1 else 0)
+    put(CalendarContract.Events.DTSTART, times.dtStartMillis)
+    if (form.rrule == null) {
+        put(CalendarContract.Events.DTEND, times.dtEndMillis)
+    } else {
+        put(CalendarContract.Events.RRULE, form.rrule)
+        put(CalendarContract.Events.DURATION, times.toRfc2445Duration(form.isAllDay))
+    }
+    put(CalendarContract.Events.EVENT_TIMEZONE, times.timezone)
+    put(CalendarContract.Events.AVAILABILITY, form.availability.toProviderValue())
+    put(CalendarContract.Events.ACCESS_LEVEL, form.accessLevel.toProviderValue())
+    form.location.trim().takeIf { it.isNotEmpty() }
+        ?.let { put(CalendarContract.Events.EVENT_LOCATION, it) }
+    form.description.trim().takeIf { it.isNotEmpty() }
+        ?.let { put(CalendarContract.Events.DESCRIPTION, it) }
+}
+
 /**
  * Dirty-checked column values for updating an existing Events row: only what
  * the user actually changed is written, so untouched fields can't stomp
@@ -118,8 +154,14 @@ internal fun buildEventUpdateValues(
  * provider clone the series row and apply these on top. Unlike the series
  * update there is no dirty check — the exception is a fresh row, so every
  * form-backed column is written (empty optionals as explicit NULLs, since the
- * clone starts from the parent's values). An exception is a single event:
- * DTEND, never RRULE/DURATION.
+ * clone starts from the parent's values).
+ *
+ * The occurrence's length travels as DURATION, never DTEND: the provider
+ * rejects DTEND on an exception outright (`CalendarProvider2`:
+ * "Exceptions can't overwrite dtend") and derives the instance end from
+ * DTSTART + DURATION itself, clearing the inherited RRULE in the process. This
+ * matches how AOSP Calendar/Etar write exceptions; sending DTEND is what made
+ * "only this event" fail on-device (Codeberg #16).
  */
 internal fun buildOccurrenceExceptionValues(
     form: EventForm,
@@ -131,7 +173,7 @@ internal fun buildOccurrenceExceptionValues(
     put(CalendarContract.Events.TITLE, form.title.trim())
     put(CalendarContract.Events.ALL_DAY, if (form.isAllDay) 1 else 0)
     put(CalendarContract.Events.DTSTART, times.dtStartMillis)
-    put(CalendarContract.Events.DTEND, times.dtEndMillis)
+    put(CalendarContract.Events.DURATION, times.toRfc2445Duration(form.isAllDay))
     put(CalendarContract.Events.EVENT_TIMEZONE, times.timezone)
     put(CalendarContract.Events.AVAILABILITY, form.availability.toProviderValue())
     put(CalendarContract.Events.ACCESS_LEVEL, form.accessLevel.toProviderValue())

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/ManagedCalendar.kt

@@ -0,0 +1,24 @@
+package de.jeanlucmakiola.calendula.data.calendar
+
+import de.jeanlucmakiola.calendula.domain.contacts.SpecialDateType
+
+/**
+ * One of the app's special-dates calendars, discovered by the marker stamped in
+ * its `CAL_SYNC2` column — so the mirror can re-adopt its calendars even if the
+ * stored ids in preferences were lost (e.g. an app-data wipe).
+ */
+data class ManagedCalendarRow(val id: Long, val type: SpecialDateType)
+
+/**
+ * A managed event as read back for the sync diff. [uid] is the deterministic
+ * `Events.UID_2445` (`contact-<type>:<lookupKey>@calendula`) the mirror keys on;
+ * [title], [dtStartMillis] and [rrule] are the managed columns compared against
+ * the desired state to decide whether a targeted update is needed.
+ */
+data class ManagedEventRow(
+    val eventId: Long,
+    val uid: String,
+    val title: String,
+    val dtStartMillis: Long,
+    val rrule: String?,
+)

app/src/main/java/de/jeanlucmakiola/calendula/data/contacts/AndroidSpecialDatesCalendarSpec.kt

@@ -0,0 +1,42 @@
+package de.jeanlucmakiola.calendula.data.contacts
+
+import android.content.Context
+import dagger.hilt.android.qualifiers.ApplicationContext
+import de.jeanlucmakiola.calendula.R
+import de.jeanlucmakiola.calendula.data.calendar.CalendarColorPalette
+import de.jeanlucmakiola.calendula.domain.contacts.SpecialDateType
+import javax.inject.Inject
+import javax.inject.Singleton
+
+/**
+ * Resolves the localized calendar names/templates and per-type colours the
+ * mirror creates its calendars with. The colours are picked from the shared
+ * palette so managed calendars look native alongside user calendars.
+ */
+@Singleton
+class AndroidSpecialDatesCalendarSpec @Inject constructor(
+    @ApplicationContext private val context: Context,
+) : SpecialDatesCalendarSpec {
+
+    override fun displayName(type: SpecialDateType): String = context.getString(
+        when (type) {
+            SpecialDateType.Birthday -> R.string.special_dates_calendar_birthday
+            SpecialDateType.Anniversary -> R.string.special_dates_calendar_anniversary
+            SpecialDateType.Custom -> R.string.special_dates_calendar_custom
+        },
+    )
+
+    override fun defaultTitleTemplate(type: SpecialDateType): String = context.getString(
+        when (type) {
+            SpecialDateType.Birthday -> R.string.special_dates_default_title_birthday
+            SpecialDateType.Anniversary -> R.string.special_dates_default_title_anniversary
+            SpecialDateType.Custom -> R.string.special_dates_default_title_custom
+        },
+    )
+
+    override fun color(type: SpecialDateType): Int = when (type) {
+        SpecialDateType.Birthday -> CalendarColorPalette.Purple
+        SpecialDateType.Anniversary -> CalendarColorPalette.Red
+        SpecialDateType.Custom -> CalendarColorPalette.Blue
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/data/contacts/ContactSpecialDatesDataSource.kt

@@ -0,0 +1,101 @@
+package de.jeanlucmakiola.calendula.data.contacts
+
+import android.Manifest
+import android.content.Context
+import android.content.pm.PackageManager
+import android.provider.ContactsContract
+import android.provider.ContactsContract.CommonDataKinds.Event
+import android.util.Log
+import androidx.core.content.ContextCompat
+import dagger.hilt.android.qualifiers.ApplicationContext
+import de.jeanlucmakiola.calendula.domain.contacts.ContactSpecialDate
+import de.jeanlucmakiola.calendula.domain.contacts.SpecialDateType
+import de.jeanlucmakiola.calendula.domain.contacts.parseContactEventDate
+import javax.inject.Inject
+import javax.inject.Singleton
+
+/**
+ * Reads the dated `Event` rows (birthdays, anniversaries, custom dates) of the
+ * device's contacts. Read-only and offline — the one-way source for the
+ * special-dates mirror. Requires `READ_CONTACTS`; returns an empty list when
+ * the permission is absent so the sync can degrade to a stalled state rather
+ * than crash.
+ */
+interface ContactSpecialDatesDataSource {
+    fun hasPermission(): Boolean
+
+    /** All usable contact special-dates, deduplicated per contact and type. */
+    fun readSpecialDates(): List<ContactSpecialDate>
+}
+
+/** Whether `READ_CONTACTS` is granted — the gate for every contacts read. */
+fun Context.hasContactsPermission(): Boolean =
+    ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS) ==
+        PackageManager.PERMISSION_GRANTED
+
+/** Map a `ContactsContract` event `TYPE` to our calendar bucket. */
+internal fun specialDateTypeForRawEventType(type: Int): SpecialDateType = when (type) {
+    Event.TYPE_BIRTHDAY -> SpecialDateType.Birthday
+    Event.TYPE_ANNIVERSARY -> SpecialDateType.Anniversary
+    else -> SpecialDateType.Custom
+}
+
+@Singleton
+class AndroidContactSpecialDatesDataSource @Inject constructor(
+    @ApplicationContext private val context: Context,
+) : ContactSpecialDatesDataSource {
+
+    override fun hasPermission(): Boolean = context.hasContactsPermission()
+
+    override fun readSpecialDates(): List<ContactSpecialDate> {
+        if (!hasPermission()) return emptyList()
+        val resolver = context.contentResolver
+        // A contact can carry the same date more than once (multiple raw
+        // contacts under one aggregate); keep the first per (contact, type).
+        val seen = HashSet<Pair<String, SpecialDateType>>()
+        val result = ArrayList<ContactSpecialDate>()
+        runCatching {
+            resolver.query(
+                ContactsContract.Data.CONTENT_URI,
+                PROJECTION,
+                "${ContactsContract.Data.MIMETYPE} = ?",
+                arrayOf(Event.CONTENT_ITEM_TYPE),
+                null,
+            )?.use { c ->
+                val idxDate = c.getColumnIndexOrThrow(Event.START_DATE)
+                val idxType = c.getColumnIndexOrThrow(Event.TYPE)
+                val idxLabel = c.getColumnIndexOrThrow(Event.LABEL)
+                val idxLookup = c.getColumnIndexOrThrow(ContactsContract.Data.LOOKUP_KEY)
+                val idxName = c.getColumnIndexOrThrow(ContactsContract.Data.DISPLAY_NAME_PRIMARY)
+                while (c.moveToNext()) {
+                    val lookup = c.getString(idxLookup)?.takeIf { it.isNotEmpty() } ?: continue
+                    val parts = parseContactEventDate(c.getString(idxDate)) ?: continue
+                    val type = specialDateTypeForRawEventType(c.getInt(idxType))
+                    if (!seen.add(lookup to type)) continue
+                    result += ContactSpecialDate(
+                        lookupKey = lookup,
+                        displayName = c.getString(idxName)?.trim().orEmpty(),
+                        type = type,
+                        month = parts.month,
+                        day = parts.day,
+                        year = parts.year,
+                        label = c.getString(idxLabel)?.takeIf { it.isNotBlank() },
+                    )
+                }
+            }
+        }.onFailure { Log.w(TAG, "Reading contact special-dates failed", it) }
+        return result
+    }
+
+    private companion object {
+        const val TAG = "ContactSpecialDates"
+
+        val PROJECTION = arrayOf(
+            ContactsContract.Data.LOOKUP_KEY,
+            ContactsContract.Data.DISPLAY_NAME_PRIMARY,
+            Event.START_DATE,
+            Event.TYPE,
+            Event.LABEL,
+        )
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/data/contacts/SpecialDatesScheduler.kt

@@ -0,0 +1,122 @@
+package de.jeanlucmakiola.calendula.data.contacts
+
+import android.content.Context
+import android.util.Log
+import androidx.work.CoroutineWorker
+import androidx.work.Data
+import androidx.work.ExistingPeriodicWorkPolicy
+import androidx.work.ExistingWorkPolicy
+import androidx.work.OneTimeWorkRequestBuilder
+import androidx.work.PeriodicWorkRequestBuilder
+import androidx.work.WorkManager
+import androidx.work.WorkerParameters
+import dagger.hilt.EntryPoint
+import dagger.hilt.InstallIn
+import dagger.hilt.android.EntryPointAccessors
+import dagger.hilt.components.SingletonComponent
+import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
+import de.jeanlucmakiola.calendula.data.prefs.SpecialDatesStalledReason
+import kotlinx.coroutines.flow.first
+import java.util.concurrent.TimeUnit
+
+/**
+ * Schedules the contact special-dates mirror. Birthdays change rarely, so this
+ * is deliberately cheap: a **daily** periodic reconcile, plus an immediate run
+ * on enable / "Sync now" and a debounced one when the app is foregrounded. No
+ * ContentObserver — it would need the process alive and buys almost nothing for
+ * once-a-year events. Everything stays offline (local contacts → local calendar).
+ */
+object SpecialDatesScheduler {
+
+    private const val WORK_NAME = "special-dates-sync"
+    private const val WORK_NAME_NOW = "special-dates-sync-now"
+    private const val KEY_FOREGROUND = "foreground"
+
+    /** Enqueue (or cancel) the daily periodic reconcile to match [enabled]. */
+    fun apply(context: Context, enabled: Boolean) {
+        val workManager = WorkManager.getInstance(context)
+        if (!enabled) {
+            workManager.cancelUniqueWork(WORK_NAME)
+            workManager.cancelUniqueWork(WORK_NAME_NOW)
+            return
+        }
+        val request = PeriodicWorkRequestBuilder<SpecialDatesSyncWorker>(1, TimeUnit.DAYS)
+            // Delay the first periodic run so it never overlaps an immediate run.
+            .setInitialDelay(1, TimeUnit.DAYS)
+            .build()
+        workManager.enqueueUniquePeriodicWork(WORK_NAME, ExistingPeriodicWorkPolicy.UPDATE, request)
+    }
+
+    /**
+     * Run one reconcile immediately. [foreground] runs are debounced (the app can
+     * resume often); enable/"Sync now" runs ([foreground] false) always sync.
+     */
+    fun runNow(context: Context, foreground: Boolean = false) {
+        val request = OneTimeWorkRequestBuilder<SpecialDatesSyncWorker>()
+            .setInputData(Data.Builder().putBoolean(KEY_FOREGROUND, foreground).build())
+            .build()
+        WorkManager.getInstance(context)
+            .enqueueUniqueWork(WORK_NAME_NOW, ExistingWorkPolicy.REPLACE, request)
+    }
+
+    internal const val INPUT_FOREGROUND = KEY_FOREGROUND
+}
+
+/**
+ * Runs the [SpecialDatesSyncEngine]. Pulls its collaborators through a Hilt
+ * [EntryPoint] so it works under WorkManager's default worker factory. Records
+ * the run for the settings status line; a missing permission parks the feature
+ * in a stalled state (surfaced in settings) rather than retrying forever.
+ */
+class SpecialDatesSyncWorker(
+    appContext: Context,
+    params: WorkerParameters,
+) : CoroutineWorker(appContext, params) {
+
+    @EntryPoint
+    @InstallIn(SingletonComponent::class)
+    interface Deps {
+        fun settingsPrefs(): SettingsPrefs
+        fun syncEngine(): SpecialDatesSyncEngine
+    }
+
+    override suspend fun doWork(): Result {
+        val deps = EntryPointAccessors.fromApplication(applicationContext, Deps::class.java)
+        val prefs = deps.settingsPrefs()
+
+        val now = System.currentTimeMillis()
+        // A foreground resume can fire often — skip if we synced recently.
+        val foreground = inputData.getBoolean(SpecialDatesScheduler.INPUT_FOREGROUND, false)
+        if (foreground && now - prefs.specialDatesLastForegroundSync.first() < FOREGROUND_DEBOUNCE_MILLIS) {
+            return Result.success()
+        }
+
+        return try {
+            when (val result = deps.syncEngine().sync()) {
+                // The engine re-checks the toggle, so already-queued work never
+                // revives a disabled feature; don't record a run either.
+                SpecialDatesSyncResult.Disabled -> return Result.success()
+                else -> {
+                    val stalled = if (result == SpecialDatesSyncResult.PermissionMissing) {
+                        SpecialDatesStalledReason.PermissionRevoked
+                    } else {
+                        null
+                    }
+                    prefs.recordSpecialDatesRun(now, stalled)
+                }
+            }
+            if (foreground) prefs.setSpecialDatesLastForegroundSync(now)
+            Result.success()
+        } catch (e: Exception) {
+            Log.w(TAG, "Special-dates sync failed", e)
+            Result.retry()
+        }
+    }
+
+    companion object {
+        private const val TAG = "SpecialDatesSync"
+
+        /** Skip a foreground-triggered sync if one ran within this window (4h). */
+        private const val FOREGROUND_DEBOUNCE_MILLIS = 4L * 60 * 60 * 1000
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/data/contacts/SpecialDatesSyncEngine.kt

@@ -0,0 +1,294 @@
+package de.jeanlucmakiola.calendula.data.contacts
+
+import android.provider.CalendarContract
+import de.jeanlucmakiola.calendula.data.calendar.CalendarDataSource
+import de.jeanlucmakiola.calendula.data.calendar.ManagedEventRow
+import de.jeanlucmakiola.calendula.data.calendar.toWriteTimes
+import de.jeanlucmakiola.calendula.data.prefs.CalendarReminderOverride
+import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
+import de.jeanlucmakiola.calendula.domain.Availability
+import de.jeanlucmakiola.calendula.domain.EventForm
+import de.jeanlucmakiola.calendula.domain.RecurrenceFreq
+import de.jeanlucmakiola.calendula.domain.SimpleRecurrence
+import de.jeanlucmakiola.calendula.domain.contacts.ContactSpecialDate
+import de.jeanlucmakiola.calendula.domain.contacts.SpecialDateType
+import de.jeanlucmakiola.calendula.domain.contacts.anchorDate
+import de.jeanlucmakiola.calendula.domain.contacts.managedEventUid
+import de.jeanlucmakiola.calendula.domain.contacts.renderSpecialDateTitle
+import de.jeanlucmakiola.calendula.domain.toRRule
+import kotlinx.coroutines.flow.first
+import kotlinx.datetime.LocalDateTime
+import kotlinx.datetime.LocalTime
+import java.time.ZoneId
+import javax.inject.Inject
+import javax.inject.Singleton
+
+/** Outcome of one mirror reconcile, reported back so the worker can record status. */
+enum class SpecialDatesSyncResult { Success, Disabled, PermissionMissing }
+
+/**
+ * Localized, per-type presentation the engine needs but can't derive purely
+ * (calendar display name, colour, and the default title template). Kept behind
+ * an interface so the engine's diff stays unit-testable without Android
+ * resources.
+ */
+interface SpecialDatesCalendarSpec {
+    fun displayName(type: SpecialDateType): String
+    fun color(type: SpecialDateType): Int
+    fun defaultTitleTemplate(type: SpecialDateType): String
+}
+
+/**
+ * The stored title template for [type], falling back to the localized default
+ * when blank/absent — the one resolution rule shared by the sync (what gets
+ * written) and the settings editor (what gets shown).
+ */
+fun SpecialDatesCalendarSpec.resolveTitleTemplate(
+    type: SpecialDateType,
+    stored: Map<SpecialDateType, String>,
+): String = stored[type]?.takeIf { it.isNotBlank() } ?: defaultTitleTemplate(type)
+
+/**
+ * Mirrors contact birthdays/anniversaries/custom dates into local calendars,
+ * one per type. Every reconcile is an idempotent diff keyed on the deterministic
+ * `UID_2445` ([managedEventUid]): new contacts are inserted (seeding user-owned
+ * fields once), changed contacts get a *targeted* managed-column update, and
+ * removed contacts are deleted — so a user's own edits (reminders, location,
+ * notes) are never clobbered. See docs/design/contact-special-dates.md.
+ */
+@Singleton
+class SpecialDatesSyncEngine @Inject constructor(
+    private val contacts: ContactSpecialDatesDataSource,
+    private val calendars: CalendarDataSource,
+    private val prefs: SettingsPrefs,
+    private val spec: SpecialDatesCalendarSpec,
+) {
+
+    /**
+     * Reconcile every enabled type against the device's contacts. Returns why it
+     * stopped early (disabled / permission gone) or [SpecialDatesSyncResult.Success].
+     */
+    suspend fun sync(): SpecialDatesSyncResult {
+        if (!prefs.specialDatesEnabled.first()) return SpecialDatesSyncResult.Disabled
+        if (!contacts.hasPermission()) return SpecialDatesSyncResult.PermissionMissing
+
+        val enabledTypes = prefs.specialDatesTypes.first()
+        val calendarByType = reconcileCalendars(enabledTypes)
+
+        val desiredByType = contacts.readSpecialDates().groupBy { it.type }
+        val reminderCtx = readReminderContext()
+        val templates = prefs.specialDatesTitleTemplates.first()
+        val showYear = prefs.specialDatesShowYear.first()
+
+        calendarByType.forEach { (type, calendarId) ->
+            val template = spec.resolveTitleTemplate(type, templates)
+            syncType(
+                calendarId = calendarId,
+                type = type,
+                contactsOfType = desiredByType[type].orEmpty(),
+                template = template,
+                showYear = showYear,
+                reminderCtx = reminderCtx,
+            )
+        }
+        return SpecialDatesSyncResult.Success
+    }
+
+    /**
+     * Set the reminder default for a type's managed calendar and apply it to
+     * **all** its existing events too (not just future ones) — for managed
+     * calendars the reminder is a calendar-level setting. Persists the per-calendar
+     * all-day override so new events keep matching. No-op if the calendar for
+     * [type] doesn't exist yet.
+     */
+    suspend fun applyReminders(type: SpecialDateType, override: CalendarReminderOverride) {
+        val calendarId = prefs.specialDatesCalendars.first()[type] ?: return
+        prefs.setCalendarAllDayReminderOverride(calendarId, override)
+        val minutes = when (override) {
+            CalendarReminderOverride.Inherit -> prefs.defaultAllDayReminderMinutes.first()
+            CalendarReminderOverride.None -> emptyList()
+            is CalendarReminderOverride.Minutes -> override.minutes
+        }
+        calendars.applyManagedCalendarReminders(
+            calendarId = calendarId,
+            allDayReminderTimeMinutes = prefs.allDayReminderTimeMinutes.first(),
+            minutes = minutes,
+        )
+    }
+
+    /** Delete every managed calendar and forget its id — used when the feature is turned off. */
+    suspend fun teardown() {
+        calendars.findManagedCalendars().forEach { calendars.deleteCalendar(it.id) }
+        SpecialDateType.entries.forEach { prefs.setSpecialDatesCalendarId(it, null) }
+    }
+
+    /**
+     * Ensure each enabled type has exactly one managed calendar (adopting an
+     * existing one, or the stored id if it still exists, else creating one) and
+     * that disabled types have none. Returns the calendar id per enabled type.
+     */
+    private suspend fun reconcileCalendars(enabledTypes: Set<SpecialDateType>): Map<SpecialDateType, Long> {
+        val foundByType = calendars.findManagedCalendars()
+            .groupBy({ it.type }, { it.id })
+            .mapValues { it.value.first() }
+        val stored = prefs.specialDatesCalendars.first()
+        val result = LinkedHashMap<SpecialDateType, Long>()
+        for (type in SpecialDateType.entries) {
+            // A stored id counts only if the calendar still exists (the user may
+            // have deleted it in system settings); otherwise adopt a found one.
+            val existingId = stored[type]?.takeIf { id -> foundByType.containsValue(id) }
+                ?: foundByType[type]
+            if (type in enabledTypes) {
+                val id = existingId ?: createCalendar(type)
+                if (stored[type] != id) prefs.setSpecialDatesCalendarId(type, id)
+                result[type] = id
+            } else {
+                if (existingId != null) calendars.deleteCalendar(existingId)
+                if (stored.containsKey(type)) prefs.setSpecialDatesCalendarId(type, null)
+            }
+        }
+        return result
+    }
+
+    private suspend fun createCalendar(type: SpecialDateType): Long {
+        // reconcileCalendars persists the id — the single place ids are recorded.
+        val id = calendars.createManagedCalendar(spec.displayName(type), spec.color(type), type)
+        // Seed a useful all-day reminder default (on the day + a week before), so
+        // birthdays get lead time out of the box. Per-calendar, user-adjustable —
+        // only set when the user hasn't already configured this calendar.
+        if (!prefs.perCalendarAllDayReminderOverride.first().containsKey(id)) {
+            prefs.setCalendarAllDayReminderOverride(
+                id,
+                CalendarReminderOverride.Minutes(DEFAULT_REMINDER_MINUTES),
+            )
+        }
+        return id
+    }
+
+    private suspend fun syncType(
+        calendarId: Long,
+        type: SpecialDateType,
+        contactsOfType: List<ContactSpecialDate>,
+        template: String,
+        showYear: Boolean,
+        reminderCtx: ReminderContext,
+    ) {
+        val built = contactsOfType.map { sd ->
+            buildManagedEvent(calendarId, type, sd, template, showYear, reminderCtx)
+        }
+        val diff = diffManagedEvents(built.map { it.desired }, calendars.queryManagedEvents(calendarId))
+        val formByUid = built.associate { it.desired.uid to it.form }
+        diff.insertUids.forEach { uid ->
+            calendars.insertManagedEvent(formByUid.getValue(uid), uid, reminderCtx.allDayTimeMinutes)
+        }
+        diff.updates.forEach { calendars.updateManagedFields(it.eventId, it.columns) }
+        diff.deleteEventIds.forEach { calendars.deleteEvent(it) }
+    }
+
+    private fun buildManagedEvent(
+        calendarId: Long,
+        type: SpecialDateType,
+        sd: ContactSpecialDate,
+        template: String,
+        showYear: Boolean,
+        reminderCtx: ReminderContext,
+    ): BuiltManagedEvent {
+        val anchor = sd.anchorDate()
+        val start = LocalDateTime(anchor, LocalTime(0, 0))
+        // The source year is static and correct on every occurrence (unlike age).
+        val year = if (showYear) sd.year else null
+        val title = renderSpecialDateTitle(template, sd.displayName, year)
+        val form = EventForm(
+            calendarId = calendarId,
+            title = title,
+            isAllDay = true,
+            start = start,
+            end = start,
+            reminders = reminderCtx.resolveAllDay(calendarId),
+            availability = Availability.Free,
+            rrule = YEARLY_RRULE,
+        )
+        val dtStartMillis = form.toWriteTimes(ZoneId.systemDefault()).dtStartMillis
+        return BuiltManagedEvent(
+            desired = ManagedEventDesired(
+                uid = managedEventUid(type, sd.lookupKey),
+                title = title,
+                dtStartMillis = dtStartMillis,
+                rrule = YEARLY_RRULE,
+            ),
+            form = form,
+        )
+    }
+
+    // Managed events are always all-day, so only the all-day defaults apply.
+    private suspend fun readReminderContext(): ReminderContext = ReminderContext(
+        allDayGlobal = prefs.defaultAllDayReminderMinutes.first(),
+        allDayOverrides = prefs.perCalendarAllDayReminderOverride.first(),
+        allDayTimeMinutes = prefs.allDayReminderTimeMinutes.first(),
+    )
+
+    private data class ReminderContext(
+        val allDayGlobal: List<Int>,
+        val allDayOverrides: Map<Long, List<Int>>,
+        val allDayTimeMinutes: Int,
+    ) {
+        /** Same semantics as `resolveDefaultReminder`: present-empty = explicit none. */
+        fun resolveAllDay(calendarId: Long): List<Int> =
+            allDayOverrides[calendarId] ?: allDayGlobal
+    }
+
+    private data class BuiltManagedEvent(val desired: ManagedEventDesired, val form: EventForm)
+
+    private companion object {
+        /** "On the day" (0) + one week before (7 days), as all-day lead minutes. */
+        val DEFAULT_REMINDER_MINUTES = listOf(0, 7 * 24 * 60)
+        val YEARLY_RRULE = SimpleRecurrence(freq = RecurrenceFreq.Yearly).toRRule()
+    }
+}
+
+/** The managed columns of a desired event, compared against the existing row. */
+internal data class ManagedEventDesired(
+    val uid: String,
+    val title: String,
+    val dtStartMillis: Long,
+    val rrule: String?,
+)
+
+internal data class ManagedFieldUpdate(val eventId: Long, val columns: Map<String, Any?>)
+
+internal data class ManagedDiff(
+    val insertUids: List<String>,
+    val updates: List<ManagedFieldUpdate>,
+    val deleteEventIds: List<Long>,
+)
+
+/**
+ * The idempotent diff at the heart of the mirror, keyed on `UID_2445`:
+ * desired-not-existing → insert, existing-not-desired → delete, and for events
+ * in both only the *changed* managed columns (title/dtstart/rrule) are emitted —
+ * so a re-run with no contact changes produces nothing, and a managed update
+ * never touches user-owned columns or reminder rows. Pure, so it's unit-tested.
+ */
+internal fun diffManagedEvents(
+    desired: List<ManagedEventDesired>,
+    existing: List<ManagedEventRow>,
+): ManagedDiff {
+    val desiredByUid = desired.associateBy { it.uid }
+    val existingByUid = existing.associateBy { it.uid }
+    val insertUids = desired.filter { it.uid !in existingByUid }.map { it.uid }
+    val deleteEventIds = existing.filter { it.uid !in desiredByUid }.map { it.eventId }
+    val updates = buildList {
+        for (d in desired) {
+            val row = existingByUid[d.uid] ?: continue
+            val columns = buildMap<String, Any?> {
+                if (row.title != d.title) put(CalendarContract.Events.TITLE, d.title)
+                if (row.dtStartMillis != d.dtStartMillis) {
+                    put(CalendarContract.Events.DTSTART, d.dtStartMillis)
+                }
+                if (row.rrule != d.rrule) put(CalendarContract.Events.RRULE, d.rrule)
+            }
+            if (columns.isNotEmpty()) add(ManagedFieldUpdate(row.eventId, columns))
+        }
+    }
+    return ManagedDiff(insertUids, updates, deleteEventIds)
+}

app/src/main/java/de/jeanlucmakiola/calendula/data/di/DataModule.kt

@@ -14,6 +14,10 @@ import de.jeanlucmakiola.calendula.data.calendar.AndroidCalendarDataSource
 import de.jeanlucmakiola.calendula.data.calendar.CalendarDataSource
 import de.jeanlucmakiola.calendula.data.calendar.CalendarRepository
 import de.jeanlucmakiola.calendula.data.calendar.CalendarRepositoryImpl
+import de.jeanlucmakiola.calendula.data.contacts.AndroidContactSpecialDatesDataSource
+import de.jeanlucmakiola.calendula.data.contacts.AndroidSpecialDatesCalendarSpec
+import de.jeanlucmakiola.calendula.data.contacts.ContactSpecialDatesDataSource
+import de.jeanlucmakiola.calendula.data.contacts.SpecialDatesCalendarSpec
 import de.jeanlucmakiola.calendula.data.reminders.AndroidReminderAlertStore
 import de.jeanlucmakiola.calendula.data.reminders.ReminderAlertStore
 import kotlinx.coroutines.CoroutineDispatcher
@@ -45,6 +49,18 @@ abstract class DataBindModule {
     abstract fun bindReminderAlertStore(
         impl: AndroidReminderAlertStore,
     ): ReminderAlertStore
+
+    @Binds
+    @Singleton
+    abstract fun bindContactSpecialDatesDataSource(
+        impl: AndroidContactSpecialDatesDataSource,
+    ): ContactSpecialDatesDataSource
+
+    @Binds
+    @Singleton
+    abstract fun bindSpecialDatesCalendarSpec(
+        impl: AndroidSpecialDatesCalendarSpec,
+    ): SpecialDatesCalendarSpec
 }
 
 @Module

app/src/main/java/de/jeanlucmakiola/calendula/data/ics/IcsExporter.kt

@@ -3,6 +3,7 @@ package de.jeanlucmakiola.calendula.data.ics
 import android.content.Context
 import android.net.Uri
 import androidx.core.content.FileProvider
+import androidx.documentfile.provider.DocumentFile
 import dagger.hilt.android.qualifiers.ApplicationContext
 import java.io.File
 import java.io.IOException
@@ -28,6 +29,36 @@ class IcsExporter @Inject constructor(
         } ?: throw IOException("Could not open output stream for export (scheme=${uri.scheme})")
     }
 
+    /**
+     * Write [content] to [fileName] inside the persisted SAF tree [folder],
+     * overwriting it if it already exists (the automatic-backup destination).
+     * Requires a persisted write grant on [folder]. Throws on failure.
+     */
+    fun writeToFolder(folder: Uri, fileName: String, content: String) {
+        val dir = DocumentFile.fromTreeUri(context, folder)
+            ?: throw IOException("Backup folder is not accessible")
+        if (!dir.exists() || !dir.canWrite()) {
+            throw IOException("Backup folder is missing or not writable")
+        }
+        // Reuse the canonical file if present and clean up any "name (1).ics"
+        // duplicates SAF may have created if two runs ever raced — so we always
+        // converge on a single overwritten file.
+        val base = fileName.substringBeforeLast('.')
+        val ext = fileName.substringAfterLast('.', "")
+        var target: DocumentFile? = null
+        for (child in dir.listFiles()) {
+            val name = child.name ?: continue
+            when {
+                name == fileName -> target = child
+                name.startsWith("$base (") && name.endsWith(".$ext") -> child.delete()
+            }
+        }
+        val file = target
+            ?: dir.createFile(MIME_CALENDAR, fileName)
+            ?: throw IOException("Could not create backup file in the chosen folder")
+        writeDocument(file.uri, content)
+    }
+
     /**
      * Stage [content] in a private cache file and return a shareable content
      * Uri for an `ACTION_SEND`. [fileName] is the suggested `.ics` name shown to
@@ -42,5 +73,6 @@ class IcsExporter @Inject constructor(
 
     private companion object {
         const val SHARE_DIR = "shared_ics"
+        const val MIME_CALENDAR = "text/calendar"
     }
 }

app/src/main/java/de/jeanlucmakiola/calendula/data/prefs/CalendarPrefs.kt

@@ -39,6 +39,31 @@ class CalendarPrefs @Inject constructor(
         }
     }
 
+    /**
+     * App-side preference for "calendars the user has disabled in this app" — a
+     * heavier level than [hiddenCalendarIds]. A disabled calendar is removed from
+     * every surface (drawer filter, event-form picker, import picker) and its
+     * events never appear; it stays listed only in Settings → Calendars so it can
+     * be re-enabled. Stored exactly like the hidden set; never touches the
+     * system's VISIBLE/SYNC_EVENTS flags, so other calendar apps are unaffected.
+     */
+    val disabledCalendarIds: Flow<Set<Long>> = store.data.map { prefs ->
+        prefs[DISABLED_IDS_KEY].orEmpty()
+            .split(',')
+            .mapNotNull { it.trim().toLongOrNull() }
+            .toSet()
+    }
+
+    suspend fun setDisabledCalendarIds(ids: Set<Long>) {
+        store.edit { prefs ->
+            if (ids.isEmpty()) {
+                prefs.remove(DISABLED_IDS_KEY)
+            } else {
+                prefs[DISABLED_IDS_KEY] = ids.sorted().joinToString(",")
+            }
+        }
+    }
+
     /**
      * The calendar the user last created an event in; preselected in the
      * event form. Null until the first event is created.
@@ -53,6 +78,7 @@ class CalendarPrefs @Inject constructor(
 
     companion object {
         internal val HIDDEN_IDS_KEY = stringPreferencesKey("hidden_calendar_ids")
+        internal val DISABLED_IDS_KEY = stringPreferencesKey("disabled_calendar_ids")
         internal val LAST_USED_CALENDAR_KEY = longPreferencesKey("last_used_calendar_id")
     }
 }

app/src/main/java/de/jeanlucmakiola/calendula/data/prefs/SettingsPrefs.kt

@@ -5,8 +5,13 @@ import androidx.datastore.preferences.core.Preferences
 import androidx.datastore.preferences.core.booleanPreferencesKey
 import androidx.datastore.preferences.core.edit
 import androidx.datastore.preferences.core.intPreferencesKey
+import androidx.datastore.preferences.core.longPreferencesKey
 import androidx.datastore.preferences.core.stringPreferencesKey
 import de.jeanlucmakiola.calendula.domain.EventFormField
+import de.jeanlucmakiola.calendula.domain.contacts.SpecialDateType
+import de.jeanlucmakiola.calendula.ui.agenda.AgendaRange
+import de.jeanlucmakiola.calendula.ui.agenda.parseAgendaRange
+import de.jeanlucmakiola.calendula.ui.agenda.storageValue
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.map
@@ -19,18 +24,52 @@ import javax.inject.Singleton
 /** Light/dark override. SYSTEM follows the device setting. */
 enum class ThemeMode { SYSTEM, LIGHT, DARK }
 
-/** Week-start override. AUTO derives the first day from the active locale. */
-enum class WeekStartPref { AUTO, MONDAY, SUNDAY }
+/**
+ * Week-start override. [Auto] derives the first day from the active locale;
+ * [Day] pins a specific weekday (any of the seven).
+ */
+sealed interface WeekStartPref {
+    data object Auto : WeekStartPref
+    data class Day(val day: DayOfWeek) : WeekStartPref
+}
 
 /**
- * Resolve the preference to a concrete first-day-of-week. AUTO reads the
- * locale's convention (e.g. Monday in DE, Sunday in en-US).
+ * Clock convention for time-of-day labels. AUTO follows the device's 24-hour
+ * system setting; the others force a 12- or 24-hour clock app-wide.
+ */
+enum class TimeFormatPref { AUTO, TWELVE_HOUR, TWENTY_FOUR_HOUR }
+
+/**
+ * How the Agenda screen treats events that have already finished today: [SHOW]
+ * leaves them as-is (the historical behaviour), [DIM] fades them, [HIDE] drops
+ * them from the list entirely.
+ */
+enum class PastEventDisplay { SHOW, DIM, HIDE }
+
+/** Parse a stored [PastEventDisplay.name]; unknown/null falls back to [default]. */
+fun parsePastEventDisplay(
+    stored: String?,
+    default: PastEventDisplay = PastEventDisplay.SHOW,
+): PastEventDisplay = PastEventDisplay.entries.firstOrNull { it.name == stored } ?: default
+
+/**
+ * Resolve to a concrete 24-hour flag. AUTO defers to [systemIs24Hour] (the
+ * device's `DateFormat.is24HourFormat` value).
+ */
+fun TimeFormatPref.is24Hour(systemIs24Hour: Boolean): Boolean = when (this) {
+    TimeFormatPref.AUTO -> systemIs24Hour
+    TimeFormatPref.TWELVE_HOUR -> false
+    TimeFormatPref.TWENTY_FOUR_HOUR -> true
+}
+
+/**
+ * Resolve the preference to a concrete first-day-of-week. [WeekStartPref.Auto]
+ * reads the locale's convention (e.g. Monday in DE, Sunday in en-US).
  */
 fun WeekStartPref.resolveFirstDay(locale: Locale): DayOfWeek = when (this) {
-    WeekStartPref.MONDAY -> DayOfWeek.MONDAY
-    WeekStartPref.SUNDAY -> DayOfWeek.SUNDAY
+    is WeekStartPref.Day -> day
     // java.time.DayOfWeek.value is ISO 1..7 (Mon..Sun) — same numbering kotlinx uses.
-    WeekStartPref.AUTO -> DayOfWeek(WeekFields.of(locale).firstDayOfWeek.value)
+    WeekStartPref.Auto -> DayOfWeek(WeekFields.of(locale).firstDayOfWeek.value)
 }
 
 /**
@@ -55,7 +94,7 @@ class SettingsPrefs @Inject constructor(
     }
 
     val weekStart: Flow<WeekStartPref> = store.data.map { prefs ->
-        prefs[WEEK_START_KEY].toEnum(WeekStartPref.AUTO)
+        parseWeekStart(prefs[WEEK_START_KEY])
     }
 
     suspend fun setThemeMode(mode: ThemeMode) {
@@ -67,7 +106,87 @@ class SettingsPrefs @Inject constructor(
     }
 
     suspend fun setWeekStart(pref: WeekStartPref) {
-        store.edit { it[WEEK_START_KEY] = pref.name }
+        store.edit { it[WEEK_START_KEY] = pref.storageValue() }
+    }
+
+    /** Clock convention for time-of-day labels (v2.11). Defaults to AUTO (system). */
+    val timeFormat: Flow<TimeFormatPref> = store.data.map { prefs ->
+        prefs[TIME_FORMAT_KEY].toEnum(TimeFormatPref.AUTO)
+    }
+
+    suspend fun setTimeFormat(pref: TimeFormatPref) {
+        store.edit { it[TIME_FORMAT_KEY] = pref.name }
+    }
+
+    /**
+     * Whether the week/day timeline draws a faint separator line at each hour
+     * (v2.11). Defaults to OFF — the historical clean look; users opt in.
+     */
+    val showHourLines: Flow<Boolean> = store.data.map { prefs ->
+        prefs[SHOW_HOUR_LINES_KEY] ?: false
+    }
+
+    suspend fun setShowHourLines(enabled: Boolean) {
+        store.edit { it[SHOW_HOUR_LINES_KEY] = enabled }
+    }
+
+    /**
+     * How the Agenda screen treats events that already ended today. Defaults to
+     * [PastEventDisplay.SHOW] — the historical behaviour; users opt into dimming
+     * or hiding.
+     */
+    val pastEventDisplay: Flow<PastEventDisplay> = store.data.map { prefs ->
+        prefs[PAST_EVENT_DISPLAY_KEY].toEnum(PastEventDisplay.SHOW)
+    }
+
+    suspend fun setPastEventDisplay(mode: PastEventDisplay) {
+        store.edit { it[PAST_EVENT_DISPLAY_KEY] = mode.name }
+    }
+
+    /**
+     * Whether the month/week grids fade events that have already finished.
+     * Defaults to OFF — independent of the Agenda's [pastEventDisplay].
+     */
+    val dimCompletedEvents: Flow<Boolean> = store.data.map { prefs ->
+        prefs[DIM_COMPLETED_EVENTS_KEY] ?: false
+    }
+
+    suspend fun setDimCompletedEvents(enabled: Boolean) {
+        store.edit { it[DIM_COMPLETED_EVENTS_KEY] = enabled }
+    }
+
+    /**
+     * How far ahead the in-app Agenda screen shows events (v2.11). Defaults to
+     * [AgendaRange.Month] — a month of upcoming events. Independent of the
+     * widget's [agendaWidgetRange].
+     */
+    val agendaScreenRange: Flow<AgendaRange> = store.data.map { prefs ->
+        parseAgendaRange(prefs[AGENDA_SCREEN_RANGE_KEY], AgendaRange.Month)
+    }
+
+    suspend fun setAgendaScreenRange(range: AgendaRange) {
+        store.edit { it[AGENDA_SCREEN_RANGE_KEY] = range.storageValue() }
+    }
+
+    /** How far ahead the agenda **widget** shows events (v2.11). Defaults to Month. */
+    val agendaWidgetRange: Flow<AgendaRange> = store.data.map { prefs ->
+        parseAgendaRange(prefs[AGENDA_WIDGET_RANGE_KEY], AgendaRange.Month)
+    }
+
+    suspend fun setAgendaWidgetRange(range: AgendaRange) {
+        store.edit { it[AGENDA_WIDGET_RANGE_KEY] = range.storageValue() }
+    }
+
+    /**
+     * Whether the agenda shows its top range bar — the "showing …" header and
+     * the session range switcher (v2.11). Default ON.
+     */
+    val agendaShowRangeBar: Flow<Boolean> = store.data.map { prefs ->
+        prefs[AGENDA_SHOW_RANGE_BAR_KEY] ?: true
+    }
+
+    suspend fun setAgendaShowRangeBar(enabled: Boolean) {
+        store.edit { it[AGENDA_SHOW_RANGE_BAR_KEY] = enabled }
     }
 
     /**
@@ -102,6 +221,20 @@ class SettingsPrefs @Inject constructor(
         }
     }
 
+    /**
+     * Whether opening the new-event form focuses the title field and raises the
+     * keyboard straight away (issue #10). Default ON — a new event almost always
+     * gets a title, so this saves a tap; users who set the time/calendar first
+     * can turn it off. Only the create form auto-focuses — editing never does.
+     */
+    val autofocusEventTitle: Flow<Boolean> = store.data.map { prefs ->
+        prefs[AUTOFOCUS_EVENT_TITLE_KEY] ?: true
+    }
+
+    suspend fun setAutofocusEventTitle(enabled: Boolean) {
+        store.edit { it[AUTOFOCUS_EVENT_TITLE_KEY] = enabled }
+    }
+
     /**
      * Whether Calendula posts reminder notifications (v1.4). Defaults to ON —
      * for users whose only calendar app this is, reminders are essential; the
@@ -144,35 +277,36 @@ class SettingsPrefs @Inject constructor(
     }
 
     /**
-     * The default reminder lead time (minutes before start) prefilled on new
-     * **timed** events. `null` = no default reminder — the prior behaviour, kept
-     * as the factory default so existing users aren't surprised by reminders they
-     * never asked for. Stored as a string so "none" is distinct from a numeric
-     * value (and from an unset key, which is also "none"). Per-calendar overrides
-     * in [perCalendarReminderOverride] take precedence; all-day events instead use
+     * The default reminder lead times (minutes before start) prefilled on new
+     * **timed** events. The empty list = no default reminder — the prior
+     * behaviour, kept as the factory default so existing users aren't surprised by
+     * reminders they never asked for. Stored as a comma-joined list of minutes, or
+     * "none"/empty for no reminder (also the unset state). A legacy single value
+     * ("30") parses transparently to a one-element list. Per-calendar overrides in
+     * [perCalendarReminderOverride] take precedence; all-day events instead use
      * [defaultAllDayReminderMinutes]. Resolve with [resolveDefaultReminder].
      */
-    val defaultReminderMinutes: Flow<Int?> = store.data.map { prefs ->
-        prefs[DEFAULT_REMINDER_KEY].toReminderMinutes()
+    val defaultReminderMinutes: Flow<List<Int>> = store.data.map { prefs ->
+        prefs[DEFAULT_REMINDER_KEY].toReminderList()
     }
 
-    suspend fun setDefaultReminderMinutes(minutes: Int?) {
-        store.edit { it[DEFAULT_REMINDER_KEY] = minutes?.toString() ?: NONE }
+    suspend fun setDefaultReminderMinutes(minutes: List<Int>) {
+        store.edit { it[DEFAULT_REMINDER_KEY] = minutes.toStoredReminders() }
     }
 
     /**
-     * The default reminder lead time prefilled on new **all-day** events, in
+     * The default reminder lead times prefilled on new **all-day** events, in
      * minutes before the start of the day. All-day events want day-scale lead
      * times ("1 day before"), so they have their own default rather than reusing
-     * the timed one. `null` = no default. Per-calendar overrides do **not** apply
-     * to all-day events — they always use this global value.
+     * the timed one. Empty list = no default. Per-calendar overrides do **not**
+     * apply to all-day events — they always use this global value.
      */
-    val defaultAllDayReminderMinutes: Flow<Int?> = store.data.map { prefs ->
-        prefs[DEFAULT_ALLDAY_REMINDER_KEY].toReminderMinutes()
+    val defaultAllDayReminderMinutes: Flow<List<Int>> = store.data.map { prefs ->
+        prefs[DEFAULT_ALLDAY_REMINDER_KEY].toReminderList()
     }
 
-    suspend fun setDefaultAllDayReminderMinutes(minutes: Int?) {
-        store.edit { it[DEFAULT_ALLDAY_REMINDER_KEY] = minutes?.toString() ?: NONE }
+    suspend fun setDefaultAllDayReminderMinutes(minutes: List<Int>) {
+        store.edit { it[DEFAULT_ALLDAY_REMINDER_KEY] = minutes.toStoredReminders() }
     }
 
     /**
@@ -209,13 +343,13 @@ class SettingsPrefs @Inject constructor(
     /**
      * Per-calendar overrides of [defaultReminderMinutes] for **timed** events,
      * keyed by calendar id. A calendar **present** in the map overrides the global
-     * timed default for its new events: a `null` value means "no reminder", an int
-     * means that lead time. A calendar **absent** from the map inherits the global
-     * default. Serialised as `id=value;id=value`, with `none` for an explicit
-     * no-reminder override. (All-day events ignore this and use
-     * [defaultAllDayReminderMinutes].)
+     * timed default for its new events: an **empty** list means "no reminder", a
+     * non-empty list means those lead times. A calendar **absent** from the map
+     * inherits the global default. Serialised as `id=value;id=value`, where a value
+     * is a comma-joined minute list or `none` for an explicit no-reminder override.
+     * (All-day events ignore this and use [defaultAllDayReminderMinutes].)
      */
-    val perCalendarReminderOverride: Flow<Map<Long, Int?>> = store.data.map { prefs ->
+    val perCalendarReminderOverride: Flow<Map<Long, List<Int>>> = store.data.map { prefs ->
         parseReminderOverrides(prefs[CALENDAR_REMINDER_OVERRIDE_KEY])
     }
 
@@ -232,7 +366,7 @@ class SettingsPrefs @Inject constructor(
      * events, with the same semantics as [perCalendarReminderOverride] (absent =
      * inherit the global all-day default; present null = no reminder).
      */
-    val perCalendarAllDayReminderOverride: Flow<Map<Long, Int?>> = store.data.map { prefs ->
+    val perCalendarAllDayReminderOverride: Flow<Map<Long, List<Int>>> = store.data.map { prefs ->
         parseReminderOverrides(prefs[CALENDAR_ALLDAY_REMINDER_OVERRIDE_KEY])
     }
 
@@ -248,6 +382,141 @@ class SettingsPrefs @Inject constructor(
         }
     }
 
+    // --- Automatic backup (issue #8) ------------------------------------
+
+    /** Whether periodic automatic `.ics` export of local calendars is on. Default OFF. */
+    val autoBackupEnabled: Flow<Boolean> = store.data.map { it[AUTO_BACKUP_ENABLED_KEY] ?: false }
+
+    suspend fun setAutoBackupEnabled(enabled: Boolean) {
+        store.edit { it[AUTO_BACKUP_ENABLED_KEY] = enabled }
+    }
+
+    /** Export interval in minutes. Default daily; floored at [MIN_BACKUP_INTERVAL]. */
+    val autoBackupIntervalMinutes: Flow<Long> = store.data.map { prefs ->
+        (prefs[AUTO_BACKUP_INTERVAL_KEY] ?: DEFAULT_BACKUP_INTERVAL).coerceAtLeast(MIN_BACKUP_INTERVAL)
+    }
+
+    suspend fun setAutoBackupIntervalMinutes(minutes: Long) {
+        store.edit { it[AUTO_BACKUP_INTERVAL_KEY] = minutes.coerceAtLeast(MIN_BACKUP_INTERVAL) }
+    }
+
+    /** Persisted SAF tree Uri of the destination folder, or null if unset. */
+    val autoBackupFolderUri: Flow<String?> = store.data.map { it[AUTO_BACKUP_FOLDER_KEY] }
+
+    suspend fun setAutoBackupFolderUri(uri: String?) {
+        store.edit { prefs ->
+            if (uri == null) prefs.remove(AUTO_BACKUP_FOLDER_KEY) else prefs[AUTO_BACKUP_FOLDER_KEY] = uri
+        }
+    }
+
+    /** Outcome of the last automatic run, for the settings status line. */
+    val autoBackupStatus: Flow<BackupStatus> = store.data.map { prefs ->
+        BackupStatus(
+            lastRun = prefs[AUTO_BACKUP_LAST_RUN_KEY] ?: 0L,
+            lastSuccess = prefs[AUTO_BACKUP_LAST_SUCCESS_KEY] ?: true,
+            consecutiveFailures = prefs[AUTO_BACKUP_FAILURES_KEY] ?: 0,
+        )
+    }
+
+    /** Record an automatic run's outcome; resets the failure streak on success. */
+    suspend fun recordAutoBackupRun(success: Boolean, atMillis: Long) {
+        store.edit { prefs ->
+            prefs[AUTO_BACKUP_LAST_RUN_KEY] = atMillis
+            prefs[AUTO_BACKUP_LAST_SUCCESS_KEY] = success
+            val failures = prefs[AUTO_BACKUP_FAILURES_KEY] ?: 0
+            prefs[AUTO_BACKUP_FAILURES_KEY] = if (success) 0 else failures + 1
+        }
+    }
+
+    // --- Contact special dates (issue #15) ------------------------------
+
+    /** Master switch for the contact special-dates mirror. Default OFF (opt-in). */
+    val specialDatesEnabled: Flow<Boolean> = store.data.map { it[SPECIAL_DATES_ENABLED_KEY] ?: false }
+
+    suspend fun setSpecialDatesEnabled(enabled: Boolean) {
+        store.edit { it[SPECIAL_DATES_ENABLED_KEY] = enabled }
+    }
+
+    /** The date types the user wants mirrored (default: all three). */
+    val specialDatesTypes: Flow<Set<SpecialDateType>> = store.data.map { prefs ->
+        SpecialDateType.entries.filterTo(mutableSetOf()) { prefs[typeEnabledKey(it)] ?: true }
+    }
+
+    suspend fun setSpecialDateTypeEnabled(type: SpecialDateType, enabled: Boolean) {
+        store.edit { it[typeEnabledKey(type)] = enabled }
+    }
+
+    /** The managed calendar id per type, for the ones that currently exist. */
+    val specialDatesCalendars: Flow<Map<SpecialDateType, Long>> = store.data.map { prefs ->
+        SpecialDateType.entries.mapNotNull { type ->
+            prefs[calendarIdKey(type)]?.let { type to it }
+        }.toMap()
+    }
+
+    /** Every managed calendar id — the editor locks title/date/recurrence for their events. */
+    val managedCalendarIds: Flow<Set<Long>> = specialDatesCalendars.map { it.values.toSet() }
+
+    suspend fun setSpecialDatesCalendarId(type: SpecialDateType, calendarId: Long?) {
+        store.edit { prefs ->
+            if (calendarId == null) prefs.remove(calendarIdKey(type)) else prefs[calendarIdKey(type)] = calendarId
+        }
+    }
+
+    /**
+     * The title template per type ("{name}'s birthday"); an empty string means
+     * unset, so the settings screen can seed the localized default. `{name}` is
+     * the contact name, `{age}` the age at the upcoming date (empty when the
+     * birth year is unknown or [specialDatesShowAge] is off).
+     */
+    val specialDatesTitleTemplates: Flow<Map<SpecialDateType, String>> = store.data.map { prefs ->
+        SpecialDateType.entries.associateWith { prefs[titleTemplateKey(it)].orEmpty() }
+    }
+
+    suspend fun setSpecialDatesTitleTemplate(type: SpecialDateType, template: String) {
+        store.edit { it[titleTemplateKey(type)] = template }
+    }
+
+    /** Whether `{year}` resolves in the title (only meaningful when the year is known). Default ON. */
+    val specialDatesShowYear: Flow<Boolean> = store.data.map { it[SPECIAL_DATES_SHOW_YEAR_KEY] ?: true }
+
+    suspend fun setSpecialDatesShowYear(enabled: Boolean) {
+        store.edit { it[SPECIAL_DATES_SHOW_YEAR_KEY] = enabled }
+    }
+
+    /** Outcome of the last mirror sync, for the settings status line. */
+    val specialDatesStatus: Flow<SpecialDatesStatus> = store.data.map { prefs ->
+        SpecialDatesStatus(
+            lastRun = prefs[SPECIAL_DATES_LAST_RUN_KEY] ?: 0L,
+            stalled = prefs[SPECIAL_DATES_STALLED_KEY]
+                ?.let { name -> SpecialDatesStalledReason.entries.firstOrNull { it.name == name } },
+        )
+    }
+
+    /** Record a sync outcome; [stalled] non-null marks the feature paused (e.g. permission revoked). */
+    suspend fun recordSpecialDatesRun(atMillis: Long, stalled: SpecialDatesStalledReason?) {
+        store.edit { prefs ->
+            prefs[SPECIAL_DATES_LAST_RUN_KEY] = atMillis
+            if (stalled == null) prefs.remove(SPECIAL_DATES_STALLED_KEY) else prefs[SPECIAL_DATES_STALLED_KEY] = stalled.name
+        }
+    }
+
+    /** Epoch millis of the last foreground-triggered sync, to debounce ON_RESUME. */
+    val specialDatesLastForegroundSync: Flow<Long> =
+        store.data.map { it[SPECIAL_DATES_LAST_FG_SYNC_KEY] ?: 0L }
+
+    suspend fun setSpecialDatesLastForegroundSync(atMillis: Long) {
+        store.edit { it[SPECIAL_DATES_LAST_FG_SYNC_KEY] = atMillis }
+    }
+
+    private fun typeEnabledKey(type: SpecialDateType) =
+        booleanPreferencesKey("special_dates_type_${type.name}")
+
+    private fun calendarIdKey(type: SpecialDateType) =
+        longPreferencesKey("special_dates_calendar_${type.name}")
+
+    private fun titleTemplateKey(type: SpecialDateType) =
+        stringPreferencesKey("special_dates_title_${type.name}")
+
     private fun parseFormFields(stored: String?): Set<EventFormField> = when (stored) {
         null -> DEFAULT_FORM_FIELDS
         else -> stored.split(',')
@@ -259,8 +528,16 @@ class SettingsPrefs @Inject constructor(
         internal val THEME_MODE_KEY = stringPreferencesKey("theme_mode")
         internal val DYNAMIC_COLOR_KEY = booleanPreferencesKey("dynamic_color")
         internal val WEEK_START_KEY = stringPreferencesKey("week_start")
+        internal val AGENDA_SCREEN_RANGE_KEY = stringPreferencesKey("agenda_screen_range")
+        internal val AGENDA_WIDGET_RANGE_KEY = stringPreferencesKey("agenda_widget_range")
+        internal val AGENDA_SHOW_RANGE_BAR_KEY = booleanPreferencesKey("agenda_show_range_bar")
+        internal val TIME_FORMAT_KEY = stringPreferencesKey("time_format")
+        internal val SHOW_HOUR_LINES_KEY = booleanPreferencesKey("show_hour_lines")
+        internal val PAST_EVENT_DISPLAY_KEY = stringPreferencesKey("agenda_past_event_display")
+        internal val DIM_COMPLETED_EVENTS_KEY = booleanPreferencesKey("dim_completed_events")
         internal val DEFAULT_VIEW_KEY = stringPreferencesKey("default_view")
         internal val FORM_FIELDS_KEY = stringPreferencesKey("event_form_default_fields")
+        internal val AUTOFOCUS_EVENT_TITLE_KEY = booleanPreferencesKey("autofocus_event_title")
         internal val REMINDERS_ENABLED_KEY = booleanPreferencesKey("reminders_enabled")
         internal val REMINDER_ONBOARDING_KEY = booleanPreferencesKey("reminder_onboarding_done")
         internal val ALLOW_COLOR_UNSUPPORTED_KEY =
@@ -282,76 +559,161 @@ class SettingsPrefs @Inject constructor(
             stringPreferencesKey("per_calendar_allday_reminder_override")
         internal val DEFAULT_FORM_FIELDS =
             setOf(EventFormField.Location, EventFormField.Description)
+        internal val AUTO_BACKUP_ENABLED_KEY = booleanPreferencesKey("auto_backup_enabled")
+        internal val AUTO_BACKUP_INTERVAL_KEY = longPreferencesKey("auto_backup_interval_minutes")
+        internal val AUTO_BACKUP_FOLDER_KEY = stringPreferencesKey("auto_backup_folder_uri")
+        internal val AUTO_BACKUP_LAST_RUN_KEY = longPreferencesKey("auto_backup_last_run")
+        internal val AUTO_BACKUP_LAST_SUCCESS_KEY = booleanPreferencesKey("auto_backup_last_success")
+        internal val AUTO_BACKUP_FAILURES_KEY = intPreferencesKey("auto_backup_failures")
+        /** Default automatic-backup interval: daily. */
+        const val DEFAULT_BACKUP_INTERVAL = 1_440L
+        /** Floor for the automatic-backup interval (also above WorkManager's 15-min limit). */
+        const val MIN_BACKUP_INTERVAL = 30L
+
+        internal val SPECIAL_DATES_ENABLED_KEY = booleanPreferencesKey("special_dates_enabled")
+        internal val SPECIAL_DATES_SHOW_YEAR_KEY = booleanPreferencesKey("special_dates_show_year")
+        internal val SPECIAL_DATES_LAST_RUN_KEY = longPreferencesKey("special_dates_last_run")
+        internal val SPECIAL_DATES_STALLED_KEY = stringPreferencesKey("special_dates_stalled_reason")
+        internal val SPECIAL_DATES_LAST_FG_SYNC_KEY =
+            longPreferencesKey("special_dates_last_foreground_sync")
     }
 }
 
+/** Snapshot of the special-dates mirror's last outcome (see [SettingsPrefs.specialDatesStatus]). */
+data class SpecialDatesStatus(
+    /** Epoch millis of the last sync, or 0 if it has never run. */
+    val lastRun: Long,
+    /** Non-null when the mirror is paused and why; null when healthy. */
+    val stalled: SpecialDatesStalledReason?,
+)
+
+/** Why the special-dates mirror is paused. */
+enum class SpecialDatesStalledReason {
+    /** READ_CONTACTS was revoked in system settings after the feature was enabled. */
+    PermissionRevoked,
+}
+
+/** Snapshot of the automatic backup's last outcome (see [SettingsPrefs.autoBackupStatus]). */
+data class BackupStatus(
+    /** Epoch millis of the last run, or 0 if it has never run. */
+    val lastRun: Long,
+    val lastSuccess: Boolean,
+    val consecutiveFailures: Int,
+)
+
 /** A calendar's reminder-default override (see [SettingsPrefs.perCalendarReminderOverride]). */
 sealed interface CalendarReminderOverride {
     /** No override — the calendar uses the global default. */
     data object Inherit : CalendarReminderOverride
     /** Explicit "no reminder" for this calendar, regardless of the global default. */
     data object None : CalendarReminderOverride
-    /** A specific lead time in minutes before the event start. */
-    data class Minutes(val minutes: Int) : CalendarReminderOverride
+    /** Specific lead times in minutes before the event start (non-empty). */
+    data class Minutes(val minutes: List<Int>) : CalendarReminderOverride
 }
 
 /**
- * The lead time to prefill on a new event: the matching per-calendar override
+ * The stored override for [calendarId] in an override map, as a
+ * [CalendarReminderOverride] (absent → [CalendarReminderOverride.Inherit],
+ * empty → [CalendarReminderOverride.None]) — the inverse of how
+ * [SettingsPrefs.setCalendarReminderOverride] stores a choice.
+ */
+fun Map<Long, List<Int>>.choiceFor(calendarId: Long): CalendarReminderOverride = when {
+    !containsKey(calendarId) -> CalendarReminderOverride.Inherit
+    getValue(calendarId).isEmpty() -> CalendarReminderOverride.None
+    else -> CalendarReminderOverride.Minutes(getValue(calendarId))
+}
+
+/**
+ * The lead times to prefill on a new event: the matching per-calendar override
  * if [calendarId] has one for this event kind, otherwise the global default for
  * that kind. All-day events consult [allDayOverrides] / [allDayGlobal]; timed
- * events consult [timedOverrides] / [timedGlobal]. `null` = no reminder. Pure so
- * it can be unit-tested.
+ * events consult [timedOverrides] / [timedGlobal]. The empty list = no reminder.
+ * Pure so it can be unit-tested.
  */
 fun resolveDefaultReminder(
-    timedGlobal: Int?,
-    allDayGlobal: Int?,
-    timedOverrides: Map<Long, Int?>,
-    allDayOverrides: Map<Long, Int?>,
+    timedGlobal: List<Int>,
+    allDayGlobal: List<Int>,
+    timedOverrides: Map<Long, List<Int>>,
+    allDayOverrides: Map<Long, List<Int>>,
     calendarId: Long?,
     isAllDay: Boolean,
-): Int? {
+): List<Int> {
     val overrides = if (isAllDay) allDayOverrides else timedOverrides
     val global = if (isAllDay) allDayGlobal else timedGlobal
     return if (calendarId != null && overrides.containsKey(calendarId)) {
-        overrides[calendarId]
+        overrides.getValue(calendarId)
     } else {
         global
     }
 }
 
-/** Apply a [CalendarReminderOverride] to an override map ([Inherit] removes the key). */
-private fun MutableMap<Long, Int?>.applyOverride(
+/**
+ * Apply a [CalendarReminderOverride] to an override map ([Inherit] removes the
+ * key; [None] and an empty [Minutes] both store the empty list).
+ */
+private fun MutableMap<Long, List<Int>>.applyOverride(
     calendarId: Long,
     override: CalendarReminderOverride,
 ) {
     when (override) {
         CalendarReminderOverride.Inherit -> remove(calendarId)
-        CalendarReminderOverride.None -> put(calendarId, null)
-        is CalendarReminderOverride.Minutes -> put(calendarId, override.minutes)
+        CalendarReminderOverride.None -> put(calendarId, emptyList())
+        is CalendarReminderOverride.Minutes -> put(calendarId, override.minutes.normalizeReminders())
     }
 }
 
+/** Sentinel stored for [WeekStartPref.Auto]; days store their [DayOfWeek.name]. */
+private const val WEEK_START_AUTO = "AUTO"
+
+private fun WeekStartPref.storageValue(): String = when (this) {
+    WeekStartPref.Auto -> WEEK_START_AUTO
+    is WeekStartPref.Day -> day.name
+}
+
+/**
+ * Parse the stored week-start value. "AUTO"/null/garbage → [WeekStartPref.Auto];
+ * a [DayOfWeek] name → [WeekStartPref.Day]. The legacy "MONDAY"/"SUNDAY" enum
+ * values migrate transparently, since both are valid day names.
+ */
+private fun parseWeekStart(stored: String?): WeekStartPref = when (stored) {
+    null, WEEK_START_AUTO -> WeekStartPref.Auto
+    else -> DayOfWeek.entries.firstOrNull { it.name == stored }
+        ?.let { WeekStartPref.Day(it) } ?: WeekStartPref.Auto
+}
+
 private const val NONE = "none"
 private const val ENTRY_SEP = ";"
 private const val KEY_VALUE_SEP = "="
+private const val LIST_SEP = ","
 
-private fun String?.toReminderMinutes(): Int? = when (this) {
-    null, "", NONE -> null
-    else -> toIntOrNull()
+/** Distinct, ascending lead times — the canonical form stored and resolved. */
+private fun List<Int>.normalizeReminders(): List<Int> = distinct().sorted()
+
+/**
+ * Parse a stored reminder value into lead times. `null`/empty/"none" → empty
+ * list; a comma-joined list → its minutes; a legacy single value ("30") → a
+ * one-element list. Non-numeric parts are dropped defensively.
+ */
+private fun String?.toReminderList(): List<Int> = when {
+    this == null || isEmpty() || this == NONE -> emptyList()
+    else -> split(LIST_SEP).mapNotNull { it.trim().toIntOrNull() }.normalizeReminders()
 }
 
-private fun parseReminderOverrides(stored: String?): Map<Long, Int?> {
+/** Serialise lead times for storage: "none" when empty, else comma-joined. */
+private fun List<Int>.toStoredReminders(): String =
+    if (isEmpty()) NONE else normalizeReminders().joinToString(LIST_SEP) { it.toString() }
+
+private fun parseReminderOverrides(stored: String?): Map<Long, List<Int>> {
     if (stored.isNullOrBlank()) return emptyMap()
     return stored.split(ENTRY_SEP).mapNotNull { entry ->
         val parts = entry.split(KEY_VALUE_SEP).takeIf { it.size == 2 } ?: return@mapNotNull null
         val id = parts[0].toLongOrNull() ?: return@mapNotNull null
-        val value = if (parts[1] == NONE) null else parts[1].toIntOrNull() ?: return@mapNotNull null
-        id to value
+        id to parts[1].toReminderList()
     }.toMap()
 }
 
-private fun serializeReminderOverrides(map: Map<Long, Int?>): String =
-    map.entries.joinToString(ENTRY_SEP) { (id, minutes) -> "$id$KEY_VALUE_SEP${minutes ?: NONE}" }
+private fun serializeReminderOverrides(map: Map<Long, List<Int>>): String =
+    map.entries.joinToString(ENTRY_SEP) { (id, minutes) -> "$id$KEY_VALUE_SEP${minutes.toStoredReminders()}" }
 
 private inline fun <reified E : Enum<E>> String?.toEnum(default: E): E =
     this?.let { stored -> enumValues<E>().firstOrNull { it.name == stored } } ?: default

app/src/main/java/de/jeanlucmakiola/calendula/data/reminders/EventReminderReceiver.kt

@@ -8,6 +8,7 @@ import android.content.pm.PackageManager
 import android.provider.CalendarContract
 import androidx.core.content.ContextCompat
 import dagger.hilt.android.AndroidEntryPoint
+import de.jeanlucmakiola.calendula.data.prefs.CalendarPrefs
 import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -16,6 +17,17 @@ import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
 import javax.inject.Inject
 
+/**
+ * The due alerts that should actually surface as notifications: everything
+ * except alerts whose calendar the user has disabled in-app (mirroring the
+ * event filtering in CalendarRepositoryImpl). The caller still marks the full
+ * due set fired, so suppressed alerts are not re-broadcast by the provider.
+ */
+internal fun postableAlerts(
+    due: List<ReminderAlert>,
+    disabledCalendarIds: Set<Long>,
+): List<ReminderAlert> = due.filterNot { it.calendarId in disabledCalendarIds }
+
 /**
  * Becomes the app that turns the calendar provider's reminder alarms into
  * visible notifications (the Etar model — the provider broadcasts
@@ -32,6 +44,7 @@ class EventReminderReceiver : BroadcastReceiver() {
     @Inject lateinit var alertStore: ReminderAlertStore
     @Inject lateinit var notifier: ReminderNotifier
     @Inject lateinit var settingsPrefs: SettingsPrefs
+    @Inject lateinit var calendarPrefs: CalendarPrefs
 
     override fun onReceive(context: Context, intent: Intent) {
         if (intent.action != CalendarContract.ACTION_EVENT_REMINDER) return
@@ -46,7 +59,11 @@ class EventReminderReceiver : BroadcastReceiver() {
                 if (settingsPrefs.remindersEnabled.first()) {
                     val now = System.currentTimeMillis()
                     val due = alertStore.dueAlerts(now)
-                    due.forEach(notifier::post)
+                    val disabled = calendarPrefs.disabledCalendarIds.first()
+                    // Suppress reminders for disabled calendars, but still mark
+                    // every due alert fired so the provider stops re-broadcasting
+                    // the suppressed ones.
+                    postableAlerts(due, disabled).forEach { notifier.post(it) }
                     alertStore.markFired(due.map { it.alertId }, now)
                 }
             } finally {

app/src/main/java/de/jeanlucmakiola/calendula/data/reminders/ReminderActionReceiver.kt

@@ -75,6 +75,7 @@ class ReminderActionReceiver : BroadcastReceiver() {
 
         private const val EXTRA_ALERT_ID = "alert_id"
         private const val EXTRA_EVENT_ID = "event_id"
+        private const val EXTRA_CALENDAR_ID = "calendar_id"
         private const val EXTRA_BEGIN = "begin"
         private const val EXTRA_END = "end"
         private const val EXTRA_TITLE = "title"
@@ -87,6 +88,7 @@ class ReminderActionReceiver : BroadcastReceiver() {
                 this.action = action
                 putExtra(EXTRA_ALERT_ID, alert.alertId)
                 putExtra(EXTRA_EVENT_ID, alert.eventId)
+                putExtra(EXTRA_CALENDAR_ID, alert.calendarId)
                 putExtra(EXTRA_BEGIN, alert.beginMillis)
                 putExtra(EXTRA_END, alert.endMillis)
                 putExtra(EXTRA_TITLE, alert.title)
@@ -113,6 +115,7 @@ class ReminderActionReceiver : BroadcastReceiver() {
             return ReminderAlert(
                 alertId = intent.getLongExtra(EXTRA_ALERT_ID, 0L),
                 eventId = intent.getLongExtra(EXTRA_EVENT_ID, 0L),
+                calendarId = intent.getLongExtra(EXTRA_CALENDAR_ID, 0L),
                 beginMillis = intent.getLongExtra(EXTRA_BEGIN, 0L),
                 endMillis = intent.getLongExtra(EXTRA_END, 0L),
                 title = intent.getStringExtra(EXTRA_TITLE).orEmpty(),

app/src/main/java/de/jeanlucmakiola/calendula/data/reminders/ReminderAlertStore.kt

@@ -16,6 +16,7 @@ import javax.inject.Singleton
 data class ReminderAlert(
     val alertId: Long,
     val eventId: Long,
+    val calendarId: Long,
     val beginMillis: Long,
     val endMillis: Long,
     /** Raw event title; may be blank — the notifier substitutes "(no title)". */
@@ -66,11 +67,12 @@ class AndroidReminderAlertStore @Inject constructor(
                     ReminderAlert(
                         alertId = c.getLong(0),
                         eventId = c.getLong(1),
-                        beginMillis = c.getLong(2),
-                        endMillis = c.getLong(3),
-                        title = c.getString(4).orEmpty(),
-                        location = c.getString(5)?.takeIf { it.isNotBlank() },
-                        isAllDay = c.getInt(6) == 1,
+                        calendarId = c.getLong(2),
+                        beginMillis = c.getLong(3),
+                        endMillis = c.getLong(4),
+                        title = c.getString(5).orEmpty(),
+                        location = c.getString(6)?.takeIf { it.isNotBlank() },
+                        isAllDay = c.getInt(7) == 1,
                     ),
                 )
             }
@@ -102,6 +104,7 @@ class AndroidReminderAlertStore @Inject constructor(
         val PROJECTION = arrayOf(
             CalendarContract.CalendarAlerts._ID,
             CalendarContract.CalendarAlerts.EVENT_ID,
+            CalendarContract.CalendarAlerts.CALENDAR_ID,
             CalendarContract.CalendarAlerts.BEGIN,
             CalendarContract.CalendarAlerts.END,
             CalendarContract.CalendarAlerts.TITLE,

app/src/main/java/de/jeanlucmakiola/calendula/data/reminders/ReminderNotifier.kt

@@ -14,6 +14,9 @@ import androidx.core.content.ContextCompat
 import dagger.hilt.android.qualifiers.ApplicationContext
 import de.jeanlucmakiola.calendula.MainActivity
 import de.jeanlucmakiola.calendula.R
+import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
+import de.jeanlucmakiola.calendula.data.prefs.is24Hour
+import kotlinx.coroutines.flow.first
 import java.time.ZoneId
 import java.util.Locale
 import javax.inject.Inject
@@ -29,6 +32,7 @@ import javax.inject.Singleton
 @Singleton
 class ReminderNotifier @Inject constructor(
     @ApplicationContext private val context: Context,
+    private val settingsPrefs: SettingsPrefs,
 ) {
 
     /** False when the user declined `POST_NOTIFICATIONS` or muted the app. */
@@ -39,15 +43,18 @@ class ReminderNotifier @Inject constructor(
         return granted && NotificationManagerCompat.from(context).areNotificationsEnabled()
     }
 
-    fun post(alert: ReminderAlert) {
+    suspend fun post(alert: ReminderAlert) {
         ensureChannel()
         val title = alert.title.ifBlank { context.getString(R.string.event_untitled) }
+        val is24Hour = settingsPrefs.timeFormat.first()
+            .is24Hour(android.text.format.DateFormat.is24HourFormat(context))
         val time = reminderTimeText(
             beginMillis = alert.beginMillis,
             endMillis = alert.endMillis,
             isAllDay = alert.isAllDay,
             zone = ZoneId.systemDefault(),
             locale = Locale.getDefault(),
+            is24Hour = is24Hour,
         )
         val text = listOfNotNull(time, alert.location).joinToString(" · ")
         val notification = NotificationCompat.Builder(context, CHANNEL_ID)

app/src/main/java/de/jeanlucmakiola/calendula/data/reminders/ReminderTimeText.kt

@@ -1,5 +1,6 @@
 package de.jeanlucmakiola.calendula.data.reminders
 
+import de.jeanlucmakiola.calendula.ui.common.timeOfDayFormatter
 import java.time.Instant
 import java.time.ZoneId
 import java.time.ZoneOffset
@@ -25,6 +26,7 @@ fun reminderTimeText(
     isAllDay: Boolean,
     zone: ZoneId,
     locale: Locale,
+    is24Hour: Boolean,
 ): String {
     if (isAllDay) {
         val dateFormat = DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM).withLocale(locale)
@@ -40,16 +42,18 @@ fun reminderTimeText(
         }
     }
 
-    val timeFormat = DateTimeFormatter.ofLocalizedTime(FormatStyle.SHORT).withLocale(locale)
+    val timeFormat = timeOfDayFormatter(is24Hour, locale)
     val begin = Instant.ofEpochMilli(beginMillis).atZone(zone)
     val end = Instant.ofEpochMilli(endMillis).atZone(zone)
     return if (begin.toLocalDate() == end.toLocalDate()) {
         timeFormat.format(begin) + RANGE + timeFormat.format(end)
     } else {
-        val dateTimeFormat = DateTimeFormatter
-            .ofLocalizedDateTime(FormatStyle.MEDIUM, FormatStyle.SHORT)
-            .withLocale(locale)
-        dateTimeFormat.format(begin) + RANGE + dateTimeFormat.format(end)
+        // Cross-day: medium date + the chosen short time, joined per side. Built
+        // from the two formatters (not ofLocalizedDateTime) so the 12/24h choice
+        // applies to the time portion too.
+        val dateFormat = DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM).withLocale(locale)
+        val dateTime = { z: java.time.ZonedDateTime -> "${dateFormat.format(z)}, ${timeFormat.format(z)}" }
+        dateTime(begin) + RANGE + dateTime(end)
     }
 }
 

app/src/main/java/de/jeanlucmakiola/calendula/domain/Models.kt

@@ -40,6 +40,14 @@ data class EventInstance(
     val location: String?,
 )
 
+/**
+ * Whether this event has finished relative to [now] — its end is at or before
+ * the current instant. An in-progress event (already started but not yet ended)
+ * is *not* considered ended. All-day events end at the exclusive next-midnight,
+ * so they only count as ended once their day is fully over.
+ */
+fun EventInstance.hasEnded(now: Instant): Boolean = end <= now
+
 data class EventDetail(
     val instance: EventInstance,
     val description: String?,

app/src/main/java/de/jeanlucmakiola/calendula/domain/contacts/ContactSpecialDate.kt

@@ -0,0 +1,122 @@
+package de.jeanlucmakiola.calendula.domain.contacts
+
+import java.time.LocalDate
+
+/**
+ * The kinds of contact "special date" Calendula mirrors into local calendars.
+ * Each kind gets its own local calendar, so it inherits per-calendar colour,
+ * visibility and reminder defaults for free. See
+ * docs/design/contact-special-dates.md.
+ */
+enum class SpecialDateType {
+    Birthday,
+    Anniversary,
+
+    /** Everything else — a contact "Event" that is neither birthday nor anniversary. */
+    Custom,
+}
+
+/**
+ * One dated event read from a device contact (a `ContactsContract` `Event`
+ * row). The [lookupKey] is the stable contact identity used to reconcile the
+ * mirror without duplicating; [year] is null when the contact stored the date
+ * without one (`--MM-dd`), in which case age can't be shown.
+ */
+data class ContactSpecialDate(
+    val lookupKey: String,
+    val displayName: String,
+    val type: SpecialDateType,
+    val month: Int,
+    val day: Int,
+    val year: Int?,
+    /** The contact's custom label for a [SpecialDateType.Custom] date, if any. */
+    val label: String? = null,
+)
+
+/** The parsed month/day (+ optional year) of a contact date. */
+data class ContactDateParts(val year: Int?, val month: Int, val day: Int)
+
+/**
+ * A fixed leap year to validate and anchor year-less dates against, so that a
+ * `--02-29` birthday is representable (and, once anchored, only recurs in leap
+ * years — matching how the calendar provider expands a yearly Feb-29 series).
+ */
+const val YEARLESS_ANCHOR_YEAR = 1972
+
+/**
+ * Parse a `ContactsContract.CommonDataKinds.Event.START_DATE` value into its
+ * calendar parts, or null if it isn't a usable date. Handles the three shapes
+ * seen in the wild:
+ * - full `yyyy-MM-dd` (year known),
+ * - year-less `--MM-dd` (year null),
+ * - compact `yyyyMMdd`.
+ *
+ * A date that names an impossible day (e.g. `1999-02-29`) is rejected. Pure, so
+ * it's unit-tested without a device.
+ */
+fun parseContactEventDate(raw: String?): ContactDateParts? {
+    val s = raw?.trim().orEmpty()
+    if (s.isEmpty()) return null
+
+    // Year-less: "--MM-dd" or "--MMdd".
+    if (s.startsWith("--")) {
+        val (m, d) = parseMonthDay(s.substring(2)) ?: return null
+        return validated(null, m, d)
+    }
+
+    if (s.contains('-')) {
+        val parts = s.split('-').filter { it.isNotEmpty() }
+        return when (parts.size) {
+            // "yyyy-MM-dd" — but a leading '-' would have dropped the empty
+            // first part, so require the first token to look like a year.
+            3 -> if (s.startsWith('-')) null else validated(
+                year = parts[0].toIntOrNull() ?: return null,
+                month = parts[1].toIntOrNull() ?: return null,
+                day = parts[2].toIntOrNull() ?: return null,
+            )
+            // Year-less "MM-dd" without the "--" prefix.
+            2 -> validated(
+                year = null,
+                month = parts[0].toIntOrNull() ?: return null,
+                day = parts[1].toIntOrNull() ?: return null,
+            )
+            else -> null
+        }
+    }
+
+    // Compact "yyyyMMdd".
+    if (s.length == 8 && s.all { it.isDigit() }) {
+        return validated(
+            year = s.substring(0, 4).toInt(),
+            month = s.substring(4, 6).toInt(),
+            day = s.substring(6, 8).toInt(),
+        )
+    }
+
+    return null
+}
+
+/** "MM-dd" or compact "MMdd". */
+private fun parseMonthDay(rest: String): Pair<Int, Int>? {
+    if (rest.contains('-')) {
+        val p = rest.split('-').filter { it.isNotEmpty() }
+        if (p.size != 2) return null
+        return (p[0].toIntOrNull() ?: return null) to (p[1].toIntOrNull() ?: return null)
+    }
+    if (rest.length == 4 && rest.all { it.isDigit() }) {
+        return rest.substring(0, 2).toInt() to rest.substring(2, 4).toInt()
+    }
+    return null
+}
+
+/**
+ * Confirm month/day form a real calendar date (validated against the actual
+ * year when known, otherwise the leap anchor so `02-29` survives).
+ */
+private fun validated(year: Int?, month: Int, day: Int): ContactDateParts? {
+    if (month !in 1..12 || day !in 1..31) return null
+    val checkYear = year ?: YEARLESS_ANCHOR_YEAR
+    return runCatching { LocalDate.of(checkYear, month, day) }
+        .map { ContactDateParts(year, month, day) }
+        .getOrNull()
+}

app/src/main/java/de/jeanlucmakiola/calendula/domain/contacts/SpecialDateFormatting.kt

@@ -0,0 +1,37 @@
+package de.jeanlucmakiola.calendula.domain.contacts
+
+import kotlinx.datetime.LocalDate
+
+/**
+ * The deterministic `Events.UID_2445` that ties a mirrored event to its source
+ * contact date. Stable across syncs (the reconciliation key), and namespaced by
+ * type so the same contact's birthday and anniversary never collide.
+ */
+fun managedEventUid(type: SpecialDateType, lookupKey: String): String =
+    "contact-${type.name.lowercase()}:$lookupKey@calendula"
+
+/**
+ * The all-day date the recurring `FREQ=YEARLY` series is anchored at: the real
+ * date when the year is known (so age can be derived), otherwise the month/day
+ * on a fixed leap anchor year so a `--02-29` date stays representable and the
+ * anchor never drifts between syncs.
+ */
+fun ContactSpecialDate.anchorDate(): LocalDate =
+    LocalDate(year ?: YEARLESS_ANCHOR_YEAR, month, day)
+
+/**
+ * Render a title [template] for a contact, substituting `{name}` and `{year}`
+ * (the source year — a birthday's birth year or an anniversary's start year;
+ * empty when [year] is null). Unlike an age, the year is static and correct on
+ * every occurrence of the yearly event. Collapses the whitespace an empty
+ * `{year}` may leave behind, so "{name}'s birthday ({year})" degrades cleanly to
+ * "Jane's birthday" when no year is known.
+ */
+fun renderSpecialDateTitle(template: String, name: String, year: Int?): String =
+    template
+        .replace("{name}", name)
+        .replace("{year}", year?.toString().orEmpty())
+        // Drop an empty "()" left by an unresolved {year}, then tidy spacing.
+        .replace(Regex("""\(\s*\)"""), "")
+        .replace(Regex("""\s+"""), " ")
+        .trim()

app/src/main/java/de/jeanlucmakiola/calendula/ui/CalendarHost.kt

@@ -196,7 +196,9 @@ fun CalendarHost(
                 dismissCoveringOverlays()
                 createDateIso = null
                 pendingDayIso = req.dateIso
-                viewStack = viewBaseStack(defaultView, req.source).drillToDay()
+                // No widget source (an external date tap) roots over the default
+                // home view, so backing out of the day returns home then exits.
+                viewStack = viewBaseStack(defaultView, req.source ?: defaultView).drillToDay()
                 onWidgetNavConsumed()
             }
             is WidgetNavRequest.OpenEvent -> {

app/src/main/java/de/jeanlucmakiola/calendula/ui/RootScreen.kt

@@ -19,6 +19,8 @@ import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleEventObserver
+import de.jeanlucmakiola.calendula.data.contacts.SpecialDatesScheduler
+import de.jeanlucmakiola.calendula.data.contacts.hasContactsPermission
 import de.jeanlucmakiola.calendula.ui.permission.PermissionScreen
 import de.jeanlucmakiola.calendula.ui.permission.ReminderOnboardingScreen
 import de.jeanlucmakiola.calendula.ui.permission.ReminderOnboardingViewModel
@@ -49,6 +51,12 @@ fun RootScreen(
                 hasPermission = ContextCompat.checkSelfPermission(
                     context, Manifest.permission.READ_CALENDAR
                 ) == PackageManager.PERMISSION_GRANTED
+                // Refresh the contact special-dates mirror on foreground (the
+                // worker is debounced and no-ops when the feature is off). Gated
+                // on the permission so users without the opt-in never enqueue it.
+                if (context.hasContactsPermission()) {
+                    SpecialDatesScheduler.runNow(context, foreground = true)
+                }
             }
         }
         lifecycle.addObserver(obs)

app/src/main/java/de/jeanlucmakiola/calendula/ui/WidgetNavRequest.kt

@@ -13,8 +13,13 @@ import de.jeanlucmakiola.calendula.ui.common.CalendarView
  * detail-key channel and leave the base view untouched.)
  */
 sealed interface WidgetNavRequest {
-    /** Open the day view anchored on [dateIso] (an ISO `yyyy-MM-dd` date), over [source]. */
-    data class OpenDate(val dateIso: String, val source: CalendarView) : WidgetNavRequest
+    /**
+     * Open the day view anchored on [dateIso] (an ISO `yyyy-MM-dd` date), over
+     * [source]. A null [source] means the request came from outside the app (a
+     * launcher/clock date tap, issue #9) rather than a widget, so it roots over
+     * the default home view instead of a widget's view.
+     */
+    data class OpenDate(val dateIso: String, val source: CalendarView?) : WidgetNavRequest
 
     /** Open one occurrence's detail (an agenda-widget event tap), over [source]. */
     data class OpenEvent(

app/src/main/java/de/jeanlucmakiola/calendula/ui/agenda/AgendaRange.kt

@@ -0,0 +1,111 @@
+package de.jeanlucmakiola.calendula.ui.agenda
+
+import kotlinx.datetime.DayOfWeek
+import kotlinx.datetime.LocalDate
+import java.time.YearMonth
+import java.time.format.DateTimeFormatter
+import java.time.format.FormatStyle
+import java.util.Locale
+
+/**
+ * How far ahead the agenda (screen or widget) shows events, starting at today.
+ *
+ * Two flavours:
+ * - **Rolling** windows of a fixed length: [Day] (today), [Week] (7 days),
+ *   [Month] (30 days), [Custom] (1–365 days). These never degenerate.
+ * - **Calendar-aligned** windows that end at a period boundary: [ThisWeek] runs
+ *   through the end of the current week (respecting the week-start preference —
+ *   a Monday start means "everything before next Monday"); [ThisMonth] runs
+ *   through the last day of the current month. These shrink as the period ends.
+ */
+sealed interface AgendaRange {
+    data object Day : AgendaRange
+    data object Week : AgendaRange
+    data object Month : AgendaRange
+    data object ThisWeek : AgendaRange
+    data object ThisMonth : AgendaRange
+    data class Custom(val days: Int) : AgendaRange
+
+    companion object {
+        /** Allowed bounds for a [Custom] day count. */
+        const val MIN_CUSTOM_DAYS = 1
+        const val MAX_CUSTOM_DAYS = 365
+    }
+}
+
+private const val DAYS_PER_WEEK = 7
+
+/**
+ * Inclusive number of days the window spans, starting at (and including)
+ * [anchor]. The calendar-aligned ranges depend on the anchor day and, for
+ * [AgendaRange.ThisWeek], the [weekStart] preference.
+ */
+fun AgendaRange.dayCount(anchor: LocalDate, weekStart: DayOfWeek): Int = when (this) {
+    AgendaRange.Day -> 1
+    AgendaRange.Week -> DAYS_PER_WEEK
+    AgendaRange.Month -> 30
+    AgendaRange.ThisWeek -> {
+        // Days elapsed since the week's first day (0 when today *is* the start),
+        // so the window is the rest of the week through the day before it repeats.
+        val sinceWeekStart = ((anchor.dayOfWeek.ordinal - weekStart.ordinal) + DAYS_PER_WEEK) % DAYS_PER_WEEK
+        DAYS_PER_WEEK - sinceWeekStart
+    }
+    AgendaRange.ThisMonth -> {
+        val daysInMonth = YearMonth.of(anchor.year, anchor.month.ordinal + 1).lengthOfMonth()
+        daysInMonth - anchor.day + 1
+    }
+    is AgendaRange.Custom -> days.coerceIn(AgendaRange.MIN_CUSTOM_DAYS, AgendaRange.MAX_CUSTOM_DAYS)
+}
+
+/** Stored representation: a fixed token, or `CUSTOM:<days>`. */
+fun AgendaRange.storageValue(): String = when (this) {
+    AgendaRange.Day -> "DAY"
+    AgendaRange.Week -> "WEEK"
+    AgendaRange.Month -> "MONTH"
+    AgendaRange.ThisWeek -> "THIS_WEEK"
+    AgendaRange.ThisMonth -> "THIS_MONTH"
+    is AgendaRange.Custom -> "$CUSTOM_PREFIX$days"
+}
+
+/** Parse a stored value; unknown/garbage falls back to [default]. */
+fun parseAgendaRange(stored: String?, default: AgendaRange): AgendaRange = when {
+    stored == "DAY" -> AgendaRange.Day
+    stored == "WEEK" -> AgendaRange.Week
+    stored == "MONTH" -> AgendaRange.Month
+    stored == "THIS_WEEK" -> AgendaRange.ThisWeek
+    stored == "THIS_MONTH" -> AgendaRange.ThisMonth
+    stored != null && stored.startsWith(CUSTOM_PREFIX) -> {
+        val days = stored.removePrefix(CUSTOM_PREFIX).toIntOrNull()
+        if (days != null) {
+            AgendaRange.Custom(days.coerceIn(AgendaRange.MIN_CUSTOM_DAYS, AgendaRange.MAX_CUSTOM_DAYS))
+        } else {
+            default
+        }
+    }
+    else -> default
+}
+
+/**
+ * The concrete span the range covers, starting at [start] through [end]
+ * (inclusive), for a human-readable header:
+ * - [AgendaRange.Day] → a single medium date ("27 Jun 2026")
+ * - [AgendaRange.ThisMonth] → month and year ("June 2026")
+ * - everything else → "start – end" ("27 Jun – 3 Jul 2026")
+ */
+fun agendaRangeWindowSummary(
+    range: AgendaRange,
+    start: LocalDate,
+    end: LocalDate,
+    locale: Locale,
+): String {
+    val javaStart = java.time.LocalDate.of(start.year, start.month.ordinal + 1, start.day)
+    val javaEnd = java.time.LocalDate.of(end.year, end.month.ordinal + 1, end.day)
+    val medium = DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM).withLocale(locale)
+    return when (range) {
+        AgendaRange.Day -> medium.format(javaStart)
+        AgendaRange.ThisMonth -> DateTimeFormatter.ofPattern("LLLL yyyy", locale).format(javaStart)
+        else -> "${DateTimeFormatter.ofPattern("d MMM", locale).format(javaStart)} – ${medium.format(javaEnd)}"
+    }
+}
+
+private const val CUSTOM_PREFIX = "CUSTOM:"

app/src/main/java/de/jeanlucmakiola/calendula/ui/agenda/AgendaScreen.kt

@@ -2,22 +2,26 @@ package de.jeanlucmakiola.calendula.ui.agenda
 
 import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.itemsIndexed
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.EventAvailable
+import androidx.compose.material.icons.filled.Coffee
+import androidx.compose.material.icons.filled.DateRange
 import androidx.compose.material.icons.filled.Menu
 import androidx.compose.material.icons.filled.Search
 import androidx.compose.material3.DrawerValue
@@ -35,9 +39,13 @@ import androidx.compose.material3.TopAppBarScrollBehavior
 import androidx.compose.material3.rememberDrawerState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.alpha
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.input.nestedscroll.nestedScroll
 import androidx.compose.ui.res.stringResource
@@ -46,18 +54,27 @@ import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import de.jeanlucmakiola.calendula.R
+import de.jeanlucmakiola.calendula.data.prefs.PastEventDisplay
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.hasEnded
+import de.jeanlucmakiola.calendula.ui.common.AgendaRangePicker
+import de.jeanlucmakiola.calendula.ui.common.agendaRangeLabel
 import de.jeanlucmakiola.calendula.ui.common.calendarAnimateItem
 import de.jeanlucmakiola.calendula.ui.common.CalendarDrawer
 import de.jeanlucmakiola.calendula.ui.common.CalendarFabColumn
 import de.jeanlucmakiola.calendula.ui.common.CalendarFailure
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
+import de.jeanlucmakiola.calendula.ui.common.EventDimAlpha
 import de.jeanlucmakiola.calendula.ui.common.GroupedRow
 import de.jeanlucmakiola.calendula.ui.common.Position
 import de.jeanlucmakiola.calendula.ui.common.ViewSwitcherPill
 import de.jeanlucmakiola.calendula.ui.common.next
 import de.jeanlucmakiola.calendula.ui.common.pastelize
 import de.jeanlucmakiola.calendula.ui.common.positionOf
+import de.jeanlucmakiola.calendula.ui.common.rememberCurrentMinute
+import de.jeanlucmakiola.calendula.ui.common.currentLocale
+import de.jeanlucmakiola.calendula.ui.common.LocalUse24HourFormat
+import de.jeanlucmakiola.calendula.ui.common.formatTimeOfDay
 import kotlinx.coroutines.launch
 import kotlinx.datetime.DateTimeUnit
 import kotlinx.datetime.LocalDate
@@ -84,15 +101,18 @@ fun AgendaScreen(
 ) {
     val state by viewModel.state.collectAsStateWithLifecycle()
     val anchor by viewModel.anchor.collectAsStateWithLifecycle()
+    val pastDisplay by viewModel.pastEventDisplay.collectAsStateWithLifecycle()
 
     val scrollBehavior = TopAppBarDefaults.pinnedScrollBehavior()
     val drawerState = rememberDrawerState(DrawerValue.Closed)
     val scope = rememberCoroutineScope()
+    var showRangePicker by remember { mutableStateOf(false) }
 
     val isOnToday = when (val s = state) {
         is AgendaUiState.Success -> s.anchor == s.today
         else -> true
     }
+    val successState = state as? AgendaUiState.Success
 
     ModalNavigationDrawer(
         drawerState = drawerState,
@@ -135,21 +155,134 @@ fun AgendaScreen(
                 )
             },
         ) { innerPadding ->
-            AgendaContent(
-                state = state,
-                onRetry = viewModel::goToToday,
-                onEventClick = onEventClick,
+            Column(
                 modifier = Modifier
-                    .padding(innerPadding)
-                    .fillMaxSize(),
+                    .fillMaxSize()
+                    .padding(innerPadding),
+            ) {
+                // One bar at the top: the "showing …" header on the left and the
+                // session range switcher on the right (one settings toggle).
+                successState?.takeIf { it.showRangeBar }?.let { s ->
+                    Row(
+                        verticalAlignment = Alignment.CenterVertically,
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .padding(start = 28.dp, end = 16.dp, top = 8.dp, bottom = 8.dp),
+                    ) {
+                        AgendaRangeBanner(
+                            range = s.range,
+                            start = s.anchor,
+                            end = s.rangeEnd,
+                            modifier = Modifier.weight(1f),
+                        )
+                        AgendaRangePill(
+                            range = s.range,
+                            isOverride = s.rangeIsOverride,
+                            onClick = { showRangePicker = true },
+                        )
+                    }
+                }
+                AgendaContent(
+                    state = state,
+                    pastDisplay = pastDisplay,
+                    onRetry = viewModel::goToToday,
+                    onEventClick = onEventClick,
+                    modifier = Modifier
+                        .weight(1f)
+                        .fillMaxWidth(),
+                )
+            }
+        }
+    }
+
+    if (showRangePicker) {
+        AgendaRangePicker(
+            title = stringResource(R.string.settings_agenda_range),
+            description = stringResource(R.string.agenda_range_override_hint),
+            selected = successState?.range ?: AgendaRange.Month,
+            onSelect = viewModel::setRangeOverride,
+            onDismiss = { showRangePicker = false },
+        )
+    }
+}
+
+/**
+ * A compact tonal pill showing the agenda's current range. Tapping it opens the
+ * range picker as a session-only override. Filled with the primary container
+ * while an override is active, so the temporary state is obvious.
+ */
+@Composable
+private fun AgendaRangePill(
+    range: AgendaRange,
+    isOverride: Boolean,
+    onClick: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    val container = if (isOverride) {
+        MaterialTheme.colorScheme.primaryContainer
+    } else {
+        MaterialTheme.colorScheme.surfaceContainerHigh
+    }
+    val content = if (isOverride) {
+        MaterialTheme.colorScheme.onPrimaryContainer
+    } else {
+        MaterialTheme.colorScheme.onSurfaceVariant
+    }
+    Surface(
+        color = container,
+        contentColor = content,
+        shape = RoundedCornerShape(50),
+        modifier = modifier.clickable(onClick = onClick),
+    ) {
+        Row(
+            verticalAlignment = Alignment.CenterVertically,
+            modifier = Modifier.padding(horizontal = 16.dp, vertical = 10.dp),
+        ) {
+            Icon(
+                imageVector = Icons.Filled.DateRange,
+                contentDescription = null,
+                modifier = Modifier.size(18.dp),
+            )
+            Spacer(Modifier.width(8.dp))
+            Text(
+                text = agendaRangeLabel(range),
+                style = MaterialTheme.typography.labelLarge,
             )
         }
     }
 }
 
+/**
+ * A header naming the concrete window currently shown, e.g. "Showing all events
+ * for · Today, 27 Jun 2026" / "This week, 27 Jun – 3 Jul" / "This month, June 2026".
+ */
+@Composable
+private fun AgendaRangeBanner(
+    range: AgendaRange,
+    start: LocalDate,
+    end: LocalDate,
+    modifier: Modifier = Modifier,
+) {
+    val locale = currentLocale()
+    val window = agendaRangeWindowSummary(range, start, end, locale)
+    Column(modifier = modifier) {
+        Text(
+            text = stringResource(R.string.agenda_range_showing_label),
+            style = MaterialTheme.typography.labelMedium,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+        )
+        Text(
+            text = "${agendaRangeLabel(range)}, $window",
+            style = MaterialTheme.typography.titleMedium,
+            color = MaterialTheme.colorScheme.onSurface,
+        )
+    }
+}
+
 @Composable
 private fun AgendaContent(
     state: AgendaUiState,
+    pastDisplay: PastEventDisplay,
     onRetry: () -> Unit,
     onEventClick: (EventInstance) -> Unit,
     modifier: Modifier = Modifier,
@@ -159,19 +292,42 @@ private fun AgendaContent(
         is AgendaUiState.Failure -> Box(modifier) {
             CalendarFailure(reason = state.reason, onRetry = onRetry)
         }
-        is AgendaUiState.Success ->
-            if (state.days.isEmpty()) {
+        is AgendaUiState.Success -> {
+            val now by rememberCurrentMinute()
+            // Hiding drops finished events — and any day they leave empty; dimming
+            // keeps them but fades the row. Recomputed each minute so events fall
+            // away (or fade) as they end while the screen stays open.
+            val days = if (pastDisplay == PastEventDisplay.HIDE) {
+                state.days.mapNotNull { day ->
+                    val remaining = day.events.filterNot { it.hasEnded(now) }
+                    if (remaining.isEmpty()) null else day.copy(events = remaining)
+                }
+            } else {
+                state.days
+            }
+            if (days.isEmpty()) {
                 AgendaEmpty(modifier)
             } else {
-                AgendaList(state = state, onEventClick = onEventClick, modifier = modifier)
+                AgendaList(
+                    days = days,
+                    today = state.today,
+                    dimPast = pastDisplay == PastEventDisplay.DIM,
+                    now = now,
+                    onEventClick = onEventClick,
+                    modifier = modifier,
+                )
             }
+        }
     }
 }
 
 @OptIn(ExperimentalFoundationApi::class)
 @Composable
 private fun AgendaList(
-    state: AgendaUiState.Success,
+    days: List<AgendaDay>,
+    today: LocalDate,
+    dimPast: Boolean,
+    now: Instant,
     onEventClick: (EventInstance) -> Unit,
     modifier: Modifier = Modifier,
 ) {
@@ -180,9 +336,9 @@ private fun AgendaList(
         // Bottom inset clears the FAB stack so the last row stays tappable.
         contentPadding = PaddingValues(top = 8.dp, bottom = 96.dp),
     ) {
-        state.days.forEach { day ->
+        days.forEach { day ->
             stickyHeader(key = "header-${day.date}") {
-                AgendaDayHeader(date = day.date, today = state.today)
+                AgendaDayHeader(date = day.date, today = today)
             }
             itemsIndexed(
                 items = day.events,
@@ -191,6 +347,7 @@ private fun AgendaList(
                 AgendaEventRow(
                     event = event,
                     position = positionOf(index, day.events.size),
+                    dimmed = dimPast && event.hasEnded(now),
                     modifier = calendarAnimateItem(),
                     onClick = { onEventClick(event) },
                 )
@@ -223,13 +380,14 @@ private fun AgendaDayHeader(date: LocalDate, today: LocalDate) {
 private fun AgendaEventRow(
     event: EventInstance,
     position: Position,
+    dimmed: Boolean,
     modifier: Modifier = Modifier,
     onClick: () -> Unit,
 ) {
     val dark = isSystemInDarkTheme()
     val title = event.title.ifBlank { stringResource(R.string.event_untitled) }
     GroupedRow(
-        modifier = modifier,
+        modifier = if (dimmed) modifier.alpha(EventDimAlpha) else modifier,
         title = title,
         summary = agendaTimeSummary(event),
         position = position,
@@ -254,7 +412,7 @@ private fun AgendaEmpty(modifier: Modifier = Modifier) {
         horizontalAlignment = Alignment.CenterHorizontally,
     ) {
         Icon(
-            imageVector = Icons.Filled.EventAvailable,
+            imageVector = Icons.Filled.Coffee,
             contentDescription = null,
             tint = MaterialTheme.colorScheme.onSurfaceVariant,
             modifier = Modifier.size(48.dp),
@@ -265,13 +423,6 @@ private fun AgendaEmpty(modifier: Modifier = Modifier) {
             style = MaterialTheme.typography.titleMedium,
             textAlign = TextAlign.Center,
         )
-        Spacer(Modifier.height(4.dp))
-        Text(
-            text = stringResource(R.string.agenda_empty_subtitle),
-            style = MaterialTheme.typography.bodyMedium,
-            color = MaterialTheme.colorScheme.onSurfaceVariant,
-            textAlign = TextAlign.Center,
-        )
     }
 }
 
@@ -338,15 +489,17 @@ private fun agendaTimeSummary(event: EventInstance): String {
     val time = if (event.isAllDay) {
         stringResource(R.string.event_detail_all_day)
     } else {
-        "${formatTime(event.start)} – ${formatTime(event.end)}"
+        val is24Hour = LocalUse24HourFormat.current
+        val locale = currentLocale()
+        "${formatTime(event.start, is24Hour, locale)} – ${formatTime(event.end, is24Hour, locale)}"
     }
     val location = event.location?.takeIf { it.isNotBlank() }
     return if (location != null) "$time · $location" else time
 }
 
-private fun formatTime(instant: Instant): String {
+private fun formatTime(instant: Instant, is24Hour: Boolean, locale: Locale): String {
     val t = instant.toLocalDateTime(zone).time
-    return "%02d:%02d".format(t.hour, t.minute)
+    return formatTimeOfDay(t.hour, t.minute, is24Hour, locale)
 }
 
 private fun formatAgendaDate(date: LocalDate): String {

app/src/main/java/de/jeanlucmakiola/calendula/ui/agenda/AgendaUiState.kt

@@ -53,5 +53,13 @@ sealed interface AgendaUiState {
         val anchor: LocalDate,
         val today: LocalDate,
         val days: List<AgendaDay>,
+        /** The range currently in effect — the saved default or a session override. */
+        val range: AgendaRange,
+        /** True when [range] is a temporary in-view override of the saved default. */
+        val rangeIsOverride: Boolean,
+        /** Last day the current [range] covers (inclusive), for the range header. */
+        val rangeEnd: LocalDate,
+        /** Whether to show the top range bar — header + switcher (toggle, on by default). */
+        val showRangeBar: Boolean,
     ) : AgendaUiState
 }

app/src/main/java/de/jeanlucmakiola/calendula/ui/agenda/AgendaViewModel.kt

@@ -5,6 +5,9 @@ import androidx.lifecycle.viewModelScope
 import dagger.hilt.android.lifecycle.HiltViewModel
 import de.jeanlucmakiola.calendula.data.calendar.CalendarRepository
 import de.jeanlucmakiola.calendula.data.di.IoDispatcher
+import de.jeanlucmakiola.calendula.data.prefs.PastEventDisplay
+import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
+import de.jeanlucmakiola.calendula.data.prefs.resolveFirstDay
 import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.EventInstance
 import de.jeanlucmakiola.calendula.domain.FailureReason
@@ -17,10 +20,13 @@ import kotlinx.coroutines.flow.catch
 import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.datetime.DateTimeUnit
+import kotlinx.datetime.DayOfWeek
 import kotlinx.datetime.LocalDate
 import kotlinx.datetime.TimeZone
+import java.util.Locale
 import kotlinx.datetime.atStartOfDayIn
 import kotlinx.datetime.atTime
 import kotlinx.datetime.plus
@@ -30,16 +36,36 @@ import kotlin.time.Clock
 import kotlin.time.Instant
 import javax.inject.Inject
 
-/** How far ahead the agenda loads events from its anchor day. */
-internal const val AGENDA_WINDOW_DAYS = 60
-
 @OptIn(ExperimentalCoroutinesApi::class)
 @HiltViewModel
 class AgendaViewModel @Inject constructor(
     private val repository: CalendarRepository,
+    settingsPrefs: SettingsPrefs,
     @IoDispatcher private val io: CoroutineDispatcher,
 ) : ViewModel() {
 
+    // The saved agenda range plus the range-bar visibility toggle.
+    private val agendaSettings = combine(
+        settingsPrefs.agendaScreenRange,
+        settingsPrefs.agendaShowRangeBar,
+    ) { range, showBar -> AgendaSettings(range, showBar) }
+
+    // First day of the week, for the calendar-aligned "this week" range.
+    private val weekStartDay = settingsPrefs.weekStart
+        .map { it.resolveFirstDay(Locale.getDefault()) }
+
+    /**
+     * How to treat events that already ended today (show / dim / hide). A display
+     * concern only, so it rides alongside the data state rather than re-querying;
+     * the screen combines it with a per-minute "now" to fade or drop past rows.
+     */
+    val pastEventDisplay: StateFlow<PastEventDisplay> = settingsPrefs.pastEventDisplay
+        .stateIn(
+            scope = viewModelScope,
+            started = SharingStarted.WhileSubscribed(5_000L),
+            initialValue = PastEventDisplay.SHOW,
+        )
+
     private val zone = TimeZone.currentSystemDefault()
 
     private val todayDate: LocalDate
@@ -48,14 +74,32 @@ class AgendaViewModel @Inject constructor(
     private val _anchor = MutableStateFlow(todayDate)
     val anchor: StateFlow<LocalDate> = _anchor
 
-    val state: StateFlow<AgendaUiState> = _anchor
-        .flatMapLatest { anchor ->
-            val range = agendaRange(anchor, AGENDA_WINDOW_DAYS, zone)
+    // A transient, in-view override of the saved agenda range. Held in memory
+    // (not persisted), so it survives view switches and rotation within the
+    // session but resets to the saved default when the app is relaunched.
+    private val _rangeOverride = MutableStateFlow<AgendaRange?>(null)
+
+    val state: StateFlow<AgendaUiState> =
+        combine(_anchor, agendaSettings, _rangeOverride, weekStartDay) { anchor, settings, override, weekStart ->
+            AgendaParams(
+                anchor = anchor,
+                range = override ?: settings.range,
+                rangeIsOverride = override != null && override != settings.range,
+                weekStart = weekStart,
+                showRangeBar = settings.showBar,
+            )
+        }
+        .flatMapLatest { params ->
+            val window = agendaRange(
+                params.anchor,
+                params.range.dayCount(params.anchor, params.weekStart) - 1,
+                zone,
+            )
             combine(
                 repository.calendars(),
-                repository.instances(range),
+                repository.instances(window),
             ) { calendars, instances ->
-                buildState(anchor, calendars, instances)
+                buildState(params, calendars, instances)
             }
         }
         .catch { emit(AgendaUiState.Failure(FailureReason.ProviderUnavailable)) }
@@ -75,16 +119,47 @@ class AgendaViewModel @Inject constructor(
         _anchor.value = date
     }
 
+    /** Temporarily override the agenda range for this session (the bottom-left pill). */
+    fun setRangeOverride(range: AgendaRange) {
+        _rangeOverride.value = range
+    }
+
+    private data class AgendaSettings(
+        val range: AgendaRange,
+        val showBar: Boolean,
+    )
+
+    private data class AgendaParams(
+        val anchor: LocalDate,
+        val range: AgendaRange,
+        val rangeIsOverride: Boolean,
+        val weekStart: DayOfWeek,
+        val showRangeBar: Boolean,
+    )
+
     private fun buildState(
-        anchor: LocalDate,
+        params: AgendaParams,
         calendars: List<CalendarSource>,
         instances: List<EventInstance>,
     ): AgendaUiState {
         if (calendars.isEmpty()) {
             return AgendaUiState.Failure(FailureReason.NoCalendarsConfigured)
         }
+        val anchor = params.anchor
         val days = groupAgendaDays(anchor, instances, zone)
-        return AgendaUiState.Success(anchor = anchor, today = todayDate, days = days)
+        val rangeEnd = anchor.plus(
+            params.range.dayCount(anchor, params.weekStart) - 1,
+            DateTimeUnit.DAY,
+        )
+        return AgendaUiState.Success(
+            anchor = anchor,
+            today = todayDate,
+            days = days,
+            range = params.range,
+            rangeIsOverride = params.rangeIsOverride,
+            rangeEnd = rangeEnd,
+            showRangeBar = params.showRangeBar,
+        )
     }
 }
 

app/src/main/java/de/jeanlucmakiola/calendula/ui/calendars/CalendarsScreen.kt

@@ -4,13 +4,17 @@ import android.accounts.AccountManager
 import android.content.Context
 import android.content.Intent
 import android.provider.Settings
+import android.text.format.DateUtils
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
 import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ColumnScope
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
@@ -26,25 +30,33 @@ import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material.icons.automirrored.filled.Notes
+import androidx.compose.material.icons.automirrored.filled.OpenInNew
 import androidx.compose.material.icons.filled.Add
 import androidx.compose.material.icons.filled.CalendarMonth
 import androidx.compose.material.icons.filled.Close
+import androidx.compose.material.icons.filled.Cloud
 import androidx.compose.material.icons.filled.Delete
-import androidx.compose.material.icons.filled.Edit
 import androidx.compose.material.icons.filled.FileDownload
-import androidx.compose.material.icons.filled.OpenInNew
+import androidx.compose.material.icons.filled.MoreVert
 import androidx.compose.material.icons.filled.Palette
+import androidx.compose.material.icons.filled.PhoneAndroid
+import androidx.compose.material.icons.filled.Schedule
+import androidx.compose.material.icons.filled.Visibility
+import androidx.compose.material.icons.filled.VisibilityOff
 import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.Button
+import androidx.compose.material3.DropdownMenu
+import androidx.compose.material3.DropdownMenuItem
 import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.OutlinedButton
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.SnackbarHost
 import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Surface
+import androidx.compose.material3.Switch
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
 import androidx.compose.material3.TopAppBar
@@ -58,20 +70,36 @@ import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.alpha
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.ImageBitmap
+import androidx.compose.ui.graphics.asImageBitmap
 import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.pluralStringResource
+import androidx.compose.ui.res.stringArrayResource
 import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.semantics.contentDescription
+import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.text.input.KeyboardCapitalization
 import androidx.compose.ui.unit.dp
+import androidx.core.graphics.drawable.toBitmap
+import androidx.core.net.toUri
+import androidx.documentfile.provider.DocumentFile
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import de.jeanlucmakiola.calendula.R
+import de.jeanlucmakiola.calendula.data.prefs.BackupStatus
+import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
 import de.jeanlucmakiola.calendula.domain.CalendarSource
-import de.jeanlucmakiola.calendula.ui.common.CALENDAR_COLOR_PALETTE
+import de.jeanlucmakiola.calendula.data.calendar.CalendarColorPalette
 import de.jeanlucmakiola.calendula.ui.common.CalendarColorChip
+import de.jeanlucmakiola.calendula.ui.common.DialogAmountField
+import de.jeanlucmakiola.calendula.ui.common.DialogUnitDropdown
+import de.jeanlucmakiola.calendula.ui.common.calendarCollapseExit
+import de.jeanlucmakiola.calendula.ui.common.calendarExpandEnter
 import de.jeanlucmakiola.calendula.ui.common.predictiveBack
 import de.jeanlucmakiola.calendula.ui.common.CollapsingScaffold
 import de.jeanlucmakiola.calendula.ui.common.ColorSwatchRow
@@ -79,7 +107,6 @@ import de.jeanlucmakiola.calendula.ui.common.GroupedRow
 import de.jeanlucmakiola.calendula.ui.common.InlineTextField
 import de.jeanlucmakiola.calendula.ui.common.Position
 import de.jeanlucmakiola.calendula.ui.common.pastelize
-import de.jeanlucmakiola.calendula.ui.common.positionOf
 import java.time.LocalDate
 
 /** Sentinel [editorId] meaning "the editor is composing a new calendar". */
@@ -98,8 +125,10 @@ fun CalendarsScreen(
     viewModel: CalendarsViewModel = hiltViewModel(),
 ) {
     val calendars by viewModel.calendars.collectAsStateWithLifecycle()
+    val disabledIds by viewModel.disabledCalendarIds.collectAsStateWithLifecycle()
     val error by viewModel.error.collectAsStateWithLifecycle()
     val backupResult by viewModel.backupResult.collectAsStateWithLifecycle()
+    val autoBackup by viewModel.autoBackup.collectAsStateWithLifecycle()
 
     // null = list; NEW_CALENDAR_ID = create; any other id = edit that calendar.
     // [editorSession] bumps on every open so the editor's field state resets for
@@ -113,7 +142,7 @@ fun CalendarsScreen(
             sessionKey = editorSession,
             isNew = editorId == NEW_CALENDAR_ID,
             initialName = editing?.displayName.orEmpty(),
-            initialColor = editing?.color ?: CALENDAR_COLOR_PALETTE.first(),
+            initialColor = editing?.color ?: CalendarColorPalette.all.first(),
             initialDescription = editing?.description.orEmpty(),
             onSave = { name, color, description ->
                 val id = editorId
@@ -134,14 +163,21 @@ fun CalendarsScreen(
         CalendarsList(
             local = calendars.filter { it.isLocal },
             synced = calendars.filterNot { it.isLocal },
+            disabledIds = disabledIds,
             error = error,
             onConsumeError = viewModel::consumeError,
             backupResult = backupResult,
             onExportBackup = viewModel::exportBackup,
             onConsumeBackupResult = viewModel::consumeBackupResult,
+            autoBackup = autoBackup,
+            onSetAutoBackupEnabled = viewModel::setAutoBackupEnabled,
+            onSetAutoBackupInterval = viewModel::setAutoBackupIntervalMinutes,
+            onSetAutoBackupFolder = viewModel::setAutoBackupFolder,
             onBack = onBack,
             onAdd = { editorSession++; editorId = NEW_CALENDAR_ID },
             onEdit = { calendar -> editorSession++; editorId = calendar.id },
+            onSetDisabled = viewModel::setDisabled,
+            onSetAccountDisabled = viewModel::setAccountDisabled,
         )
     }
 }
@@ -150,17 +186,28 @@ fun CalendarsScreen(
 private fun CalendarsList(
     local: List<CalendarSource>,
     synced: List<CalendarSource>,
+    disabledIds: Set<Long>,
     error: Boolean,
     onConsumeError: () -> Unit,
     backupResult: BackupResult?,
     onExportBackup: (android.net.Uri) -> Unit,
     onConsumeBackupResult: () -> Unit,
+    autoBackup: AutoBackupUiState,
+    onSetAutoBackupEnabled: (Boolean) -> Unit,
+    onSetAutoBackupInterval: (Long) -> Unit,
+    onSetAutoBackupFolder: (android.net.Uri) -> Unit,
     onBack: () -> Unit,
     onAdd: () -> Unit,
     onEdit: (CalendarSource) -> Unit,
+    onSetDisabled: (Long, Boolean) -> Unit,
+    onSetAccountDisabled: (Collection<Long>, Boolean) -> Unit,
 ) {
     val context = LocalContext.current
     val snackbarHostState = remember { SnackbarHostState() }
+    // Accounts the user has folded shut; empty = all expanded (keeps every
+    // calendar visible by default, the section is collapsible for tidiness).
+    var collapsedAccounts by remember { mutableStateOf(emptySet<String>()) }
+    var localExpanded by remember { mutableStateOf(true) }
     val writeErrorText = stringResource(R.string.calendars_write_error)
 
     LaunchedEffect(error) {
@@ -176,6 +223,13 @@ private fun CalendarsList(
         contract = ActivityResultContracts.CreateDocument("text/calendar"),
     ) { uri -> uri?.let(onExportBackup) }
 
+    // SAF folder picker for the automatic-backup destination; the VM persists the
+    // write grant so background runs can keep writing to it.
+    val pickFolder = rememberLauncherForActivityResult(
+        contract = ActivityResultContracts.OpenDocumentTree(),
+    ) { uri -> uri?.let(onSetAutoBackupFolder) }
+    var showInterval by remember { mutableStateOf(false) }
+
     val backupFailedText = stringResource(R.string.calendars_backup_failed)
     LaunchedEffect(backupResult) {
         when (val r = backupResult) {
@@ -200,36 +254,51 @@ private fun CalendarsList(
         onBack = onBack,
         snackbarHost = { SnackbarHost(snackbarHostState) },
     ) {
-        // Local (device-only) calendars — the calendars the app owns. The
-        // "Add calendar" entry closes the group as its final row.
-        SectionHeader(stringResource(R.string.calendars_local_header))
-        if (local.isEmpty()) {
-            HintText(stringResource(R.string.calendars_local_empty))
-        }
-        val localCount = local.size + 1
-        local.forEachIndexed { index, calendar ->
-            GroupedRow(
-                title = calendar.displayName,
-                summary = calendar.description,
-                position = positionOf(index, localCount),
-                leading = { CalendarColorChip(calendar.color) },
-                trailing = {
-                    Icon(
-                        Icons.Default.Edit,
-                        contentDescription = stringResource(R.string.calendars_edit_title),
-                        tint = MaterialTheme.colorScheme.onSurfaceVariant,
-                        modifier = Modifier.size(20.dp),
+        // What the per-calendar / per-account switches below actually do.
+        HintText(stringResource(R.string.calendars_disable_hint))
+
+        // Local (device-only) calendars — one collapsible group. The header's
+        // "+" adds a calendar; the switch enables/disables them all at once;
+        // tapping a calendar row opens its editor.
+        val localDisabled = local.isNotEmpty() && local.all { it.id in disabledIds }
+        CalendarGroup(
+            title = stringResource(R.string.calendars_local_header),
+            expanded = localExpanded,
+            bodyHasRows = local.isNotEmpty(),
+            headerDisabled = localDisabled,
+            leading = { Box(dimIf(localDisabled)) { LeadingAvatar(Icons.Default.PhoneAndroid) } },
+            manageIcon = Icons.Default.Add,
+            manageLabel = stringResource(R.string.calendars_add),
+            onManage = onAdd,
+            onToggleExpand = { localExpanded = !localExpanded },
+            showToggleAll = local.isNotEmpty(),
+            allEnabled = local.none { it.id in disabledIds },
+            onToggleAll = { enabled -> onSetAccountDisabled(local.map { it.id }, !enabled) },
+        ) {
+            if (local.isEmpty()) {
+                HintText(stringResource(R.string.calendars_local_empty))
+            } else {
+                local.forEachIndexed { index, calendar ->
+                    val disabled = calendar.id in disabledIds
+                    GroupedRow(
+                        title = calendar.displayName,
+                        summary = calendar.description,
+                        position = if (index == local.lastIndex) Position.Bottom else Position.Middle,
+                        container = MaterialTheme.colorScheme.surfaceContainerHighest,
+                        dimmed = disabled,
+                        leading = { CalendarColorChip(calendar.color, dimIf(disabled)) },
+                        trailing = {
+                            EnableSwitch(
+                                calendarName = calendar.displayName,
+                                enabled = !disabled,
+                                onToggle = { enabled -> onSetDisabled(calendar.id, !enabled) },
+                            )
+                        },
+                        onClick = { onEdit(calendar) },
                     )
-                },
-                onClick = { onEdit(calendar) },
-            )
+                }
+            }
         }
-        GroupedRow(
-            title = stringResource(R.string.calendars_add),
-            position = positionOf(local.size, localCount),
-            leading = { AddAvatar() },
-            onClick = onAdd,
-        )
 
         // Backup — local calendars have no sync, so a .ics export is their only
         // safety net. Offered only when there is something to back up.
@@ -237,42 +306,106 @@ private fun CalendarsList(
             Spacer(Modifier.height(16.dp))
             SectionHeader(stringResource(R.string.calendars_backup_header))
             HintText(stringResource(R.string.calendars_backup_hint))
+            // One connected card: the one-time export on top, then automatic
+            // backup (and its folder/interval rows when on).
             GroupedRow(
                 title = stringResource(R.string.calendars_backup_action),
-                position = Position.Alone,
+                position = Position.Top,
                 leading = { LeadingAvatar(Icons.Default.FileDownload) },
                 onClick = {
                     runCatching { createBackup.launch("calendula-backup-${LocalDate.now()}.ics") }
                 },
             )
+            GroupedRow(
+                title = stringResource(R.string.calendars_auto_backup),
+                summary = stringResource(R.string.calendars_auto_backup_hint),
+                position = if (autoBackup.enabled) Position.Middle else Position.Bottom,
+                leading = { LeadingAvatar(Icons.Default.Schedule) },
+                trailing = {
+                    Switch(checked = autoBackup.enabled, onCheckedChange = onSetAutoBackupEnabled)
+                },
+                onClick = { onSetAutoBackupEnabled(!autoBackup.enabled) },
+            )
+            if (autoBackup.enabled) {
+                GroupedRow(
+                    title = stringResource(R.string.calendars_auto_backup_folder),
+                    summary = rememberFolderName(autoBackup.folderUri)
+                        ?: stringResource(R.string.calendars_auto_backup_folder_unset),
+                    position = Position.Middle,
+                    onClick = { runCatching { pickFolder.launch(null) } },
+                )
+                GroupedRow(
+                    title = stringResource(R.string.calendars_auto_backup_interval),
+                    summary = backupIntervalLabel(autoBackup.intervalMinutes),
+                    position = Position.Bottom,
+                    onClick = { showInterval = true },
+                )
+                HintText(backupStatusText(autoBackup.status))
+            }
         }
 
         Spacer(Modifier.height(16.dp))
 
-        // Synced calendars — read-only, grouped by account, each with a
-        // per-account "manage in source app" link.
+        // Synced calendars — read-only, grouped by account. Each account is a
+        // collapsible group whose header opens the source app (icon) and toggles
+        // all of its calendars at once (switch).
         SectionHeader(stringResource(R.string.calendars_synced_header))
         HintText(stringResource(R.string.calendars_synced_hint))
         synced
             .groupBy { it.accountName.ifBlank { it.accountType } }
             .forEach { (account, cals) ->
-                AccountHeader(account = account, accountType = cals.first().accountType)
-                cals.forEachIndexed { index, calendar ->
-                    GroupedRow(
-                        title = calendar.displayName,
-                        position = positionOf(index, cals.size),
-                        leading = { CalendarColorChip(calendar.color) },
-                    )
+                val expanded = account !in collapsedAccounts
+                val accountType = cals.first().accountType
+                val accountDisabled = cals.all { it.id in disabledIds }
+                Spacer(Modifier.height(16.dp))
+                CalendarGroup(
+                    title = account,
+                    expanded = expanded,
+                    bodyHasRows = true,
+                    headerDisabled = accountDisabled,
+                    leading = { Box(dimIf(accountDisabled)) { SourceLogo(accountType) } },
+                    manageIcon = Icons.AutoMirrored.Filled.OpenInNew,
+                    manageLabel = stringResource(R.string.calendars_manage_in_app),
+                    onManage = {
+                        runCatching { context.startActivity(sourceAppIntent(context, accountType)) }
+                    },
+                    onToggleExpand = {
+                        collapsedAccounts = if (expanded) {
+                            collapsedAccounts + account
+                        } else {
+                            collapsedAccounts - account
+                        }
+                    },
+                    showToggleAll = true,
+                    allEnabled = cals.none { it.id in disabledIds },
+                    onToggleAll = { enabled -> onSetAccountDisabled(cals.map { it.id }, !enabled) },
+                ) {
+                    cals.forEachIndexed { index, calendar ->
+                        val disabled = calendar.id in disabledIds
+                        GroupedRow(
+                            title = calendar.displayName,
+                            position = if (index == cals.lastIndex) Position.Bottom else Position.Middle,
+                            container = MaterialTheme.colorScheme.surfaceContainerHighest,
+                            dimmed = disabled,
+                            leading = { CalendarColorChip(calendar.color, dimIf(disabled)) },
+                            trailing = {
+                                EnableSwitch(
+                                    calendarName = calendar.displayName,
+                                    enabled = !disabled,
+                                    onToggle = { enabled -> onSetDisabled(calendar.id, !enabled) },
+                                )
+                            },
+                        )
+                    }
                 }
             }
-        Spacer(Modifier.height(8.dp))
-        GroupedRow(
-            title = stringResource(R.string.calendars_add_account),
-            position = Position.Alone,
-            leading = { AddAvatar() },
-            onClick = {
-                runCatching { context.startActivity(Intent(Settings.ACTION_ADD_ACCOUNT)) }
-            },
+    }
+
+    if (showInterval) {
+        BackupIntervalDialog(
+            currentMinutes = autoBackup.intervalMinutes,
+            onConfirm = onSetAutoBackupInterval,
+            onDismiss = { showInterval = false },
         )
     }
 }
@@ -374,7 +507,7 @@ private fun CalendarEditor(
                 )
                 Spacer(Modifier.height(12.dp))
                 ColorSwatchRow(
-                    colors = CALENDAR_COLOR_PALETTE,
+                    colors = CalendarColorPalette.all,
                     selected = color,
                     onSelect = { color = it },
                     dark = dark,
@@ -424,6 +557,30 @@ private fun CalendarEditor(
     }
 }
 
+/**
+ * The per-row enable/disable control. Checked = the calendar is shown in the
+ * app; unchecking disables it (events, filters and pickers all drop it) without
+ * touching any provider data. Carries its own content description so the toggle
+ * is self-describing to screen readers even on a dimmed row.
+ */
+@Composable
+private fun EnableSwitch(
+    calendarName: String,
+    enabled: Boolean,
+    onToggle: (Boolean) -> Unit,
+) {
+    val label = stringResource(R.string.calendars_show_in_app_a11y, calendarName)
+    Switch(
+        checked = enabled,
+        onCheckedChange = onToggle,
+        modifier = Modifier.semantics { contentDescription = label },
+    )
+}
+
+/** Fade a leading element to the M3 disabled emphasis when [disabled]. */
+private fun dimIf(disabled: Boolean): Modifier =
+    if (disabled) Modifier.alpha(0.38f) else Modifier
+
 /** Tonal field card matching the event editor's design (icon + content). */
 @Composable
 private fun EditorCard(
@@ -455,32 +612,178 @@ private fun EditorCard(
     }
 }
 
+/**
+ * One collapsible calendar group rendered as a connected card. The header row is
+ * the card's top (tap to expand/collapse): a [leading] source mark (the account
+ * app's logo, or a device chip for local), the group [title] and a trailing
+ * overflow (⋮) menu holding the account-level actions — enable/disable every
+ * calendar at once (when [showToggleAll]) and the manage/add action
+ * ([manageIcon] / [manageLabel] → [onManage]). The group's calendars render as
+ * the rows below via [body].
+ *
+ * The header keeps the standard row colour; the calendars it reveals sit one tone
+ * darker, so the group reads as a header over nested content. Once [headerDisabled]
+ * (every calendar switched off) the header fades to the disabled emphasis so the
+ * whole group reads as off — not just via the menu. [bodyHasRows] is false when no
+ * calendar rows follow (e.g. an empty local group), so the header stays a
+ * standalone card rather than a top edge with nothing beneath it.
+ */
 @Composable
-private fun AccountHeader(account: String, accountType: String) {
-    val context = LocalContext.current
-    Row(
-        modifier = Modifier
-            .fillMaxWidth()
-            .padding(start = 28.dp, end = 16.dp, top = 16.dp, bottom = 4.dp),
-        verticalAlignment = Alignment.CenterVertically,
+private fun CalendarGroup(
+    title: String,
+    expanded: Boolean,
+    bodyHasRows: Boolean,
+    headerDisabled: Boolean,
+    leading: @Composable () -> Unit,
+    manageIcon: ImageVector,
+    manageLabel: String,
+    onManage: () -> Unit,
+    onToggleExpand: () -> Unit,
+    showToggleAll: Boolean,
+    allEnabled: Boolean,
+    onToggleAll: (Boolean) -> Unit,
+    body: @Composable ColumnScope.() -> Unit,
+) {
+    GroupedRow(
+        title = title,
+        position = if (expanded && bodyHasRows) Position.Top else Position.Alone,
+        dimmed = headerDisabled,
+        leading = leading,
+        trailing = {
+            CalendarGroupMenu(
+                title = title,
+                showToggleAll = showToggleAll,
+                allEnabled = allEnabled,
+                onToggleAll = onToggleAll,
+                manageIcon = manageIcon,
+                manageLabel = manageLabel,
+                onManage = onManage,
+            )
+        },
+        onClick = onToggleExpand,
+    )
+    AnimatedVisibility(
+        visible = expanded,
+        enter = calendarExpandEnter(),
+        exit = calendarCollapseExit(),
     ) {
-        Text(
-            text = account,
-            style = MaterialTheme.typography.titleSmall,
-            fontWeight = FontWeight.SemiBold,
-            modifier = Modifier.weight(1f),
-        )
-        OutlinedButton(onClick = {
-            runCatching { context.startActivity(sourceAppIntent(context, accountType)) }
-        }) {
-            Icon(Icons.Default.OpenInNew, contentDescription = null, modifier = Modifier.size(16.dp))
-            Spacer(Modifier.width(6.dp))
-            Text(stringResource(R.string.calendars_manage_in_app))
+        Column(content = body)
+    }
+}
+
+/**
+ * The account header's overflow (⋮) menu: the two account-level actions that
+ * don't fit on one line — "Enable/Disable all" (when [showToggleAll]) and the
+ * manage/add action. A rounded, tonal dropdown matching the app's surfaces, with
+ * the two actions divided for clear separation.
+ */
+@Composable
+private fun CalendarGroupMenu(
+    title: String,
+    showToggleAll: Boolean,
+    allEnabled: Boolean,
+    onToggleAll: (Boolean) -> Unit,
+    manageIcon: ImageVector,
+    manageLabel: String,
+    onManage: () -> Unit,
+) {
+    var open by remember { mutableStateOf(false) }
+    Box {
+        IconButton(onClick = { open = true }) {
+            Icon(
+                Icons.Default.MoreVert,
+                contentDescription = stringResource(R.string.calendars_account_menu_a11y, title),
+            )
+        }
+        DropdownMenu(
+            expanded = open,
+            onDismissRequest = { open = false },
+            shape = RoundedCornerShape(20.dp),
+            // A distinct tone + a lifted shadow so the menu reads as floating
+            // above the cards (which sit at surfaceContainerHigh) rather than
+            // blending into them.
+            containerColor = MaterialTheme.colorScheme.surfaceContainerLowest,
+            tonalElevation = 0.dp,
+            shadowElevation = 6.dp,
+        ) {
+            if (showToggleAll) {
+                DropdownMenuItem(
+                    text = {
+                        Text(
+                            stringResource(
+                                if (allEnabled) R.string.calendars_disable_all
+                                else R.string.calendars_enable_all,
+                            ),
+                        )
+                    },
+                    leadingIcon = {
+                        Icon(
+                            if (allEnabled) Icons.Default.VisibilityOff else Icons.Default.Visibility,
+                            contentDescription = null,
+                        )
+                    },
+                    onClick = {
+                        open = false
+                        onToggleAll(!allEnabled)
+                    },
+                )
+                HorizontalDivider(Modifier.padding(horizontal = 12.dp, vertical = 4.dp))
+            }
+            DropdownMenuItem(
+                text = { Text(manageLabel) },
+                leadingIcon = { Icon(manageIcon, contentDescription = null) },
+                onClick = {
+                    open = false
+                    onManage()
+                },
+            )
         }
     }
 }
 
-/** Neutral circular chip carrying an arbitrary icon — matches [AddAvatar]'s shape. */
+/**
+ * The source app's launcher icon (Google Calendar, DAVx5, Nextcloud, …) as a
+ * round 40dp chip, so each synced account is recognisable at a glance. We load
+ * whatever app owns the account from [PackageManager] rather than bundling brand
+ * logos — always accurate, nothing to license. Falls back to a neutral cloud
+ * chip when no installed app resolves for the account.
+ */
+@Composable
+private fun SourceLogo(accountType: String) {
+    val context = LocalContext.current
+    val logo = remember(accountType) { sourceAppLogo(context, accountType) }
+    if (logo != null) {
+        Image(
+            bitmap = logo,
+            contentDescription = null,
+            contentScale = ContentScale.Crop,
+            modifier = Modifier
+                .size(40.dp)
+                .clip(CircleShape),
+        )
+    } else {
+        LeadingAvatar(Icons.Default.Cloud)
+    }
+}
+
+/** The launcher icon of the app backing [accountType], preferring the human-facing app. */
+private fun sourceAppLogo(context: Context, accountType: String): ImageBitmap? {
+    val pm = context.packageManager
+    val candidates = buildList {
+        curatedSourcePackage(accountType)?.let { add(it) }
+        AccountManager.get(context).authenticatorTypes
+            .firstOrNull { it.type.equals(accountType, ignoreCase = true) }
+            ?.packageName
+            ?.let { add(it) }
+    }
+    for (pkg in candidates) {
+        val bitmap = runCatching { pm.getApplicationIcon(pkg).toBitmap() }.getOrNull()
+        if (bitmap != null) return bitmap.asImageBitmap()
+    }
+    return null
+}
+
+/** Neutral circular chip carrying an arbitrary icon (e.g. the local-device mark). */
 @Composable
 private fun LeadingAvatar(icon: ImageVector) {
     Box(
@@ -499,25 +802,6 @@ private fun LeadingAvatar(icon: ImageVector) {
     }
 }
 
-/** Neutral circular chip with a "+" — the leading icon for add-actions. */
-@Composable
-private fun AddAvatar() {
-    Box(
-        modifier = Modifier
-            .size(40.dp)
-            .clip(CircleShape)
-            .background(MaterialTheme.colorScheme.surfaceContainerHighest),
-        contentAlignment = Alignment.Center,
-    ) {
-        Icon(
-            Icons.Default.Add,
-            contentDescription = null,
-            tint = MaterialTheme.colorScheme.onSurfaceVariant,
-            modifier = Modifier.size(22.dp),
-        )
-    }
-}
-
 @Composable
 private fun SectionHeader(text: String) {
     Text(
@@ -538,6 +822,95 @@ private fun HintText(text: String) {
     )
 }
 
+/** Readable name of the persisted backup folder, resolved from its tree Uri. */
+@Composable
+private fun rememberFolderName(uriString: String?): String? {
+    val context = LocalContext.current
+    return remember(uriString) {
+        uriString?.let {
+            runCatching { DocumentFile.fromTreeUri(context, it.toUri())?.name }.getOrNull()
+        }
+    }
+}
+
+/** "Every 30 minutes" / "Every 2 hours" / "Every day" — the interval in its largest whole unit. */
+@Composable
+private fun backupIntervalLabel(minutes: Long): String {
+    val duration = when {
+        minutes % MINUTES_PER_WEEK == 0L ->
+            pluralStringResource(R.plurals.duration_weeks, (minutes / MINUTES_PER_WEEK).toInt(), (minutes / MINUTES_PER_WEEK).toInt())
+        minutes % MINUTES_PER_DAY == 0L ->
+            pluralStringResource(R.plurals.duration_days, (minutes / MINUTES_PER_DAY).toInt(), (minutes / MINUTES_PER_DAY).toInt())
+        minutes % 60L == 0L ->
+            pluralStringResource(R.plurals.duration_hours, (minutes / 60L).toInt(), (minutes / 60L).toInt())
+        else ->
+            pluralStringResource(R.plurals.duration_minutes, minutes.toInt(), minutes.toInt())
+    }
+    return stringResource(R.string.calendars_auto_backup_every, duration)
+}
+
+/** "Last backup: 5 minutes ago" / "… failed" / "No automatic backup yet". */
+@Composable
+private fun backupStatusText(status: BackupStatus): String {
+    if (status.lastRun == 0L) return stringResource(R.string.calendars_auto_backup_status_never)
+    val relative = DateUtils.getRelativeTimeSpanString(
+        status.lastRun, System.currentTimeMillis(), DateUtils.MINUTE_IN_MILLIS,
+    ).toString()
+    return if (status.lastSuccess) {
+        stringResource(R.string.calendars_auto_backup_status_ok, relative)
+    } else {
+        stringResource(R.string.calendars_auto_backup_status_failed, relative)
+    }
+}
+
+/** Amount + unit picker for the backup interval (floored at 30 minutes). */
+@Composable
+private fun BackupIntervalDialog(
+    currentMinutes: Long,
+    onConfirm: (Long) -> Unit,
+    onDismiss: () -> Unit,
+) {
+    // minutes-per-unit for each entry; pick the largest unit the current value divides into.
+    val unitMinutes = remember { listOf(1L, 60L, MINUTES_PER_DAY, MINUTES_PER_WEEK) }
+    val units = stringArrayResource(R.array.backup_interval_units).toList()
+    val initialUnit = unitMinutes.indexOfLast { currentMinutes % it == 0L }.coerceAtLeast(0)
+    var amount by rememberSaveable { mutableStateOf((currentMinutes / unitMinutes[initialUnit]).toString()) }
+    var unitIndex by rememberSaveable { mutableStateOf(initialUnit) }
+
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = { Text(stringResource(R.string.calendars_auto_backup_interval)) },
+        text = {
+            Column {
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    DialogAmountField(value = amount, onValueChange = { amount = it }, placeholder = "1")
+                    Spacer(Modifier.width(12.dp))
+                    DialogUnitDropdown(label = units[unitIndex], entries = units) { unitIndex = it }
+                }
+                Spacer(Modifier.height(8.dp))
+                Text(
+                    text = stringResource(R.string.calendars_auto_backup_interval_min),
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+            }
+        },
+        confirmButton = {
+            TextButton(onClick = {
+                val value = amount.toLongOrNull()?.coerceAtLeast(1L) ?: 1L
+                onConfirm((value * unitMinutes[unitIndex]).coerceAtLeast(SettingsPrefs.MIN_BACKUP_INTERVAL))
+                onDismiss()
+            }) { Text(stringResource(R.string.reminder_custom_set)) }
+        },
+        dismissButton = {
+            TextButton(onClick = onDismiss) { Text(stringResource(R.string.dialog_cancel)) }
+        },
+    )
+}
+
+private const val MINUTES_PER_DAY = 1_440L
+private const val MINUTES_PER_WEEK = 10_080L
+
 /**
  * Pick the app to open for managing a synced calendar's account. The account's
  * own authenticator package (resolved from [AccountManager], no permission

app/src/main/java/de/jeanlucmakiola/calendula/ui/calendars/CalendarsViewModel.kt

@@ -1,12 +1,19 @@
 package de.jeanlucmakiola.calendula.ui.calendars
 
+import android.content.Context
+import android.content.Intent
 import android.net.Uri
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import dagger.hilt.android.lifecycle.HiltViewModel
+import dagger.hilt.android.qualifiers.ApplicationContext
+import de.jeanlucmakiola.calendula.data.backup.BackupScheduler
 import de.jeanlucmakiola.calendula.data.calendar.CalendarRepository
 import de.jeanlucmakiola.calendula.data.di.IoDispatcher
 import de.jeanlucmakiola.calendula.data.ics.IcsExporter
+import de.jeanlucmakiola.calendula.data.prefs.BackupStatus
+import de.jeanlucmakiola.calendula.data.prefs.CalendarPrefs
+import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
 import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.ics.IcsWriter
 import kotlinx.coroutines.CoroutineDispatcher
@@ -15,6 +22,8 @@ import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.catch
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
@@ -31,8 +40,11 @@ import javax.inject.Inject
  */
 @HiltViewModel
 class CalendarsViewModel @Inject constructor(
+    @ApplicationContext private val context: Context,
     private val repository: CalendarRepository,
     private val icsExporter: IcsExporter,
+    private val prefs: CalendarPrefs,
+    private val settingsPrefs: SettingsPrefs,
     @IoDispatcher private val io: CoroutineDispatcher,
 ) : ViewModel() {
 
@@ -46,6 +58,36 @@ class CalendarsViewModel @Inject constructor(
                 initialValue = emptyList(),
             )
 
+    /**
+     * Calendars the user has disabled in the app. This screen is the only
+     * surface that lists them, so it both reads the set (to dim the rows) and
+     * toggles it. Every other surface simply excludes these ids.
+     */
+    val disabledCalendarIds: StateFlow<Set<Long>> =
+        prefs.disabledCalendarIds
+            .flowOn(io)
+            .stateIn(
+                scope = viewModelScope,
+                started = SharingStarted.WhileSubscribed(5_000L),
+                initialValue = emptySet(),
+            )
+
+    /** Automatic-backup settings + last-run status, for the Backup section UI. */
+    val autoBackup: StateFlow<AutoBackupUiState> = combine(
+        settingsPrefs.autoBackupEnabled,
+        settingsPrefs.autoBackupIntervalMinutes,
+        settingsPrefs.autoBackupFolderUri,
+        settingsPrefs.autoBackupStatus,
+    ) { enabled, interval, folder, status ->
+        AutoBackupUiState(enabled, interval, folder, status)
+    }
+        .flowOn(io)
+        .stateIn(
+            scope = viewModelScope,
+            started = SharingStarted.WhileSubscribed(5_000L),
+            initialValue = AutoBackupUiState(),
+        )
+
     private val _error = MutableStateFlow(false)
     val error: StateFlow<Boolean> = _error.asStateFlow()
 
@@ -93,6 +135,76 @@ class CalendarsViewModel @Inject constructor(
         repository.deleteCalendar(id)
     }
 
+    /**
+     * Enable or disable a calendar app-side. Disabling removes it from every
+     * surface but Settings → Calendars (and hides its events) without touching
+     * provider data — purely a reversible Calendula-local view choice.
+     */
+    fun setDisabled(id: Long, disabled: Boolean) {
+        viewModelScope.launch {
+            val current = prefs.disabledCalendarIds.first()
+            val next = if (disabled) current + id else current - id
+            if (next != current) prefs.setDisabledCalendarIds(next)
+        }
+    }
+
+    /**
+     * Enable or disable every calendar of one account in a single write — the
+     * "toggle all" affordance on an account header. Done as one set update so the
+     * per-calendar [setDisabled] calls can't race each other.
+     */
+    fun setAccountDisabled(ids: Collection<Long>, disabled: Boolean) {
+        viewModelScope.launch {
+            val current = prefs.disabledCalendarIds.first()
+            val next = if (disabled) current + ids else current - ids.toSet()
+            if (next != current) prefs.setDisabledCalendarIds(next)
+        }
+    }
+
+    // --- Automatic backup (issue #8) ------------------------------------
+
+    fun setAutoBackupEnabled(enabled: Boolean) {
+        viewModelScope.launch {
+            settingsPrefs.setAutoBackupEnabled(enabled)
+            reschedule()
+            // Give immediate feedback when turning it on with a folder already set.
+            if (enabled && settingsPrefs.autoBackupFolderUri.first() != null) {
+                BackupScheduler.runNow(context)
+            }
+        }
+    }
+
+    fun setAutoBackupIntervalMinutes(minutes: Long) {
+        viewModelScope.launch {
+            settingsPrefs.setAutoBackupIntervalMinutes(minutes)
+            reschedule()
+        }
+    }
+
+    /** Persist the chosen destination folder (taking a durable write grant) and run once. */
+    fun setAutoBackupFolder(uri: Uri) {
+        viewModelScope.launch {
+            runCatching {
+                context.contentResolver.takePersistableUriPermission(
+                    uri,
+                    Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION,
+                )
+            }
+            settingsPrefs.setAutoBackupFolderUri(uri.toString())
+            reschedule()
+            if (settingsPrefs.autoBackupEnabled.first()) BackupScheduler.runNow(context)
+        }
+    }
+
+    private suspend fun reschedule() {
+        BackupScheduler.apply(
+            context = context,
+            enabled = settingsPrefs.autoBackupEnabled.first(),
+            intervalMinutes = settingsPrefs.autoBackupIntervalMinutes.first(),
+            hasFolder = settingsPrefs.autoBackupFolderUri.first() != null,
+        )
+    }
+
     private inline fun write(crossinline block: suspend () -> Unit) {
         viewModelScope.launch {
             try {
@@ -106,6 +218,14 @@ class CalendarsViewModel @Inject constructor(
     }
 }
 
+/** Automatic-backup settings + last-run status for the Backup section. */
+data class AutoBackupUiState(
+    val enabled: Boolean = false,
+    val intervalMinutes: Long = SettingsPrefs.DEFAULT_BACKUP_INTERVAL,
+    val folderUri: String? = null,
+    val status: BackupStatus = BackupStatus(lastRun = 0L, lastSuccess = true, consecutiveFailures = 0),
+)
+
 /** Outcome of a whole-calendar backup, surfaced once to the screen. */
 sealed interface BackupResult {
     data class Success(val eventCount: Int) : BackupResult

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/ColorSwatchRow.kt

@@ -67,16 +67,3 @@ fun ColorSwatchRow(
         }
     }
 }
-
-/** Google-Calendar-style palette; ARGB ints for a raw `CALENDAR_COLOR` / `EVENT_COLOR`. */
-val CALENDAR_COLOR_PALETTE: List<Int> = listOf(
-    0xFFD50000, // red
-    0xFFE67C00, // orange
-    0xFFF6BF26, // amber
-    0xFF33B679, // green
-    0xFF0B8043, // dark green
-    0xFF039BE5, // blue
-    0xFF3F51B5, // indigo
-    0xFF8E24AA, // purple
-    0xFF616161, // graphite
-).map { it.toInt() }

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/DebugRibbon.kt

@@ -0,0 +1,50 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.BoxScope
+import androidx.compose.foundation.layout.offset
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.rotate
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.compose.ui.zIndex
+
+/**
+ * A Flutter-style "DEBUG" corner ribbon, drawn across the top-right corner of
+ * the app. Deliberately a stark, un-themed marker (not a product component) so a
+ * debug build is unmistakable at a glance — gate it on `BuildConfig.DEBUG` at the
+ * call site so it never reaches a release build. Non-interactive: it's a plain
+ * label with no pointer handler, so taps fall through to whatever is beneath it.
+ *
+ * Drop it in as the last child of a full-screen [androidx.compose.foundation.layout.Box]
+ * so it overlays the UI.
+ */
+@Composable
+fun BoxScope.DebugRibbon() {
+    Text(
+        text = "DEBUG",
+        color = Color.White,
+        fontSize = 10.sp,
+        fontWeight = FontWeight.Bold,
+        letterSpacing = 1.sp,
+        textAlign = TextAlign.Center,
+        modifier = Modifier
+            .align(Alignment.TopEnd)
+            .zIndex(1f)
+            // Push the band out so its midline crosses the very corner, then
+            // rotate it to the classic 45° ribbon.
+            .offset(x = 36.dp, y = 24.dp)
+            .rotate(45f)
+            .background(Color(0xFFB23B00))
+            .width(140.dp)
+            .padding(vertical = 2.dp),
+    )
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/EventFormFieldVisuals.kt

@@ -0,0 +1,44 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.annotation.StringRes
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.Notes
+import androidx.compose.material.icons.filled.EventAvailable
+import androidx.compose.material.icons.filled.Lock
+import androidx.compose.material.icons.filled.Notifications
+import androidx.compose.material.icons.filled.Palette
+import androidx.compose.material.icons.filled.People
+import androidx.compose.material.icons.filled.Place
+import androidx.compose.material.icons.filled.Repeat
+import androidx.compose.ui.graphics.vector.ImageVector
+import de.jeanlucmakiola.calendula.R
+import de.jeanlucmakiola.calendula.domain.EventFormField
+
+/**
+ * The shared label and icon for each optional [EventFormField]. Both the event
+ * editor (which shows these fields) and the settings screen (which toggles their
+ * defaults) draw from this one mapping, so a field reads the same wherever it
+ * appears.
+ */
+@StringRes
+fun eventFormFieldLabel(field: EventFormField): Int = when (field) {
+    EventFormField.Location -> R.string.event_detail_location
+    EventFormField.Description -> R.string.event_detail_description
+    EventFormField.Reminders -> R.string.event_detail_reminders
+    EventFormField.Recurrence -> R.string.event_detail_recurrence
+    EventFormField.Availability -> R.string.event_edit_availability
+    EventFormField.Visibility -> R.string.event_edit_visibility
+    EventFormField.Color -> R.string.event_edit_color
+    EventFormField.Attendees -> R.string.event_edit_attendees
+}
+
+fun eventFormFieldIcon(field: EventFormField): ImageVector = when (field) {
+    EventFormField.Location -> Icons.Default.Place
+    EventFormField.Description -> Icons.AutoMirrored.Filled.Notes
+    EventFormField.Reminders -> Icons.Default.Notifications
+    EventFormField.Recurrence -> Icons.Default.Repeat
+    EventFormField.Availability -> Icons.Default.EventAvailable
+    EventFormField.Visibility -> Icons.Default.Lock
+    EventFormField.Color -> Icons.Default.Palette
+    EventFormField.Attendees -> Icons.Default.People
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/GroupedList.kt

@@ -127,7 +127,9 @@ fun CollapsingScaffold(
  * One row in a grouped list: an M3 [ListItem] over a tonal [Surface] whose
  * corner radii come from its [position] (so a run of rows reads as a single
  * rounded card). Corners round further on press. A null [onClick] makes the
- * row non-interactive (e.g. read-only entries).
+ * row non-interactive (e.g. read-only entries). [dimmed] fades the headline and
+ * summary to the M3 disabled emphasis while leaving the [trailing] control at
+ * full opacity — for rows that are present but switched off.
  */
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -137,6 +139,8 @@ fun GroupedRow(
     modifier: Modifier = Modifier,
     summary: String? = null,
     selected: Boolean = false,
+    dimmed: Boolean = false,
+    container: Color? = null,
     minHeight: Dp = 72.dp,
     leading: @Composable (() -> Unit)? = null,
     trailing: @Composable (() -> Unit)? = null,
@@ -168,6 +172,16 @@ fun GroupedRow(
             supportingColor = MaterialTheme.colorScheme.onSecondaryContainer,
             trailingIconColor = MaterialTheme.colorScheme.onSecondaryContainer,
         )
+    } else if (dimmed) {
+        // M3 disabled emphasis (0.38α) on the text/leading; the trailing control
+        // stays full-opacity so the toggle reads as live even on a faded row.
+        val muted = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.38f)
+        ListItemDefaults.colors(
+            containerColor = Color.Transparent,
+            headlineColor = muted,
+            leadingIconColor = muted,
+            supportingColor = muted,
+        )
     } else {
         ListItemDefaults.colors(containerColor = Color.Transparent)
     }
@@ -185,10 +199,10 @@ fun GroupedRow(
         .fillMaxWidth()
         .padding(horizontal = 16.dp)
         .then(gap)
-    val containerColor = if (selected) {
-        MaterialTheme.colorScheme.secondaryContainer
-    } else {
-        MaterialTheme.colorScheme.surfaceContainerHigh
+    val containerColor = when {
+        selected -> MaterialTheme.colorScheme.secondaryContainer
+        container != null -> container
+        else -> MaterialTheme.colorScheme.surfaceContainerHigh
     }
     if (onClick != null) {
         Surface(

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/HourLines.kt

@@ -0,0 +1,38 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.runtime.staticCompositionLocalOf
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.drawBehind
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.graphics.Color
+
+/**
+ * Whether the week/day timeline draws an hour separator line, from the
+ * `showHourLines` preference. Provided once at the app root (like
+ * [LocalUse24HourFormat]) so the timeline reads it without ViewModel plumbing.
+ * Defaults to off — the historical clean look.
+ */
+val LocalShowHourLines = staticCompositionLocalOf { false }
+
+/**
+ * Draw a faint separator line at the top of each hour (1..23) when [show] is
+ * true. Applied to a day column's content so each line sits over the column's
+ * background but beneath the event blocks. [hourHeightPx] is one hour's pixel
+ * height; [color] is resolved by the caller from the theme.
+ */
+fun Modifier.hourSeparatorLines(show: Boolean, hourHeightPx: Float, color: Color): Modifier =
+    if (!show) {
+        this
+    } else {
+        drawBehind {
+            for (hour in 1 until 24) {
+                val y = hour * hourHeightPx
+                drawLine(
+                    color = color,
+                    start = Offset(0f, y),
+                    end = Offset(size.width, y),
+                    strokeWidth = 1f,
+                )
+            }
+        }
+    }

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/InlineTextField.kt

@@ -36,6 +36,7 @@ fun InlineTextField(
     textStyle: TextStyle = MaterialTheme.typography.titleMedium,
     singleLine: Boolean = true,
     minLines: Int = 1,
+    enabled: Boolean = true,
     keyboardType: KeyboardType = KeyboardType.Text,
     capitalization: KeyboardCapitalization = KeyboardCapitalization.None,
     imeAction: ImeAction = ImeAction.Default,
@@ -43,15 +44,17 @@ fun InlineTextField(
     onImeAction: (() -> Unit)? = null,
 ) {
     val resolvedStyle = textStyle.copy(
-        color = if (textStyle.color.isSpecified) {
-            textStyle.color
-        } else {
-            MaterialTheme.colorScheme.onSurface
+        color = when {
+            // A disabled field reads as dimmed, like a locked value.
+            !enabled -> MaterialTheme.colorScheme.onSurfaceVariant
+            textStyle.color.isSpecified -> textStyle.color
+            else -> MaterialTheme.colorScheme.onSurface
         },
     )
     BasicTextField(
         value = value,
         onValueChange = onValueChange,
+        enabled = enabled,
         textStyle = resolvedStyle,
         singleLine = singleLine,
         minLines = minLines,

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/NowLine.kt

@@ -34,7 +34,7 @@ private val LineThickness = 2.dp
  * the middle of a minute. Drives the "now" line in the day/week grids.
  */
 @Composable
-private fun rememberCurrentMinute(): State<Instant> {
+fun rememberCurrentMinute(): State<Instant> {
     val instant = remember { mutableStateOf(Clock.System.now()) }
     LaunchedEffect(Unit) {
         while (true) {

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/PastEvents.kt

@@ -0,0 +1,16 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.runtime.compositionLocalOf
+import kotlin.time.Instant
+
+/**
+ * The cut-off instant before which a calendar event counts as "completed" and is
+ * drawn dimmed in the month/week grids — i.e. the current wall-clock minute when
+ * the "dim completed events" setting is on, or `null` when it is off (nothing
+ * dims). Provided per grid screen so only the event chips that read it recompose
+ * as the minute ticks, mirroring [LocalShowHourLines] / [LocalUse24HourFormat].
+ */
+val LocalDimCutoff = compositionLocalOf<Instant?> { null }
+
+/** Opacity applied to a completed/past event chip when it is dimmed. */
+const val EventDimAlpha = 0.4f

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/Picker.kt

@@ -7,11 +7,13 @@ import androidx.compose.foundation.layout.ColumnScope
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Check
+import androidx.compose.material3.Checkbox
 import androidx.compose.material3.FilledTonalButton
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
@@ -25,11 +27,13 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.SideEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalView
+import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.window.Dialog
@@ -37,6 +41,7 @@ import androidx.compose.ui.window.DialogProperties
 import androidx.compose.ui.window.DialogWindowProvider
 import de.jeanlucmakiola.calendula.R
 import de.jeanlucmakiola.calendula.data.prefs.CalendarReminderOverride
+import de.jeanlucmakiola.calendula.ui.agenda.AgendaRange
 
 /**
  * Shared full-screen scaffold for selection pickers: a full-bleed [Dialog] that
@@ -83,8 +88,10 @@ fun <T> OptionPicker(
     label: @Composable (T) -> String,
     onSelect: (T) -> Unit,
     onDismiss: () -> Unit,
+    header: (@Composable ColumnScope.() -> Unit)? = null,
 ) {
     FullScreenPicker(title = title, onDismiss = onDismiss) {
+        header?.invoke(this)
         options.forEachIndexed { index, option ->
             val isSelected = option == selected
             GroupedRow(
@@ -106,10 +113,15 @@ fun <T> OptionPicker(
 }
 
 /**
- * Reminder-default picker, full-screen: the grouped list (with an optional "Use
- * default reminder" row and a "None" row), the [presets] as lead-time rows, and
- * a "Custom" row that expands an inline number field plus a segmented unit
- * selector. Returns the choice as a [CalendarReminderOverride].
+ * Reminder-default picker, full-screen and **multi-select**: each [presets]
+ * lead time (plus any chosen custom value) is a checkbox row that toggles
+ * independently, so a default can carry several reminders ("1 week before" *and*
+ * "on the day"). A per-calendar picker ([allowInherit]) gains an exclusive "Use
+ * default reminder" row above the list; choosing it defers to the global default
+ * and clears the checked times. With nothing checked and inherit off, the choice
+ * is [CalendarReminderOverride.None] (an explicit no-reminder). A "Custom" row
+ * expands an inline number field plus a unit selector to add an arbitrary lead
+ * time to the set. Changes apply live via [onSelect]; the user leaves via back.
  */
 @Composable
 fun ReminderDefaultPicker(
@@ -120,57 +132,74 @@ fun ReminderDefaultPicker(
     onSelect: (CalendarReminderOverride) -> Unit,
     onDismiss: () -> Unit,
 ) {
-    val selectedMinutes = (selected as? CalendarReminderOverride.Minutes)?.minutes
-    val customSelected = selectedMinutes != null && selectedMinutes !in presets
-    val seed = decomposeReminder(selectedMinutes?.takeIf { customSelected })
+    // Optimistic local state: the chosen override is authoritative while the
+    // picker is open, so quick successive toggles compose on each other instead
+    // of racing the round-trip through the settings flow (which would drop a
+    // toggle made before the previous write echoes back). Seeded once on open;
+    // the picker leaves composition on dismiss, so reopening re-reads [selected].
+    var current by remember { mutableStateOf(selected) }
+    val inherits = current is CalendarReminderOverride.Inherit
+    val selectedMinutes = (current as? CalendarReminderOverride.Minutes)?.minutes.orEmpty()
+    // Presets plus any selected custom (non-preset) values, each as its own row.
+    val rows = presets + selectedMinutes.filter { it !in presets }.sorted()
 
     var customExpanded by rememberSaveable { mutableStateOf(false) }
-    var amountText by rememberSaveable { mutableStateOf(seed.first) }
-    var unit by rememberSaveable { mutableStateOf(seed.second) }
+    var amountText by rememberSaveable { mutableStateOf("") }
+    var unit by rememberSaveable { mutableStateOf(ReminderUnit.Minutes) }
 
-    val options = buildList {
-        if (allowInherit) add(CalendarReminderOverride.Inherit)
-        add(CalendarReminderOverride.None)
-        presets.forEach { add(CalendarReminderOverride.Minutes(it)) }
+    fun apply(override: CalendarReminderOverride) {
+        current = override
+        onSelect(override)
     }
-    val rowCount = options.size + 1 // + the custom row
+    // Emit the override for a new set of minutes: empty collapses to None, which
+    // (with inherit unchosen) reads as an explicit "no reminder".
+    fun emit(minutes: List<Int>) {
+        val norm = minutes.distinct().sorted()
+        apply(
+            if (norm.isEmpty()) {
+                CalendarReminderOverride.None
+            } else {
+                CalendarReminderOverride.Minutes(norm)
+            },
+        )
+    }
+    fun toggle(minute: Int) =
+        emit(if (minute in selectedMinutes) selectedMinutes - minute else selectedMinutes + minute)
 
     FullScreenPicker(title = title, onDismiss = onDismiss) {
-        options.forEachIndexed { index, option ->
-            val isSelected = option == selected
+        // Exclusive "use default" choice (per-calendar only): its own group above
+        // the multi-select list, since inheriting is mutually exclusive with
+        // picking specific times.
+        if (allowInherit) {
             GroupedRow(
-                title = reminderOverrideLabel(option),
-                position = positionOf(index, rowCount),
-                selected = isSelected,
-                trailing = if (isSelected) {
+                title = stringResource(R.string.reminder_use_default),
+                position = Position.Alone,
+                selected = inherits,
+                trailing = if (inherits) {
                     { SelectedCheck() }
                 } else {
                     null
                 },
-                onClick = {
-                    onSelect(option)
-                    onDismiss()
-                },
+                onClick = { apply(CalendarReminderOverride.Inherit) },
+            )
+            Spacer(Modifier.height(24.dp))
+        }
+        val rowCount = rows.size + 1 // + the custom row
+        rows.forEachIndexed { index, minute ->
+            val checked = minute in selectedMinutes
+            GroupedRow(
+                title = reminderLeadTimeLabel(minute),
+                position = positionOf(index, rowCount),
+                selected = checked,
+                trailing = { Checkbox(checked = checked, onCheckedChange = { toggle(minute) }) },
+                onClick = { toggle(minute) },
             )
         }
         // When expanded, the Custom row connects downward into the editor card
         // so the two read as one grouped container (the per-calendar pattern).
         GroupedRow(
-            title = if (customSelected) {
-                stringResource(
-                    R.string.reminder_custom_with_value,
-                    reminderLeadTimeLabel(selectedMinutes!!),
-                )
-            } else {
-                stringResource(R.string.event_edit_reminder_custom)
-            },
-            position = if (customExpanded) Position.Top else positionOf(options.size, rowCount),
-            selected = customSelected,
-            trailing = if (customSelected) {
-                { SelectedCheck() }
-            } else {
-                null
-            },
+            title = stringResource(R.string.event_edit_reminder_custom),
+            position = if (customExpanded) Position.Top else positionOf(rows.size, rowCount),
             onClick = { customExpanded = !customExpanded },
         )
         AnimatedVisibility(
@@ -184,8 +213,9 @@ fun ReminderDefaultPicker(
                 unit = unit,
                 onUnitChange = { unit = it },
                 onConfirm = { minutes ->
-                    onSelect(CalendarReminderOverride.Minutes(minutes))
-                    onDismiss()
+                    emit(selectedMinutes + minutes)
+                    amountText = ""
+                    customExpanded = false
                 },
             )
         }
@@ -260,6 +290,17 @@ private fun CustomReminderEditor(
     }
 }
 
+/** A short explanatory paragraph shown under a picker's title, above the rows. */
+@Composable
+private fun PickerDescription(text: String) {
+    Text(
+        text = text,
+        style = MaterialTheme.typography.bodyMedium,
+        color = MaterialTheme.colorScheme.onSurfaceVariant,
+        modifier = Modifier.padding(horizontal = 16.dp, vertical = 8.dp),
+    )
+}
+
 @Composable
 private fun SelectedCheck() {
     Icon(
@@ -269,18 +310,146 @@ private fun SelectedCheck() {
     )
 }
 
+/**
+ * Agenda-range picker, full-screen. Two grouped lists — the calendar-aligned
+ * options (today / this week / this month) and the rolling windows (next 7 / 30
+ * days), with a "Custom" row that expands an inline day-count editor (1–365).
+ * Mirrors [ReminderDefaultPicker]'s custom-expand pattern.
+ */
 @Composable
-private fun reminderOverrideLabel(override: CalendarReminderOverride): String = when (override) {
-    CalendarReminderOverride.Inherit -> stringResource(R.string.reminder_use_default)
-    CalendarReminderOverride.None -> stringResource(R.string.reminder_none)
-    is CalendarReminderOverride.Minutes -> reminderLeadTimeLabel(override.minutes)
+fun AgendaRangePicker(
+    title: String,
+    description: String,
+    selected: AgendaRange,
+    onSelect: (AgendaRange) -> Unit,
+    onDismiss: () -> Unit,
+) {
+    val calendarAligned = listOf(AgendaRange.Day, AgendaRange.ThisWeek, AgendaRange.ThisMonth)
+    val rolling = listOf(AgendaRange.Week, AgendaRange.Month)
+    val rollingRowCount = rolling.size + 1 // + the custom row
+    val customSelected = selected is AgendaRange.Custom
+
+    var customExpanded by rememberSaveable { mutableStateOf(false) }
+    var amountText by rememberSaveable {
+        mutableStateOf((selected as? AgendaRange.Custom)?.days?.toString() ?: "")
+    }
+
+    val rangeRow: @Composable (AgendaRange, Position) -> Unit = { option, position ->
+        val isSelected = option == selected
+        GroupedRow(
+            title = agendaRangeLabel(option),
+            position = position,
+            selected = isSelected,
+            trailing = if (isSelected) {
+                { SelectedCheck() }
+            } else {
+                null
+            },
+            onClick = {
+                onSelect(option)
+                onDismiss()
+            },
+        )
+    }
+
+    FullScreenPicker(title = title, onDismiss = onDismiss) {
+        PickerDescription(description)
+
+        // Calendar-aligned windows.
+        calendarAligned.forEachIndexed { index, option ->
+            rangeRow(option, positionOf(index, calendarAligned.size))
+        }
+
+        Spacer(Modifier.height(12.dp))
+
+        // Rolling windows + custom.
+        rolling.forEachIndexed { index, option ->
+            rangeRow(option, positionOf(index, rollingRowCount))
+        }
+        GroupedRow(
+            title = if (customSelected) {
+                agendaRangeLabel(selected)
+            } else {
+                stringResource(R.string.agenda_range_custom)
+            },
+            position = if (customExpanded) Position.Top else positionOf(rolling.size, rollingRowCount),
+            selected = customSelected,
+            trailing = if (customSelected) {
+                { SelectedCheck() }
+            } else {
+                null
+            },
+            onClick = { customExpanded = !customExpanded },
+        )
+        AnimatedVisibility(
+            visible = customExpanded,
+            enter = calendarExpandEnter(),
+            exit = calendarCollapseExit(),
+        ) {
+            CustomDaysEditor(
+                amountText = amountText,
+                onAmountChange = { amountText = it },
+                onConfirm = { days ->
+                    onSelect(AgendaRange.Custom(days))
+                    onDismiss()
+                },
+            )
+        }
+    }
 }
 
-/** Seed the custom editor: the largest exact unit for [minutes] (null → empty). */
-private fun decomposeReminder(minutes: Int?): Pair<String, ReminderUnit> = when {
-    minutes == null -> "" to ReminderUnit.Minutes
-    minutes % 10_080 == 0 -> (minutes / 10_080).toString() to ReminderUnit.Weeks
-    minutes % 1_440 == 0 -> (minutes / 1_440).toString() to ReminderUnit.Days
-    minutes % 60 == 0 -> (minutes / 60).toString() to ReminderUnit.Hours
-    else -> minutes.toString() to ReminderUnit.Minutes
+/** The expanded "Custom" day-count editor: an amount field (1–365) and Set. */
+@Composable
+private fun CustomDaysEditor(
+    amountText: String,
+    onAmountChange: (String) -> Unit,
+    onConfirm: (Int) -> Unit,
+) {
+    val days = amountText.toIntOrNull()
+        ?.takeIf { it in AgendaRange.MIN_CUSTOM_DAYS..AgendaRange.MAX_CUSTOM_DAYS }
+    Surface(
+        color = MaterialTheme.colorScheme.surfaceContainerHigh,
+        shape = RoundedCornerShape(topStart = 6.dp, topEnd = 6.dp, bottomStart = 22.dp, bottomEnd = 22.dp),
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(horizontal = 16.dp),
+    ) {
+        Row(
+            modifier = Modifier.padding(16.dp),
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            DialogAmountField(
+                value = amountText,
+                onValueChange = onAmountChange,
+                placeholder = "30",
+            )
+            Spacer(Modifier.width(16.dp))
+            Text(
+                text = days?.let { pluralStringResource(R.plurals.agenda_range_days, it, it) }
+                    ?: stringResource(R.string.agenda_range_custom_hint),
+                style = MaterialTheme.typography.bodyLarge,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                modifier = Modifier.weight(1f),
+            )
+            Spacer(Modifier.width(16.dp))
+            FilledTonalButton(
+                onClick = { days?.let(onConfirm) },
+                enabled = days != null,
+            ) {
+                Text(stringResource(R.string.reminder_custom_set))
+            }
+        }
+    }
 }
+
+/** Human label for an [AgendaRange] (used by the picker rows and settings summary). */
+@Composable
+fun agendaRangeLabel(range: AgendaRange): String = when (range) {
+    AgendaRange.Day -> stringResource(R.string.agenda_range_day)
+    AgendaRange.ThisWeek -> stringResource(R.string.agenda_range_this_week)
+    AgendaRange.ThisMonth -> stringResource(R.string.agenda_range_this_month)
+    AgendaRange.Week -> stringResource(R.string.agenda_range_week)
+    AgendaRange.Month -> stringResource(R.string.agenda_range_month)
+    is AgendaRange.Custom -> pluralStringResource(R.plurals.agenda_range_days, range.days, range.days)
+}
+

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/TimeFormat.kt

@@ -0,0 +1,57 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.runtime.staticCompositionLocalOf
+import java.time.LocalTime
+import java.time.format.DateTimeFormatter
+import java.util.Locale
+
+/**
+ * The resolved clock convention for the whole UI: `true` = 24-hour ("14:00"),
+ * `false` = 12-hour ("2:00 PM"). Provided once at the app root from the
+ * `TimeFormatPref` preference resolved against the device's 24-hour system
+ * setting, so every time label reads it without per-screen plumbing. Defaults
+ * to 24-hour for previews and any composition that forgets to provide it.
+ */
+val LocalUse24HourFormat = staticCompositionLocalOf { true }
+
+private const val PATTERN_24 = "HH:mm"
+private const val PATTERN_12 = "h:mm a"
+private const val HOUR_PATTERN_12 = "h a"
+
+/** A time-of-day [DateTimeFormatter] for the resolved convention and [locale]. */
+fun timeOfDayFormatter(is24Hour: Boolean, locale: Locale): DateTimeFormatter =
+    DateTimeFormatter.ofPattern(if (is24Hour) PATTERN_24 else PATTERN_12, locale)
+
+/**
+ * Format a wall-clock time (hour 0..23, minute 0..59) honouring the resolved
+ * [is24Hour] convention and [locale]: 24h → "14:00", 12h → "2:00 PM". Pure, so
+ * it can be unit-tested and used off the main thread (widget, notifications).
+ */
+fun formatTimeOfDay(hour: Int, minute: Int, is24Hour: Boolean, locale: Locale): String =
+    LocalTime.of(hour.coerceIn(0, 23), minute.coerceIn(0, 59))
+        .format(timeOfDayFormatter(is24Hour, locale))
+
+/**
+ * Format minutes-from-midnight (0..1440) as a time label. The end-of-day value
+ * 1440 renders as "24:00" in 24h (its established reading) and as midnight
+ * ("12:00 AM") in 12h, which has no 24:00 equivalent.
+ */
+fun formatMinuteOfDay(minutes: Int, is24Hour: Boolean, locale: Locale): String = when {
+    minutes >= MINUTES_PER_DAY && is24Hour -> "24:00"
+    minutes >= MINUTES_PER_DAY -> formatTimeOfDay(0, 0, is24Hour = false, locale)
+    else -> formatTimeOfDay(minutes / 60, minutes % 60, is24Hour, locale)
+}
+
+/**
+ * The compact hour-only label for a timeline gutter: 24h → "13" (zero-padded,
+ * the prior look); 12h → "1 PM".
+ */
+fun formatHourLabel(hour: Int, is24Hour: Boolean, locale: Locale): String =
+    if (is24Hour) {
+        "%02d".format(hour)
+    } else {
+        LocalTime.of(hour.coerceIn(0, 23), 0)
+            .format(DateTimeFormatter.ofPattern(HOUR_PATTERN_12, locale))
+    }
+
+private const val MINUTES_PER_DAY = 1_440

app/src/main/java/de/jeanlucmakiola/calendula/ui/day/DayScreen.kt

@@ -80,7 +80,12 @@ import de.jeanlucmakiola.calendula.ui.common.rememberReduceMotion
 import de.jeanlucmakiola.calendula.ui.common.next
 import de.jeanlucmakiola.calendula.ui.common.pastelize
 import de.jeanlucmakiola.calendula.ui.common.rememberCalendarSlideSpec
-import de.jeanlucmakiola.calendula.ui.week.MINUTES_PER_DAY
+import de.jeanlucmakiola.calendula.ui.common.currentLocale
+import de.jeanlucmakiola.calendula.ui.common.LocalUse24HourFormat
+import de.jeanlucmakiola.calendula.ui.common.LocalShowHourLines
+import de.jeanlucmakiola.calendula.ui.common.formatHourLabel
+import de.jeanlucmakiola.calendula.ui.common.formatMinuteOfDay
+import de.jeanlucmakiola.calendula.ui.common.hourSeparatorLines
 import de.jeanlucmakiola.calendula.ui.week.TimedBlock
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
@@ -466,6 +471,8 @@ private fun Timeline(
 ) {
     val totalHeight = HOUR_HEIGHT * 24
     val dark = isSystemInDarkTheme()
+    val use24Hour = LocalUse24HourFormat.current
+    val locale = currentLocale()
 
     Box(modifier = Modifier.fillMaxSize()) {
         // Gutter and day column are two scroll viewports that SHARE one scroll
@@ -488,7 +495,7 @@ private fun Timeline(
                     ) {
                         if (h > 0) {
                             Text(
-                                text = "%02d".format(h),
+                                text = formatHourLabel(h, use24Hour, locale),
                                 style = MaterialTheme.typography.labelSmall,
                                 color = MaterialTheme.colorScheme.onSurfaceVariant,
                                 modifier = Modifier
@@ -534,6 +541,8 @@ private fun DayColumnCard(
     modifier: Modifier = Modifier,
 ) {
     val hourPx = with(LocalDensity.current) { HOUR_HEIGHT.toPx() }
+    val showHourLines = LocalShowHourLines.current
+    val hourLineColor = MaterialTheme.colorScheme.outlineVariant
     Card(
         // Plain rectangular column — the soft corners come from the outer
         // rounded scroll viewport, so inner rounding would look odd at the edges.
@@ -546,6 +555,9 @@ private fun DayColumnCard(
         BoxWithConstraints(
             modifier = Modifier
                 .fillMaxSize()
+                // Faint hour separators sit over the column background but under
+                // the event blocks (drawBehind paints before the children).
+                .hourSeparatorLines(showHourLines, hourPx, hourLineColor)
                 // Tap an empty slot to create an event there. Taps on event
                 // blocks are consumed by their own click handler first, so this
                 // only fires on the column background. Snaps to the tapped hour.
@@ -589,7 +601,10 @@ private fun EventBlock(
     modifier: Modifier = Modifier,
 ) {
     val title = block.event.title.ifBlank { stringResource(R.string.event_untitled) }
-    val timeLabel = "${minToHm(block.startMin)}–${minToHm(block.endMin)}"
+    val use24Hour = LocalUse24HourFormat.current
+    val locale = currentLocale()
+    val timeLabel = "${minToHm(block.startMin, use24Hour, locale)}–" +
+        minToHm(block.endMin, use24Hour, locale)
     val showTime = block.endMin - block.startMin >= 45
     Box(
         modifier = modifier
@@ -635,8 +650,8 @@ private fun DayLoading() {
     }
 }
 
-private fun minToHm(min: Int): String =
-    if (min >= MINUTES_PER_DAY) "24:00" else "%02d:%02d".format(min / 60, min % 60)
+private fun minToHm(min: Int, is24Hour: Boolean, locale: Locale): String =
+    formatMinuteOfDay(min, is24Hour, locale)
 
 private fun formatDayTitle(date: LocalDate): String {
     val locale = Locale.getDefault()

app/src/main/java/de/jeanlucmakiola/calendula/ui/detail/EventDetailScreen.kt

@@ -95,6 +95,8 @@ import de.jeanlucmakiola.calendula.ui.common.predictiveBack
 import de.jeanlucmakiola.calendula.ui.common.CalendarFailure
 import de.jeanlucmakiola.calendula.ui.common.OptionCard
 import de.jeanlucmakiola.calendula.ui.common.currentLocale
+import de.jeanlucmakiola.calendula.ui.common.LocalUse24HourFormat
+import de.jeanlucmakiola.calendula.ui.common.timeOfDayFormatter
 import de.jeanlucmakiola.calendula.ui.common.pastelize
 import de.jeanlucmakiola.calendula.ui.common.recurrenceText
 import de.jeanlucmakiola.calendula.ui.common.reminderLeadTimeLabel
@@ -781,7 +783,7 @@ private fun formatWhen(
     val zid = ZoneId.of(zone.id)
     val dateFull = DateTimeFormatter.ofLocalizedDate(FormatStyle.FULL).withLocale(locale)
     val dateMedium = DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM).withLocale(locale)
-    val timeShort = DateTimeFormatter.ofLocalizedTime(FormatStyle.SHORT).withLocale(locale)
+    val timeShort = timeOfDayFormatter(LocalUse24HourFormat.current, locale)
 
     val startLdt = instance.start.toJavaLocalDateTime(zid)
     val allDayLabel = stringResource(R.string.event_detail_all_day)

app/src/main/java/de/jeanlucmakiola/calendula/ui/edit/EventEditScreen.kt

@@ -43,7 +43,6 @@ import androidx.compose.material.icons.filled.EventAvailable
 import androidx.compose.material.icons.filled.Lock
 import androidx.compose.material.icons.filled.Notifications
 import androidx.compose.material.icons.filled.Palette
-import androidx.compose.material.icons.filled.People
 import androidx.compose.material.icons.filled.Person
 import androidx.compose.material.icons.filled.PersonAdd
 import androidx.compose.material.icons.filled.Place
@@ -82,6 +81,8 @@ import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.SolidColor
 import androidx.compose.ui.graphics.isSpecified
@@ -118,11 +119,13 @@ import de.jeanlucmakiola.calendula.domain.toRRule
 import de.jeanlucmakiola.calendula.ui.common.calendarCollapseExit
 import de.jeanlucmakiola.calendula.ui.common.calendarExpandEnter
 import de.jeanlucmakiola.calendula.ui.common.predictiveBack
-import de.jeanlucmakiola.calendula.ui.common.CALENDAR_COLOR_PALETTE
+import de.jeanlucmakiola.calendula.data.calendar.CalendarColorPalette
 import de.jeanlucmakiola.calendula.ui.common.CalendarDatePickerDialog
 import de.jeanlucmakiola.calendula.ui.common.ColorSwatchRow
 import de.jeanlucmakiola.calendula.ui.common.DialogAmountField
 import de.jeanlucmakiola.calendula.ui.common.DialogUnitDropdown
+import de.jeanlucmakiola.calendula.ui.common.eventFormFieldIcon
+import de.jeanlucmakiola.calendula.ui.common.eventFormFieldLabel
 import de.jeanlucmakiola.calendula.ui.common.MILLIS_PER_DAY
 import de.jeanlucmakiola.calendula.ui.common.InlineTextField
 import de.jeanlucmakiola.calendula.ui.common.OptionCard
@@ -132,6 +135,8 @@ import de.jeanlucmakiola.calendula.ui.common.REMINDER_PRESETS
 import de.jeanlucmakiola.calendula.ui.common.ReminderUnit
 import de.jeanlucmakiola.calendula.ui.common.TimePickerAlert
 import de.jeanlucmakiola.calendula.ui.common.currentLocale
+import de.jeanlucmakiola.calendula.ui.common.LocalUse24HourFormat
+import de.jeanlucmakiola.calendula.ui.common.timeOfDayFormatter
 import de.jeanlucmakiola.calendula.ui.common.reminderLeadTimeLabel
 import de.jeanlucmakiola.calendula.ui.common.reminderUnitLabel
 import de.jeanlucmakiola.calendula.ui.common.pastelize
@@ -430,6 +435,10 @@ private fun EventEditContent(
     val form = state.form
     val locale = currentLocale()
     val dark = isSystemInDarkTheme()
+    // The title, date and recurrence are managed by the special-dates sync, so
+    // they're locked here; everything else (reminders, location, notes) is the
+    // user's to edit.
+    val locked = state.isManaged
     var picker by remember { mutableStateOf<PickerTarget?>(null) }
     var showCalendarPicker by rememberSaveable { mutableStateOf(false) }
     var showReminderPicker by rememberSaveable { mutableStateOf(false) }
@@ -476,6 +485,17 @@ private fun EventEditContent(
         ?: MaterialTheme.colorScheme.primary
     val gap = 12.dp
 
+    // Issue #10: on a fresh create form (setting on, nothing typed yet) focus the
+    // title and raise the keyboard so the user can type straight away. Keyed on
+    // Unit so it runs once per open — not on every keystroke — and guarded so
+    // editing or an imported/prefilled form never grabs focus.
+    val titleFocusRequester = remember { FocusRequester() }
+    LaunchedEffect(Unit) {
+        if (state.autofocusTitle && !state.isEditing && form.title.isBlank()) {
+            runCatching { titleFocusRequester.requestFocus() }
+        }
+    }
+
     // Per-event colour applicability for the resolved calendar:
     //  - palette calendars (Google, …) and local calendars always support it;
     //  - synced calendars with no palette only when the user opted in, and even
@@ -503,6 +523,11 @@ private fun EventEditContent(
             placeholder = stringResource(R.string.event_edit_title_hint),
             textStyle = MaterialTheme.typography.headlineMedium
                 .copy(fontWeight = FontWeight.SemiBold),
+            enabled = !locked,
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(vertical = 4.dp)
+                .focusRequester(titleFocusRequester),
         )
         Spacer(Modifier.height(10.dp))
         Box(
@@ -511,6 +536,17 @@ private fun EventEditContent(
                 .height(3.dp)
                 .background(accent, RoundedCornerShape(2.dp)),
         )
+        if (locked) {
+            Spacer(Modifier.height(10.dp))
+            Text(
+                text = stringResource(
+                    R.string.event_edit_managed_hint,
+                    selectedCalendar?.displayName.orEmpty(),
+                ),
+                style = MaterialTheme.typography.bodySmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+            )
+        }
 
         Spacer(Modifier.height(20.dp))
 
@@ -529,7 +565,11 @@ private fun EventEditContent(
                         style = MaterialTheme.typography.titleMedium,
                         modifier = Modifier.weight(1f),
                     )
-                    Switch(checked = form.isAllDay, onCheckedChange = viewModel::setAllDay)
+                    Switch(
+                        checked = form.isAllDay,
+                        onCheckedChange = viewModel::setAllDay,
+                        enabled = !locked,
+                    )
                 }
             },
         ) {
@@ -541,6 +581,7 @@ private fun EventEditContent(
                 locale = locale,
                 onDateClick = { picker = PickerTarget.StartDate },
                 onTimeClick = { picker = PickerTarget.StartTime },
+                enabled = !locked,
             )
             ScheduleRow(
                 label = stringResource(R.string.event_edit_ends),
@@ -550,6 +591,7 @@ private fun EventEditContent(
                 onDateClick = { picker = PickerTarget.EndDate },
                 onTimeClick = { picker = PickerTarget.EndTime },
                 isError = EventFormProblem.EndBeforeStart in state.problems,
+                enabled = !locked,
             )
             if (EventFormProblem.EndBeforeStart in state.problems) {
                 Spacer(Modifier.height(2.dp))
@@ -680,7 +722,7 @@ private fun EventEditContent(
             EditCard(
                 icon = Icons.Default.Repeat,
                 iconContentDescription = null,
-                onClick = { showRecurrencePicker = true },
+                onClick = if (locked) null else ({ showRecurrencePicker = true }),
             ) {
                 Row(
                     verticalAlignment = Alignment.CenterVertically,
@@ -1017,9 +1059,9 @@ private fun FieldPickerDialog(
             Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
                 hiddenFields.forEach { field ->
                     OptionCard(
-                        label = stringResource(fieldLabel(field)),
+                        label = stringResource(eventFormFieldLabel(field)),
                         onClick = { onSelect(field) },
-                        icon = fieldIcon(field),
+                        icon = eventFormFieldIcon(field),
                     )
                 }
             }
@@ -1636,28 +1678,6 @@ private fun readContactAddress(context: Context, uri: Uri): String? =
     }
 
 
-private fun fieldLabel(field: EventFormField): Int = when (field) {
-    EventFormField.Location -> R.string.event_detail_location
-    EventFormField.Description -> R.string.event_detail_description
-    EventFormField.Reminders -> R.string.event_detail_reminders
-    EventFormField.Recurrence -> R.string.event_detail_recurrence
-    EventFormField.Availability -> R.string.event_edit_availability
-    EventFormField.Visibility -> R.string.event_edit_visibility
-    EventFormField.Color -> R.string.event_edit_color
-    EventFormField.Attendees -> R.string.event_edit_attendees
-}
-
-private fun fieldIcon(field: EventFormField): ImageVector = when (field) {
-    EventFormField.Location -> Icons.Default.Place
-    EventFormField.Description -> Icons.AutoMirrored.Filled.Notes
-    EventFormField.Reminders -> Icons.Default.Notifications
-    EventFormField.Recurrence -> Icons.Default.Repeat
-    EventFormField.Availability -> Icons.Default.EventAvailable
-    EventFormField.Visibility -> Icons.Default.Lock
-    EventFormField.Color -> Icons.Default.Palette
-    EventFormField.Attendees -> Icons.Default.People
-}
-
 /**
  * Visibility selector: one card per level, each with its own icon; the
  * current level is highlighted. Tap picks and closes.
@@ -1725,7 +1745,7 @@ private fun ColorPickerDialog(
                     )
                 } else {
                     ColorSwatchRow(
-                        colors = CALENDAR_COLOR_PALETTE,
+                        colors = CalendarColorPalette.all,
                         selected = selected,
                         onSelect = onPickRaw,
                         dark = dark,
@@ -1860,6 +1880,7 @@ private fun InlineField(
     textStyle: TextStyle = MaterialTheme.typography.titleMedium,
     singleLine: Boolean = true,
     minLines: Int = 1,
+    enabled: Boolean = true,
     keyboardType: KeyboardType = KeyboardType.Text,
     modifier: Modifier = Modifier
         .fillMaxWidth()
@@ -1873,6 +1894,7 @@ private fun InlineField(
         textStyle = textStyle,
         singleLine = singleLine,
         minLines = minLines,
+        enabled = enabled,
         keyboardType = keyboardType,
     )
 }
@@ -1887,19 +1909,22 @@ private fun ScheduleRow(
     onDateClick: () -> Unit,
     onTimeClick: () -> Unit,
     isError: Boolean = false,
+    enabled: Boolean = true,
 ) {
     val dateFormat = remember(locale) {
         DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM).withLocale(locale)
     }
-    val timeFormat = remember(locale) {
-        DateTimeFormatter.ofLocalizedTime(FormatStyle.SHORT).withLocale(locale)
+    val use24Hour = LocalUse24HourFormat.current
+    val timeFormat = remember(locale, use24Hour) {
+        timeOfDayFormatter(use24Hour, locale)
     }
     // Tappable values read as links (primary), like the location on the
-    // detail screen; errors flip them to the error colour.
-    val valueColor = if (isError) {
-        MaterialTheme.colorScheme.error
-    } else {
-        MaterialTheme.colorScheme.primary
+    // detail screen; errors flip them to the error colour; a locked (managed)
+    // row dims to a plain, non-tappable value.
+    val valueColor = when {
+        !enabled -> MaterialTheme.colorScheme.onSurfaceVariant
+        isError -> MaterialTheme.colorScheme.error
+        else -> MaterialTheme.colorScheme.primary
     }
     Row(
         verticalAlignment = Alignment.CenterVertically,
@@ -1916,7 +1941,7 @@ private fun ScheduleRow(
             style = MaterialTheme.typography.titleMedium,
             color = valueColor,
             modifier = Modifier
-                .clickable(onClick = onDateClick)
+                .clickable(enabled = enabled, onClick = onDateClick)
                 .padding(vertical = 8.dp, horizontal = 6.dp),
         )
         if (!isAllDay) {
@@ -1925,7 +1950,7 @@ private fun ScheduleRow(
                 style = MaterialTheme.typography.titleMedium,
                 color = valueColor,
                 modifier = Modifier
-                    .clickable(onClick = onTimeClick)
+                    .clickable(enabled = enabled, onClick = onTimeClick)
                     .padding(vertical = 8.dp, horizontal = 6.dp),
             )
         }

app/src/main/java/de/jeanlucmakiola/calendula/ui/edit/EventEditUiState.kt

@@ -29,6 +29,18 @@ data class EventEditUiState(
     val hiddenFields: List<EventFormField> = emptyList(),
     /** True while editing an existing event (the calendar is then fixed). */
     val isEditing: Boolean = false,
+    /**
+     * True when the event's calendar is a contact special-dates calendar the app
+     * manages. While editing such an event the title, date and recurrence are
+     * locked (sync overwrites them); reminders, location and notes stay editable.
+     */
+    val isManaged: Boolean = false,
+    /**
+     * Whether to focus the title and raise the keyboard when this is a fresh
+     * create form (issue #10). Mirrors the settings flag; the screen only acts
+     * on it for a new event with an empty title, never when editing/importing.
+     */
+    val autofocusTitle: Boolean = true,
     /**
      * True while an edit changed the recurrence rule — the save-scope dialog
      * then drops "only this event" (an exception row can't carry a rule).

app/src/main/java/de/jeanlucmakiola/calendula/ui/edit/EventEditViewModel.kt

@@ -108,10 +108,10 @@ class EventEditViewModel @Inject constructor(
     )
 
     private data class ReminderDefaults(
-        val timed: Int?,
-        val allDay: Int?,
-        val timedOverrides: Map<Long, Int?>,
-        val allDayOverrides: Map<Long, Int?>,
+        val timed: List<Int>,
+        val allDay: List<Int>,
+        val timedOverrides: Map<Long, List<Int>>,
+        val allDayOverrides: Map<Long, List<Int>>,
     )
 
     private data class ExternalInputs(
@@ -119,12 +119,21 @@ class EventEditViewModel @Inject constructor(
         val lastUsed: Long?,
         val defaultFields: Set<EventFormField>,
         val allowColorOnUnsupported: Boolean,
+        val autofocusTitle: Boolean,
     )
 
-    /** Writable calendars — the only valid event targets. */
-    private val writableCalendars: Flow<List<CalendarSource>> = repository.calendars()
-        .map { calendars -> calendars.filter { it.canModifyContents } }
-        .catch { emit(emptyList()) }
+    /**
+     * Writable calendars — the only valid event targets. Disabled calendars are
+     * excluded, so you can't create into a calendar you've removed from the app;
+     * a last-used preselect landing on a now-disabled calendar falls back to the
+     * first remaining writable one (handled by [resolvedCalendarId] and [state]).
+     */
+    private val writableCalendars: Flow<List<CalendarSource>> = combine(
+        repository.calendars(),
+        prefs.disabledCalendarIds,
+    ) { calendars, disabled ->
+        calendars.filter { it.canModifyContents && it.id !in disabled }
+    }.catch { emit(emptyList()) }
 
     /** The target calendar id, resolved exactly as the form shows it. */
     private val resolvedCalendarId: Flow<Long?> = combine(
@@ -152,10 +161,12 @@ class EventEditViewModel @Inject constructor(
             prefs.lastUsedCalendarId,
             settingsPrefs.defaultFormFields,
             settingsPrefs.allowColorOnUnsupportedCalendars,
+            settingsPrefs.autofocusEventTitle,
             ::ExternalInputs,
         ).flowOn(io),
         colorPalette,
-    ) { local, external, palette ->
+        settingsPrefs.managedCalendarIds,
+    ) { local, external, palette, managedIds ->
         val form = local.form ?: return@combine null
         val resolvedId = form.calendarId
             ?: external.lastUsed?.takeIf { id -> external.writable.any { it.id == id } }
@@ -170,6 +181,9 @@ class EventEditViewModel @Inject constructor(
             visibleFields = visibleFields,
             hiddenFields = (EventFormField.entries.toSet() - visibleFields).sorted(),
             isEditing = local.editTarget != null,
+            // Editing an event in a managed calendar locks its synced fields.
+            isManaged = local.editTarget != null && resolvedId != null && resolvedId in managedIds,
+            autofocusTitle = external.autofocusTitle,
             // A modified-occurrence exception can't carry its own rule, so
             // the scope dialog drops "only this event" after a rule change.
             recurrenceChanged = local.editTarget != null &&
@@ -249,7 +263,7 @@ class EventEditViewModel @Inject constructor(
             // Re-check after suspending: bail if the form closed or the user edited.
             val form = _form.value ?: return@launch
             if (_editTarget.value != null || _remindersTouched.value) return@launch
-            val default = resolveDefaultReminder(
+            val reminders = resolveDefaultReminder(
                 timedGlobal = defaults.timed,
                 allDayGlobal = defaults.allDay,
                 timedOverrides = defaults.timedOverrides,
@@ -257,7 +271,6 @@ class EventEditViewModel @Inject constructor(
                 calendarId = targetId,
                 isAllDay = form.isAllDay,
             )
-            val reminders = listOfNotNull(default)
             _form.value = form.copy(reminders = reminders)
             // Surface the section so an auto-applied default is visible and
             // removable, even when Reminders isn't a default-shown field.

app/src/main/java/de/jeanlucmakiola/calendula/ui/filter/FilterViewModel.kt

@@ -30,11 +30,16 @@ class FilterViewModel @Inject constructor(
         combine(
             repository.calendars(),
             prefs.hiddenCalendarIds,
-        ) { calendars, hidden ->
-            if (calendars.isEmpty()) {
+            prefs.disabledCalendarIds,
+        ) { calendars, hidden, disabled ->
+            // Disabled calendars are gone from the app entirely — they don't
+            // belong in the drawer's hide/show list (you can't hide what's
+            // already disabled). They live only in Settings → Calendars.
+            val enabled = calendars.filterNot { it.id in disabled }
+            if (enabled.isEmpty()) {
                 FilterUiState.Failure(FailureReason.NoCalendarsConfigured)
             } else {
-                FilterUiState.Success(groupByAccount(calendars, hidden))
+                FilterUiState.Success(groupByAccount(enabled, hidden))
             }
         }
             .catch { emit(FilterUiState.Failure(FailureReason.ProviderUnavailable)) }

app/src/main/java/de/jeanlucmakiola/calendula/ui/imports/ImportViewModel.kt

@@ -7,6 +7,7 @@ import dagger.hilt.android.lifecycle.HiltViewModel
 import de.jeanlucmakiola.calendula.data.calendar.CalendarRepository
 import de.jeanlucmakiola.calendula.data.di.IoDispatcher
 import de.jeanlucmakiola.calendula.data.ics.IcsImporter
+import de.jeanlucmakiola.calendula.data.prefs.CalendarPrefs
 import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.ics.IcsImportSummary
@@ -56,6 +57,7 @@ sealed interface ImportUiState {
 class ImportViewModel @Inject constructor(
     private val repository: CalendarRepository,
     private val importer: IcsImporter,
+    private val prefs: CalendarPrefs,
     @IoDispatcher private val io: CoroutineDispatcher,
 ) : ViewModel() {
 
@@ -79,11 +81,17 @@ class ImportViewModel @Inject constructor(
                     form = parsed.events.single().toEventForm(TimeZone.currentSystemDefault()),
                     warnings = parsed.warnings,
                 )
-                else -> ImportUiState.Many(
-                    events = parsed.events,
-                    warnings = parsed.warnings,
-                    calendars = repository.calendars().first().filter { it.canModifyContents },
-                )
+                else -> {
+                    // A disabled calendar is removed from the app, so it can't be
+                    // an import target — exclude it alongside the read-only ones.
+                    val disabled = prefs.disabledCalendarIds.first()
+                    ImportUiState.Many(
+                        events = parsed.events,
+                        warnings = parsed.warnings,
+                        calendars = repository.calendars().first()
+                            .filter { it.canModifyContents && it.id !in disabled },
+                    )
+                }
             }
         }
     }

app/src/main/java/de/jeanlucmakiola/calendula/ui/month/MonthScreen.kt

@@ -36,6 +36,8 @@ import androidx.compose.material3.TopAppBar
 import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.material3.rememberDrawerState
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalProvider
+import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableFloatStateOf
 import androidx.compose.runtime.mutableIntStateOf
@@ -44,6 +46,7 @@ import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.alpha
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.draw.clipToBounds
 import androidx.compose.ui.graphics.Color
@@ -60,10 +63,14 @@ import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import de.jeanlucmakiola.calendula.R
+import de.jeanlucmakiola.calendula.domain.hasEnded
 import de.jeanlucmakiola.calendula.ui.common.CalendarDrawer
 import de.jeanlucmakiola.calendula.ui.common.CalendarFabColumn
 import de.jeanlucmakiola.calendula.ui.common.CalendarFailure
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
+import de.jeanlucmakiola.calendula.ui.common.EventDimAlpha
+import de.jeanlucmakiola.calendula.ui.common.LocalDimCutoff
+import de.jeanlucmakiola.calendula.ui.common.rememberCurrentMinute
 import de.jeanlucmakiola.calendula.ui.common.ViewSwitcherPill
 import de.jeanlucmakiola.calendula.ui.common.calendarSlideTransition
 import de.jeanlucmakiola.calendula.ui.common.rememberCalendarFadeSpec
@@ -97,6 +104,14 @@ fun MonthScreen(
     val state by viewModel.state.collectAsStateWithLifecycle()
     val month by viewModel.month.collectAsStateWithLifecycle()
     val weekStart by viewModel.weekStart.collectAsStateWithLifecycle()
+    val dimCompleted by viewModel.dimCompletedEvents.collectAsStateWithLifecycle()
+    // The instant before which an event counts as completed, or null when dimming
+    // is off. derivedStateOf keeps the per-minute "now" from recomposing the
+    // screen while the setting is off (it stays null regardless of the tick).
+    val nowState = rememberCurrentMinute()
+    val dimCutoff by remember(dimCompleted) {
+        derivedStateOf { if (dimCompleted) nowState.value else null }
+    }
 
     val scrollBehavior = TopAppBarDefaults.pinnedScrollBehavior()
     val drawerState = rememberDrawerState(DrawerValue.Closed)
@@ -193,14 +208,16 @@ fun MonthScreen(
                     .fillMaxSize(),
             ) {
                 WeekdayHeader(weekStart = weekStart)
-                MonthContent(
-                    state = state,
-                    slideDir = slideDir,
-                    onSwipeNext = goNext,
-                    onSwipePrev = goPrev,
-                    onRetry = jumpToToday,
-                    onOpenDay = onOpenDay,
-                )
+                CompositionLocalProvider(LocalDimCutoff provides dimCutoff) {
+                    MonthContent(
+                        state = state,
+                        slideDir = slideDir,
+                        onSwipeNext = goNext,
+                        onSwipePrev = goPrev,
+                        onRetry = jumpToToday,
+                        onOpenDay = onOpenDay,
+                    )
+                }
             }
         }
     }
@@ -558,6 +575,8 @@ private fun MonthBar(
     modifier: Modifier = Modifier,
 ) {
     val title = event.title.ifBlank { stringResource(R.string.event_untitled) }
+    val dimCutoff = LocalDimCutoff.current
+    val dimmed = dimCutoff != null && event.hasEnded(dimCutoff)
     val shape = RoundedCornerShape(
         topStart = if (continuesLeft) 0.dp else 4.dp,
         bottomStart = if (continuesLeft) 0.dp else 4.dp,
@@ -565,7 +584,7 @@ private fun MonthBar(
         bottomEnd = if (continuesRight) 0.dp else 4.dp,
     )
     Box(
-        modifier = modifier
+        modifier = (if (dimmed) modifier.alpha(EventDimAlpha) else modifier)
             .background(pastelize(event.color, dark), shape)
             .padding(horizontal = 4.dp)
             .semantics { contentDescription = title },

app/src/main/java/de/jeanlucmakiola/calendula/ui/month/MonthViewModel.kt

@@ -59,6 +59,14 @@ class MonthViewModel @Inject constructor(
             initialValue = DayOfWeek.MONDAY,
         )
 
+    /** Whether to fade events that have already finished (display concern only). */
+    val dimCompletedEvents: StateFlow<Boolean> = settingsPrefs.dimCompletedEvents
+        .stateIn(
+            scope = viewModelScope,
+            started = SharingStarted.WhileSubscribed(5_000L),
+            initialValue = false,
+        )
+
     private val todayDate: LocalDate
         get() = Clock.System.now().toLocalDateTime(zone).date
 

app/src/main/java/de/jeanlucmakiola/calendula/ui/search/SearchScreen.kt

@@ -54,6 +54,8 @@ import de.jeanlucmakiola.calendula.ui.common.GroupedRow
 import de.jeanlucmakiola.calendula.ui.common.InlineTextField
 import de.jeanlucmakiola.calendula.ui.common.Position
 import de.jeanlucmakiola.calendula.ui.common.currentLocale
+import de.jeanlucmakiola.calendula.ui.common.LocalUse24HourFormat
+import de.jeanlucmakiola.calendula.ui.common.timeOfDayFormatter
 import de.jeanlucmakiola.calendula.ui.common.pastelize
 import de.jeanlucmakiola.calendula.ui.common.positionOf
 import java.time.Instant as JavaInstant
@@ -217,12 +219,11 @@ private fun searchSummary(event: EventInstance): String {
     val dateText = remember(locale) {
         DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM).withLocale(locale)
     }.format(start)
+    val use24Hour = LocalUse24HourFormat.current
     val timeText = if (event.isAllDay) {
         stringResource(R.string.event_detail_all_day)
     } else {
-        remember(locale) {
-            DateTimeFormatter.ofLocalizedTime(FormatStyle.SHORT).withLocale(locale)
-        }.format(start)
+        remember(locale, use24Hour) { timeOfDayFormatter(use24Hour, locale) }.format(start)
     }
     val base = "$dateText · $timeText"
     return event.location?.takeIf { it.isNotBlank() }?.let { "$base · $it" } ?: base

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/SettingsUiState.kt

@@ -1,10 +1,15 @@
 package de.jeanlucmakiola.calendula.ui.settings
 
+import de.jeanlucmakiola.calendula.data.prefs.CalendarReminderOverride
+import de.jeanlucmakiola.calendula.data.prefs.PastEventDisplay
 import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
 import de.jeanlucmakiola.calendula.data.prefs.ThemeMode
+import de.jeanlucmakiola.calendula.data.prefs.TimeFormatPref
 import de.jeanlucmakiola.calendula.data.prefs.WeekStartPref
 import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.EventFormField
+import de.jeanlucmakiola.calendula.domain.contacts.SpecialDateType
+import de.jeanlucmakiola.calendula.ui.agenda.AgendaRange
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
 
 /**
@@ -17,32 +22,48 @@ data class SettingsUiState(
     val themeMode: ThemeMode = ThemeMode.SYSTEM,
     val dynamicColor: Boolean = true,
     val dynamicColorAvailable: Boolean = true,
-    val weekStart: WeekStartPref = WeekStartPref.AUTO,
+    val weekStart: WeekStartPref = WeekStartPref.Auto,
+    /** Clock convention for time labels (v2.11). AUTO follows the system setting. */
+    val timeFormat: TimeFormatPref = TimeFormatPref.AUTO,
+    /** Whether the week/day timeline draws an hour separator line (v2.11). */
+    val showHourLines: Boolean = false,
+    /** How the Agenda screen treats events that already ended today. */
+    val pastEventDisplay: PastEventDisplay = PastEventDisplay.SHOW,
+    /** Whether the month/week grids fade events that have already finished. */
+    val dimCompletedEvents: Boolean = false,
+    /** How far ahead the in-app Agenda screen shows events (v2.11). */
+    val agendaScreenRange: AgendaRange = AgendaRange.Month,
+    /** How far ahead the agenda widget shows events (v2.11). */
+    val agendaWidgetRange: AgendaRange = AgendaRange.Month,
+    /** Whether the agenda shows its top range bar — header + switcher (v2.11). */
+    val agendaShowRangeBar: Boolean = true,
     /** The calendar view the app opens on, and the home of the view back stack (M1). */
     val defaultView: CalendarView = CalendarView.Week,
     /** Optional event-form fields shown by default (rest behind "more fields"). */
     val defaultFormFields: Set<EventFormField> = SettingsPrefs.DEFAULT_FORM_FIELDS,
+    /** Whether the new-event form auto-focuses the title and shows the keyboard (#10). */
+    val autofocusEventTitle: Boolean = true,
     /** Whether Calendula posts reminder notifications (v1.4). */
     val remindersEnabled: Boolean = true,
     /**
-     * The default reminder lead time (minutes) prefilled on new timed events;
-     * null = no default reminder. Per-calendar overrides take precedence.
+     * The default reminder lead times (minutes) prefilled on new timed events;
+     * empty = no default reminder. Per-calendar overrides take precedence.
      */
-    val defaultReminderMinutes: Int? = null,
-    /** The default reminder lead time prefilled on new all-day events; null = none. */
-    val defaultAllDayReminderMinutes: Int? = null,
+    val defaultReminderMinutes: List<Int> = emptyList(),
+    /** The default reminder lead times prefilled on new all-day events; empty = none. */
+    val defaultAllDayReminderMinutes: List<Int> = emptyList(),
     /** Wall-clock time (minutes from midnight) all-day reminders fire at; default 09:00. */
     val allDayReminderTimeMinutes: Int = SettingsPrefs.DEFAULT_ALLDAY_REMINDER_TIME,
     /** How long the notification "Snooze" action defers a reminder; default 10 min. */
     val snoozeMinutes: Int = SettingsPrefs.DEFAULT_SNOOZE_MINUTES,
     /**
      * Per-calendar overrides of [defaultReminderMinutes] for timed events: a
-     * calendar present in the map overrides the global default (null value = no
+     * calendar present in the map overrides the global default (empty value = no
      * reminder); absent = inherit the global default.
      */
-    val perCalendarReminderOverride: Map<Long, Int?> = emptyMap(),
+    val perCalendarReminderOverride: Map<Long, List<Int>> = emptyMap(),
     /** Per-calendar overrides of [defaultAllDayReminderMinutes] for all-day events. */
-    val perCalendarAllDayReminderOverride: Map<Long, Int?> = emptyMap(),
+    val perCalendarAllDayReminderOverride: Map<Long, List<Int>> = emptyMap(),
     /** Writable calendars, shown as per-calendar reminder-override rows. */
     val writableCalendars: List<CalendarSource> = emptyList(),
     /**
@@ -50,4 +71,30 @@ data class SettingsUiState(
      * colour palette (the colour may then not survive their next sync).
      */
     val allowColorOnUnsupportedCalendars: Boolean = false,
+    /**
+     * Ids of the contact special-dates calendars. Their reminders are owned by
+     * the Contact special dates section, so the per-calendar override list links
+     * out to it instead of offering an override here.
+     */
+    val managedCalendarIds: Set<Long> = emptySet(),
+)
+
+/**
+ * State for the contact special-dates sub-page (issue #15). Exposed as its own
+ * flow rather than folded into [SettingsUiState] (whose combine is already full).
+ * [titleTemplates] is always populated — a blank stored template resolves to the
+ * localized default so the editor never shows an empty field.
+ */
+data class SpecialDatesUiState(
+    val enabled: Boolean = false,
+    val types: Set<SpecialDateType> = SpecialDateType.entries.toSet(),
+    val titleTemplates: Map<SpecialDateType, String> = emptyMap(),
+    /** The reminder choice per type's managed calendar (applied to all its events). */
+    val reminderChoices: Map<SpecialDateType, CalendarReminderOverride> = emptyMap(),
+    /** Whether {year} resolves in titles (the source year is static and always correct). */
+    val showYear: Boolean = true,
+    /** True when READ_CONTACTS was revoked after enabling — the mirror is paused. */
+    val stalledPermission: Boolean = false,
+    /** Epoch millis of the last sync, or 0 if it has never run. */
+    val lastRun: Long = 0L,
 )

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/SettingsViewModel.kt

@@ -1,17 +1,40 @@
 package de.jeanlucmakiola.calendula.ui.settings
 
+import android.content.Context
 import android.os.Build
+import androidx.glance.appwidget.GlanceAppWidgetManager
+import androidx.glance.appwidget.state.updateAppWidgetState
+import androidx.glance.appwidget.updateAll
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import dagger.hilt.android.lifecycle.HiltViewModel
+import dagger.hilt.android.qualifiers.ApplicationContext
 import de.jeanlucmakiola.calendula.data.calendar.CalendarRepository
+import de.jeanlucmakiola.calendula.data.contacts.SpecialDatesCalendarSpec
+import de.jeanlucmakiola.calendula.data.contacts.SpecialDatesScheduler
+import de.jeanlucmakiola.calendula.data.contacts.SpecialDatesSyncEngine
+import de.jeanlucmakiola.calendula.data.contacts.resolveTitleTemplate
+import de.jeanlucmakiola.calendula.data.di.IoDispatcher
 import de.jeanlucmakiola.calendula.data.prefs.CalendarReminderOverride
+import de.jeanlucmakiola.calendula.data.prefs.choiceFor
+import de.jeanlucmakiola.calendula.data.prefs.PastEventDisplay
 import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
+import de.jeanlucmakiola.calendula.data.prefs.SpecialDatesStalledReason
 import de.jeanlucmakiola.calendula.data.prefs.ThemeMode
+import de.jeanlucmakiola.calendula.data.prefs.TimeFormatPref
 import de.jeanlucmakiola.calendula.data.prefs.WeekStartPref
 import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.EventFormField
+import de.jeanlucmakiola.calendula.domain.contacts.SpecialDateType
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.withContext
+import de.jeanlucmakiola.calendula.ui.agenda.AgendaRange
+import de.jeanlucmakiola.calendula.ui.agenda.storageValue
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
+import de.jeanlucmakiola.calendula.widget.agenda.AGENDA_PAST_DISPLAY_KEY
+import de.jeanlucmakiola.calendula.widget.agenda.AGENDA_RANGE_KEY
+import de.jeanlucmakiola.calendula.widget.agenda.AgendaWidget
+import de.jeanlucmakiola.calendula.widget.month.MonthWidget
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
@@ -20,12 +43,18 @@ import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
 import javax.inject.Inject
 
 @HiltViewModel
 class SettingsViewModel @Inject constructor(
     private val prefs: SettingsPrefs,
     repository: CalendarRepository,
+    private val specialDatesEngine: SpecialDatesSyncEngine,
+    specialDatesSpec: SpecialDatesCalendarSpec,
+    @IoDispatcher private val io: CoroutineDispatcher,
+    @ApplicationContext private val appContext: Context,
 ) : ViewModel() {
 
     private val dynamicColorAvailable = Build.VERSION.SDK_INT >= Build.VERSION_CODES.S
@@ -70,13 +99,37 @@ class SettingsViewModel @Inject constructor(
                 prefs.perCalendarReminderOverride,
                 prefs.perCalendarAllDayReminderOverride,
                 writableCalendars,
-            ) { overrides, allDayOverrides, calendars ->
-                ReminderOverrides(overrides, allDayOverrides, calendars)
+                prefs.managedCalendarIds,
+            ) { overrides, allDayOverrides, calendars, managedIds ->
+                ReminderOverrides(overrides, allDayOverrides, calendars, managedIds)
             },
-            prefs.defaultView,
-        ) { base, defaults, overrides, defaultView ->
+            combine(
+                prefs.defaultView,
+                prefs.agendaScreenRange,
+                prefs.agendaWidgetRange,
+                prefs.timeFormat,
+                prefs.showHourLines,
+            ) { view, screenRange, widgetRange, timeFormat, showHourLines ->
+                ViewSettings(view, screenRange, widgetRange, timeFormat, showHourLines)
+            },
+            combine(
+                prefs.agendaShowRangeBar,
+                prefs.autofocusEventTitle,
+                prefs.pastEventDisplay,
+                prefs.dimCompletedEvents,
+                ::MiscSettings,
+            ),
+        ) { base, defaults, overrides, views, misc ->
             base.copy(
-                defaultView = defaultView,
+                defaultView = views.defaultView,
+                agendaScreenRange = views.agendaScreenRange,
+                agendaWidgetRange = views.agendaWidgetRange,
+                timeFormat = views.timeFormat,
+                showHourLines = views.showHourLines,
+                agendaShowRangeBar = misc.showRangeBar,
+                autofocusEventTitle = misc.autofocusEventTitle,
+                pastEventDisplay = misc.pastEventDisplay,
+                dimCompletedEvents = misc.dimCompletedEvents,
                 allowColorOnUnsupportedCalendars = defaults.allowColor,
                 defaultReminderMinutes = defaults.defaultReminder,
                 defaultAllDayReminderMinutes = defaults.allDayReminder,
@@ -85,6 +138,7 @@ class SettingsViewModel @Inject constructor(
                 perCalendarReminderOverride = overrides.timed,
                 perCalendarAllDayReminderOverride = overrides.allDay,
                 writableCalendars = overrides.calendars,
+                managedCalendarIds = overrides.managedIds,
             )
         }.stateIn(
             scope = viewModelScope,
@@ -92,20 +146,131 @@ class SettingsViewModel @Inject constructor(
             initialValue = SettingsUiState(dynamicColorAvailable = dynamicColorAvailable),
         )
 
+    // Serialises widget redraws so a rapid flip-and-flip-back can't run two
+    // updateAll calls at once — concurrent calls coalesce around a stale read
+    // and can leave the widget on the intermediate value. Held sequentially,
+    // the last call reads the final committed pref and renders it.
+    private val widgetRefreshMutex = Mutex()
+
     private data class ReminderDefaults(
         val allowColor: Boolean,
-        val defaultReminder: Int?,
-        val allDayReminder: Int?,
+        val defaultReminder: List<Int>,
+        val allDayReminder: List<Int>,
         val allDayReminderTime: Int,
         val snoozeMinutes: Int,
     )
 
     private data class ReminderOverrides(
-        val timed: Map<Long, Int?>,
-        val allDay: Map<Long, Int?>,
+        val timed: Map<Long, List<Int>>,
+        val allDay: Map<Long, List<Int>>,
         val calendars: List<CalendarSource>,
+        val managedIds: Set<Long>,
     )
 
+    private data class ViewSettings(
+        val defaultView: CalendarView,
+        val agendaScreenRange: AgendaRange,
+        val agendaWidgetRange: AgendaRange,
+        val timeFormat: TimeFormatPref,
+        val showHourLines: Boolean,
+    )
+
+    private data class MiscSettings(
+        val showRangeBar: Boolean,
+        val autofocusEventTitle: Boolean,
+        val pastEventDisplay: PastEventDisplay,
+        val dimCompletedEvents: Boolean,
+    )
+
+    /** Contact special-dates sub-page (issue #15); its own flow — the main state is full. */
+    val specialDatesState: StateFlow<SpecialDatesUiState> = combine(
+        combine(
+            prefs.specialDatesEnabled,
+            prefs.specialDatesTypes,
+            prefs.specialDatesTitleTemplates,
+            prefs.specialDatesShowYear,
+            prefs.specialDatesStatus,
+        ) { enabled, types, templates, showYear, status ->
+            SpecialDatesUiState(
+                enabled = enabled,
+                types = types,
+                // A blank stored template resolves to the localized default so the
+                // editor always shows something sensible.
+                titleTemplates = SpecialDateType.entries.associateWith { type ->
+                    specialDatesSpec.resolveTitleTemplate(type, templates)
+                },
+                showYear = showYear,
+                stalledPermission = status.stalled == SpecialDatesStalledReason.PermissionRevoked,
+                lastRun = status.lastRun,
+            )
+        },
+        prefs.specialDatesCalendars,
+        prefs.perCalendarAllDayReminderOverride,
+    ) { base, calendars, allDayOverrides ->
+        base.copy(
+            // An override is always seeded on creation; present-empty = None.
+            reminderChoices = calendars.mapValues { (_, calendarId) ->
+                allDayOverrides.choiceFor(calendarId)
+            },
+        )
+    }.stateIn(
+        scope = viewModelScope,
+        started = SharingStarted.WhileSubscribed(5_000L),
+        initialValue = SpecialDatesUiState(),
+    )
+
+    /**
+     * Turn the mirror on or off. Enabling schedules the daily job and runs an
+     * immediate sync (which creates the calendars); disabling cancels the job and
+     * tears the managed calendars down. The caller must have READ_CONTACTS granted
+     * before enabling.
+     */
+    fun setSpecialDatesEnabled(enabled: Boolean) {
+        viewModelScope.launch {
+            prefs.setSpecialDatesEnabled(enabled)
+            if (enabled) {
+                SpecialDatesScheduler.apply(appContext, enabled = true)
+                SpecialDatesScheduler.runNow(appContext)
+            } else {
+                SpecialDatesScheduler.apply(appContext, enabled = false)
+                withContext(io) { specialDatesEngine.teardown() }
+            }
+        }
+    }
+
+    fun setSpecialDateTypeEnabled(type: SpecialDateType, enabled: Boolean) {
+        viewModelScope.launch {
+            prefs.setSpecialDateTypeEnabled(type, enabled)
+            // Reconcile now: create the new type's calendar, or delete a disabled one.
+            SpecialDatesScheduler.runNow(appContext)
+        }
+    }
+
+    fun setSpecialDatesTitleTemplate(type: SpecialDateType, template: String) {
+        viewModelScope.launch {
+            prefs.setSpecialDatesTitleTemplate(type, template.trim())
+            SpecialDatesScheduler.runNow(appContext)
+        }
+    }
+
+    fun setSpecialDatesShowYear(enabled: Boolean) {
+        viewModelScope.launch {
+            prefs.setSpecialDatesShowYear(enabled)
+            SpecialDatesScheduler.runNow(appContext)
+        }
+    }
+
+    /**
+     * Set a type's managed-calendar reminder default and apply it to all its
+     * existing events (managed calendars own their reminders calendar-wide).
+     */
+    fun setSpecialDatesReminders(type: SpecialDateType, override: CalendarReminderOverride) {
+        viewModelScope.launch { withContext(io) { specialDatesEngine.applyReminders(type, override) } }
+    }
+
+    /** Kick off an immediate reconcile (the "Sync now" action). */
+    fun syncSpecialDatesNow() = SpecialDatesScheduler.runNow(appContext)
+
     fun setThemeMode(mode: ThemeMode) {
         viewModelScope.launch { prefs.setThemeMode(mode) }
     }
@@ -115,7 +280,68 @@ class SettingsViewModel @Inject constructor(
     }
 
     fun setWeekStart(pref: WeekStartPref) {
-        viewModelScope.launch { prefs.setWeekStart(pref) }
+        viewModelScope.launch {
+            prefs.setWeekStart(pref)
+            // Both widgets depend on the week start (month weekday header; the
+            // agenda widget's "this week" range).
+            widgetRefreshMutex.withLock {
+                AgendaWidget().updateAll(appContext)
+                MonthWidget().updateAll(appContext)
+            }
+        }
+    }
+
+    fun setAgendaScreenRange(range: AgendaRange) {
+        viewModelScope.launch { prefs.setAgendaScreenRange(range) }
+    }
+
+    fun setAgendaWidgetRange(range: AgendaRange) {
+        viewModelScope.launch {
+            prefs.setAgendaWidgetRange(range)
+            widgetRefreshMutex.withLock {
+                // Push the range into each instance's Glance state and recompose.
+                // The widget reads it via currentState, so this reflects reliably
+                // even when updateAll only recomposes a live session (it does not
+                // re-run provideGlance's data preamble).
+                val manager = GlanceAppWidgetManager(appContext)
+                manager.getGlanceIds(AgendaWidget::class.java).forEach { id ->
+                    updateAppWidgetState(appContext, id) { it[AGENDA_RANGE_KEY] = range.storageValue() }
+                }
+                AgendaWidget().updateAll(appContext)
+            }
+        }
+    }
+
+    fun setAgendaShowRangeBar(enabled: Boolean) {
+        viewModelScope.launch { prefs.setAgendaShowRangeBar(enabled) }
+    }
+
+    fun setTimeFormat(pref: TimeFormatPref) {
+        viewModelScope.launch { prefs.setTimeFormat(pref) }
+    }
+
+    fun setShowHourLines(enabled: Boolean) {
+        viewModelScope.launch { prefs.setShowHourLines(enabled) }
+    }
+
+    fun setPastEventDisplay(mode: PastEventDisplay) {
+        viewModelScope.launch {
+            prefs.setPastEventDisplay(mode)
+            // The agenda widget honours this setting too, so push it into each
+            // instance's Glance state and recompose — same reliable-update path as
+            // setAgendaWidgetRange (updateAll alone won't re-run the data preamble).
+            widgetRefreshMutex.withLock {
+                val manager = GlanceAppWidgetManager(appContext)
+                manager.getGlanceIds(AgendaWidget::class.java).forEach { id ->
+                    updateAppWidgetState(appContext, id) { it[AGENDA_PAST_DISPLAY_KEY] = mode.name }
+                }
+                AgendaWidget().updateAll(appContext)
+            }
+        }
+    }
+
+    fun setDimCompletedEvents(enabled: Boolean) {
+        viewModelScope.launch { prefs.setDimCompletedEvents(enabled) }
     }
 
     fun setDefaultView(view: CalendarView) {
@@ -130,11 +356,15 @@ class SettingsViewModel @Inject constructor(
         viewModelScope.launch { prefs.setRemindersEnabled(enabled) }
     }
 
-    fun setDefaultReminderMinutes(minutes: Int?) {
+    fun setAutofocusEventTitle(enabled: Boolean) {
+        viewModelScope.launch { prefs.setAutofocusEventTitle(enabled) }
+    }
+
+    fun setDefaultReminderMinutes(minutes: List<Int>) {
         viewModelScope.launch { prefs.setDefaultReminderMinutes(minutes) }
     }
 
-    fun setDefaultAllDayReminderMinutes(minutes: Int?) {
+    fun setDefaultAllDayReminderMinutes(minutes: List<Int>) {
         viewModelScope.launch { prefs.setDefaultAllDayReminderMinutes(minutes) }
     }
 

app/src/main/java/de/jeanlucmakiola/calendula/ui/week/WeekScreen.kt

@@ -45,7 +45,9 @@ import androidx.compose.material3.TopAppBar
 import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.material3.rememberDrawerState
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableFloatStateOf
 import androidx.compose.runtime.mutableIntStateOf
@@ -55,6 +57,7 @@ import androidx.compose.runtime.snapshotFlow
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.alpha
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.draw.clipToBounds
 import androidx.compose.ui.graphics.Color
@@ -73,16 +76,25 @@ import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import de.jeanlucmakiola.calendula.R
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.hasEnded
 import de.jeanlucmakiola.calendula.ui.common.CalendarDrawer
 import de.jeanlucmakiola.calendula.ui.common.CalendarFabColumn
 import de.jeanlucmakiola.calendula.ui.common.CalendarFailure
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
+import de.jeanlucmakiola.calendula.ui.common.EventDimAlpha
+import de.jeanlucmakiola.calendula.ui.common.LocalDimCutoff
 import de.jeanlucmakiola.calendula.ui.common.NowLine
+import de.jeanlucmakiola.calendula.ui.common.rememberCurrentMinute
 import de.jeanlucmakiola.calendula.ui.common.ViewSwitcherPill
 import de.jeanlucmakiola.calendula.ui.common.calendarSlideTransition
 import de.jeanlucmakiola.calendula.ui.common.rememberCalendarFadeSpec
 import de.jeanlucmakiola.calendula.ui.common.rememberReduceMotion
 import de.jeanlucmakiola.calendula.ui.common.currentLocale
+import de.jeanlucmakiola.calendula.ui.common.LocalUse24HourFormat
+import de.jeanlucmakiola.calendula.ui.common.LocalShowHourLines
+import de.jeanlucmakiola.calendula.ui.common.formatHourLabel
+import de.jeanlucmakiola.calendula.ui.common.formatMinuteOfDay
+import de.jeanlucmakiola.calendula.ui.common.hourSeparatorLines
 import de.jeanlucmakiola.calendula.ui.common.rememberCalendarSlideSpec
 import de.jeanlucmakiola.calendula.ui.common.next
 import de.jeanlucmakiola.calendula.ui.common.pastelize
@@ -124,6 +136,14 @@ fun WeekScreen(
 ) {
     val state by viewModel.state.collectAsStateWithLifecycle()
     val weekStart by viewModel.weekStartDate.collectAsStateWithLifecycle()
+    val dimCompleted by viewModel.dimCompletedEvents.collectAsStateWithLifecycle()
+    // The instant before which an event counts as completed, or null when dimming
+    // is off. derivedStateOf keeps the per-minute "now" from recomposing the
+    // screen while the setting is off (it stays null regardless of the tick).
+    val nowState = rememberCurrentMinute()
+    val dimCutoff by remember(dimCompleted) {
+        derivedStateOf { if (dimCompleted) nowState.value else null }
+    }
 
     val scrollBehavior = TopAppBarDefaults.pinnedScrollBehavior()
     val drawerState = rememberDrawerState(DrawerValue.Closed)
@@ -216,19 +236,21 @@ fun WeekScreen(
                 )
             },
         ) { innerPadding ->
-            WeekContent(
-                state = state,
-                slideDir = slideDir,
-                topSectionColor = topSectionColor,
-                onSwipeNext = goNext,
-                onSwipePrev = goPrev,
-                onRetry = jumpToToday,
-                onEventClick = onEventClick,
-                onCreateAt = { d, minutes -> onCreateEvent(d, minutes) },
-                modifier = Modifier
-                    .padding(innerPadding)
-                    .fillMaxSize(),
-            )
+            CompositionLocalProvider(LocalDimCutoff provides dimCutoff) {
+                WeekContent(
+                    state = state,
+                    slideDir = slideDir,
+                    topSectionColor = topSectionColor,
+                    onSwipeNext = goNext,
+                    onSwipePrev = goPrev,
+                    onRetry = jumpToToday,
+                    onEventClick = onEventClick,
+                    onCreateAt = { d, minutes -> onCreateEvent(d, minutes) },
+                    modifier = Modifier
+                        .padding(innerPadding)
+                        .fillMaxSize(),
+                )
+            }
         }
     }
 }
@@ -545,8 +567,10 @@ private fun AllDayBar(
     modifier: Modifier = Modifier,
 ) {
     val title = event.title.ifBlank { stringResource(R.string.event_untitled) }
+    val dimCutoff = LocalDimCutoff.current
+    val dimmed = dimCutoff != null && event.hasEnded(dimCutoff)
     Box(
-        modifier = modifier
+        modifier = (if (dimmed) modifier.alpha(EventDimAlpha) else modifier)
             .background(pastelize(event.color, dark), RoundedCornerShape(4.dp))
             .clickable(onClick = onClick)
             .padding(horizontal = 6.dp, vertical = 2.dp)
@@ -572,6 +596,8 @@ private fun Timeline(
 ) {
     val totalHeight = HOUR_HEIGHT * 24
     val dark = isSystemInDarkTheme()
+    val use24Hour = LocalUse24HourFormat.current
+    val locale = currentLocale()
 
     Box(modifier = Modifier.fillMaxSize()) {
         // Gutter and day columns are two scroll viewports that SHARE one scroll
@@ -595,7 +621,7 @@ private fun Timeline(
                     ) {
                         if (h > 0) {
                             Text(
-                                text = "%02d".format(h),
+                                text = formatHourLabel(h, use24Hour, locale),
                                 style = MaterialTheme.typography.labelSmall,
                                 color = MaterialTheme.colorScheme.onSurfaceVariant,
                                 modifier = Modifier
@@ -650,6 +676,8 @@ private fun DayColumnCard(
     modifier: Modifier = Modifier,
 ) {
     val hourPx = with(LocalDensity.current) { HOUR_HEIGHT.toPx() }
+    val showHourLines = LocalShowHourLines.current
+    val hourLineColor = MaterialTheme.colorScheme.outlineVariant
     Card(
         // Plain rectangular columns — the soft corners come from the outer
         // rounded scroll viewport, so inner rounding would look odd at the edges.
@@ -662,6 +690,9 @@ private fun DayColumnCard(
         BoxWithConstraints(
             modifier = Modifier
                 .fillMaxSize()
+                // Faint hour separators sit over the column background but under
+                // the event blocks (drawBehind paints before the children).
+                .hourSeparatorLines(showHourLines, hourPx, hourLineColor)
                 // Tap an empty slot to create an event there; taps on event
                 // blocks are consumed by their own handler first. Snaps to hour.
                 .pointerInput(date) {
@@ -680,6 +711,7 @@ private fun DayColumnCard(
                 EventBlock(
                     block = block,
                     dark = dark,
+                    height = height,
                     onClick = { onEventClick(block.event) },
                     modifier = Modifier
                         .offset(x = laneWidth * block.lane, y = top)
@@ -700,14 +732,35 @@ private fun DayColumnCard(
 private fun EventBlock(
     block: TimedBlock,
     dark: Boolean,
+    height: Dp,
     onClick: () -> Unit,
     modifier: Modifier = Modifier,
 ) {
     val title = block.event.title.ifBlank { stringResource(R.string.event_untitled) }
-    val timeLabel = "${minToHm(block.startMin)}–${minToHm(block.endMin)}"
-    val showTime = block.endMin - block.startMin >= 45
+    val use24Hour = LocalUse24HourFormat.current
+    val locale = currentLocale()
+    val timeLabel = "${minToHm(block.startMin, use24Hour, locale)}–" +
+        minToHm(block.endMin, use24Hour, locale)
+    // Only full-width (non-overlapping) blocks that are tall enough show the time.
+    // On narrow overlapping columns we drop it so the title can wrap to fill the
+    // whole block, mirroring Google Calendar.
+    val showTime = block.endMin - block.startMin >= 45 && block.laneCount == 1
+    val density = LocalDensity.current
+    val titleLineHeight = with(density) {
+        MaterialTheme.typography.labelMedium.lineHeight.toDp()
+    }
+    val timeLineHeight = with(density) {
+        MaterialTheme.typography.labelSmall.lineHeight.toDp()
+    }
+    // Wrap the title across as many lines as the block can fit (minus the 2.dp
+    // top/bottom padding and the reserved time line) instead of clipping it to a
+    // single character on slim, overlapping blocks.
+    val contentHeight = height - 4.dp - if (showTime) timeLineHeight else 0.dp
+    val titleMaxLines = (contentHeight / titleLineHeight).toInt().coerceAtLeast(1)
+    val dimCutoff = LocalDimCutoff.current
+    val dimmed = dimCutoff != null && block.event.hasEnded(dimCutoff)
     Box(
-        modifier = modifier
+        modifier = (if (dimmed) modifier.alpha(EventDimAlpha) else modifier)
             .background(pastelize(block.event.color, dark), RoundedCornerShape(4.dp))
             .clickable(onClick = onClick)
             .padding(horizontal = 4.dp, vertical = 2.dp)
@@ -717,18 +770,15 @@ private fun EventBlock(
             Text(
                 text = title,
                 style = MaterialTheme.typography.labelMedium,
-                maxLines = if (showTime) 1 else 2,
+                maxLines = titleMaxLines,
                 overflow = TextOverflow.Ellipsis,
                 color = Color.Black.copy(alpha = 0.85f),
             )
             if (showTime) {
-                // Narrow columns can't fit "13:00–14:00" on one line, so let it
-                // wrap to a second line (after the dash) instead of clipping the
-                // end time.
                 Text(
                     text = timeLabel,
                     style = MaterialTheme.typography.labelSmall,
-                    maxLines = 2,
+                    maxLines = 1,
                     overflow = TextOverflow.Ellipsis,
                     color = Color.Black.copy(alpha = 0.6f),
                 )
@@ -773,8 +823,8 @@ private fun WeekLoading() {
     }
 }
 
-private fun minToHm(min: Int): String =
-    if (min >= MINUTES_PER_DAY) "24:00" else "%02d:%02d".format(min / 60, min % 60)
+private fun minToHm(min: Int, is24Hour: Boolean, locale: java.util.Locale): String =
+    formatMinuteOfDay(min, is24Hour, locale)
 
 private fun formatWeekRange(weekStart: LocalDate): String {
     val locale = Locale.getDefault()

app/src/main/java/de/jeanlucmakiola/calendula/ui/week/WeekViewModel.kt

@@ -50,6 +50,14 @@ class WeekViewModel @Inject constructor(
     private val zone = TimeZone.currentSystemDefault()
     private val locale: Locale = Locale.getDefault()
 
+    /** Whether to fade events that have already finished (display concern only). */
+    val dimCompletedEvents: StateFlow<Boolean> = settingsPrefs.dimCompletedEvents
+        .stateIn(
+            scope = viewModelScope,
+            started = SharingStarted.WhileSubscribed(5_000L),
+            initialValue = false,
+        )
+
     private val todayDate: LocalDate
         get() = Clock.System.now().toLocalDateTime(zone).date
 

app/src/main/java/de/jeanlucmakiola/calendula/widget/WidgetData.kt

@@ -4,9 +4,12 @@ import android.Manifest
 import android.content.Context
 import android.content.pm.PackageManager
 import androidx.core.content.ContextCompat
+import de.jeanlucmakiola.calendula.data.prefs.PastEventDisplay
+import de.jeanlucmakiola.calendula.data.prefs.is24Hour
 import de.jeanlucmakiola.calendula.data.prefs.resolveFirstDay
 import de.jeanlucmakiola.calendula.domain.EventInstance
 import de.jeanlucmakiola.calendula.ui.agenda.AgendaDay
+import de.jeanlucmakiola.calendula.ui.agenda.AgendaRange
 import de.jeanlucmakiola.calendula.ui.agenda.agendaRange
 import de.jeanlucmakiola.calendula.ui.agenda.groupAgendaDays
 import kotlinx.coroutines.flow.first
@@ -22,9 +25,7 @@ import kotlinx.datetime.toInstant
 import kotlinx.datetime.toLocalDateTime
 import java.util.Locale
 import kotlin.time.Clock
-
-/** How far ahead the agenda widget loads (a month of upcoming events). */
-private const val AGENDA_WIDGET_DAYS = 30
+import kotlin.time.Instant
 
 /**
  * How far either side of today the month widget pre-loads. The displayed month
@@ -46,7 +47,28 @@ internal fun Context.hasCalendarPermission(): Boolean =
 sealed interface AgendaWidgetData {
     /** Calendar permission not granted — the widget can't read events. */
     data object NeedsPermission : AgendaWidgetData
-    data class Ready(val today: LocalDate, val days: List<AgendaDay>) : AgendaWidgetData
+    data class Ready(
+        val today: LocalDate,
+        /**
+         * Days with events across the **widest** selectable window. The displayed
+         * range is sliced from this in the composition (read reactively from
+         * Glance state), so a range change is pure recomposition rather than a
+         * flaky widget session restart — the same approach the month widget uses.
+         * Kept unfiltered: hiding/dimming finished events also happens reactively
+         * in the composition, against [now], for the same reliable-update reason.
+         */
+        val days: List<AgendaDay>,
+        /** Resolved clock convention for event time labels (the time-format pref). */
+        val is24Hour: Boolean,
+        /** First day of the week, for the calendar-aligned "this week" range. */
+        val weekStart: DayOfWeek,
+        /** Saved range pref — the fallback when an instance has no Glance state yet. */
+        val savedRange: AgendaRange,
+        /** Saved past-event display pref — the fallback before Glance state is set. */
+        val savedPastDisplay: PastEventDisplay,
+        /** Snapshot instant the data was read at, for "has this event ended?" tests. */
+        val now: Instant,
+    ) : AgendaWidgetData
 }
 
 /**
@@ -91,9 +113,27 @@ internal suspend fun Context.loadAgendaWidgetData(): AgendaWidgetData {
     if (!hasCalendarPermission()) return AgendaWidgetData.NeedsPermission
     val zone = systemZone()
     val anchor = today(zone)
-    val repo = widgetEntryPoint().calendarRepository()
-    val instances = repo.instances(agendaRange(anchor, AGENDA_WIDGET_DAYS, zone)).first()
-    return AgendaWidgetData.Ready(today = anchor, days = groupAgendaDays(anchor, instances, zone))
+    val ep = widgetEntryPoint()
+    val prefs = ep.settingsPrefs()
+    val savedRange = prefs.agendaWidgetRange.first()
+    val savedPastDisplay = prefs.pastEventDisplay.first()
+    val weekStart = prefs.weekStart.first().resolveFirstDay(Locale.getDefault())
+    // Load the widest selectable window once; the displayed range is sliced in
+    // the composition from Glance state, so changing the range is a plain
+    // recomposition and never depends on the widget session restarting.
+    val window = agendaRange(anchor, AgendaRange.MAX_CUSTOM_DAYS - 1, zone)
+    val instances = ep.calendarRepository().instances(window).first()
+    val is24Hour = prefs.timeFormat.first()
+        .is24Hour(android.text.format.DateFormat.is24HourFormat(this))
+    return AgendaWidgetData.Ready(
+        today = anchor,
+        days = groupAgendaDays(anchor, instances, zone),
+        is24Hour = is24Hour,
+        weekStart = weekStart,
+        savedRange = savedRange,
+        savedPastDisplay = savedPastDisplay,
+        now = Clock.System.now(),
+    )
 }
 
 /** One-shot wide read backing the month widget's grid for any nearby month. */

app/src/main/java/de/jeanlucmakiola/calendula/widget/agenda/AgendaWidget.kt

@@ -6,6 +6,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import androidx.datastore.preferences.core.stringPreferencesKey
 import androidx.glance.ColorFilter
 import androidx.glance.GlanceId
 import androidx.glance.GlanceModifier
@@ -24,6 +25,8 @@ import androidx.glance.appwidget.lazy.items
 import androidx.glance.appwidget.provideContent
 import androidx.glance.appwidget.updateAll
 import androidx.glance.background
+import androidx.glance.currentState
+import androidx.glance.state.PreferencesGlanceStateDefinition
 import androidx.glance.layout.Alignment
 import androidx.glance.layout.Box
 import androidx.glance.layout.Column
@@ -40,8 +43,16 @@ import androidx.glance.text.Text
 import androidx.glance.text.TextStyle
 import de.jeanlucmakiola.calendula.MainActivity
 import de.jeanlucmakiola.calendula.R
+import de.jeanlucmakiola.calendula.data.prefs.PastEventDisplay
+import de.jeanlucmakiola.calendula.data.prefs.parsePastEventDisplay
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.hasEnded
+import de.jeanlucmakiola.calendula.ui.agenda.AgendaRange
+import de.jeanlucmakiola.calendula.ui.agenda.dayCount
+import de.jeanlucmakiola.calendula.ui.agenda.parseAgendaRange
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
+import de.jeanlucmakiola.calendula.ui.common.EventDimAlpha
+import de.jeanlucmakiola.calendula.ui.common.formatTimeOfDay
 import de.jeanlucmakiola.calendula.ui.common.pastelize
 import de.jeanlucmakiola.calendula.widget.AgendaWidgetData
 import de.jeanlucmakiola.calendula.widget.CalendulaGlanceTheme
@@ -62,8 +73,28 @@ import java.util.Locale
  * of events grouped under day headers (the Google "Schedule" widget model).
  * Reuses the app's [groupAgendaDays] grouping so it matches the in-app agenda.
  */
+/**
+ * Per-instance Glance state key holding the agenda range (as [AgendaRange.storageValue]).
+ * The range is read reactively in the composition ([currentState]) so a settings
+ * change is reflected by plain recomposition — `updateAll` does NOT reliably
+ * re-run the `provideGlance` preamble for a live widget session, so loading the
+ * range there and slicing it would silently keep the stale value (mirrors the
+ * month widget's MONTH_INDEX_KEY approach).
+ */
+internal val AGENDA_RANGE_KEY = stringPreferencesKey("agenda_range")
+
+/**
+ * Per-instance Glance state key holding the past-event display mode (as
+ * [PastEventDisplay.name]). Read reactively in the composition for the same
+ * reason as [AGENDA_RANGE_KEY] — so toggling the setting reflects on the live
+ * widget without depending on the `provideGlance` preamble re-running.
+ */
+internal val AGENDA_PAST_DISPLAY_KEY = stringPreferencesKey("agenda_past_display")
+
 class AgendaWidget : GlanceAppWidget() {
 
+    override val stateDefinition = PreferencesGlanceStateDefinition
+
     override suspend fun provideGlance(context: Context, id: GlanceId) {
         val data = context.loadAgendaWidgetData()
         val dark = (context.resources.configuration.uiMode and
@@ -101,12 +132,36 @@ private fun AgendaWidgetBody(data: AgendaWidgetData, dark: Boolean) {
         Spacer(GlanceModifier.height(4.dp))
         when (data) {
             AgendaWidgetData.NeedsPermission -> WidgetMessage(R.string.widget_needs_permission)
-            is AgendaWidgetData.Ready ->
-                if (data.days.isEmpty()) {
+            is AgendaWidgetData.Ready -> {
+                // Range read reactively from per-instance Glance state (falls back
+                // to the saved pref for a freshly placed widget), then the wide
+                // pre-loaded window is sliced to it — pure recomposition.
+                val range = parseAgendaRange(currentState(AGENDA_RANGE_KEY), data.savedRange)
+                val pastDisplay =
+                    parsePastEventDisplay(currentState(AGENDA_PAST_DISPLAY_KEY), data.savedPastDisplay)
+                val rangeEnd = data.today.plus(
+                    range.dayCount(data.today, data.weekStart) - 1,
+                    DateTimeUnit.DAY,
+                )
+                // Slice to the chosen range, then drop finished events (and any day
+                // they leave empty) when the mode is Hide — so "Upcoming" really is.
+                val visibleDays = data.days
+                    .filter { it.date <= rangeEnd }
+                    .let { days ->
+                        if (pastDisplay == PastEventDisplay.HIDE) {
+                            days.mapNotNull { day ->
+                                val remaining = day.events.filterNot { it.hasEnded(data.now) }
+                                if (remaining.isEmpty()) null else day.copy(events = remaining)
+                            }
+                        } else {
+                            days
+                        }
+                    }
+                if (visibleDays.isEmpty()) {
                     WidgetMessage(R.string.agenda_empty_title)
                 } else {
                     val rows = buildList {
-                        data.days.forEach { day ->
+                        visibleDays.forEach { day ->
                             add(AgendaRow.Header(day.date, data.today))
                             day.events.forEach { add(AgendaRow.Event(it)) }
                         }
@@ -115,11 +170,18 @@ private fun AgendaWidgetBody(data: AgendaWidgetData, dark: Boolean) {
                         items(rows.size) { index ->
                             when (val row = rows[index]) {
                                 is AgendaRow.Header -> DayHeaderRow(row.date, row.today)
-                                is AgendaRow.Event -> EventRow(row.event, dark)
+                                is AgendaRow.Event -> EventRow(
+                                    event = row.event,
+                                    dark = dark,
+                                    is24Hour = data.is24Hour,
+                                    dimmed = pastDisplay == PastEventDisplay.DIM &&
+                                        row.event.hasEnded(data.now),
+                                )
                             }
                         }
                     }
                 }
+            }
         }
     }
 }
@@ -195,9 +257,15 @@ private fun DayHeaderRow(date: LocalDate, today: LocalDate) {
 }
 
 @Composable
-private fun EventRow(event: EventInstance, dark: Boolean) {
+private fun EventRow(event: EventInstance, dark: Boolean, is24Hour: Boolean, dimmed: Boolean) {
     val context = androidx.glance.LocalContext.current
     val title = event.title.ifBlank { context.getString(R.string.event_untitled) }
+    // Glance has no generic alpha modifier, so dim by fading the colour stripe and
+    // dropping both text lines to the lower-emphasis on-surface-variant tone.
+    val stripeColor = pastelize(event.color, dark).let {
+        if (dimmed) it.copy(alpha = EventDimAlpha) else it
+    }
+    val titleColor = if (dimmed) GlanceTheme.colors.onSurfaceVariant else GlanceTheme.colors.onSurface
     Row(
         modifier = GlanceModifier
             .fillMaxWidth()
@@ -220,17 +288,17 @@ private fun EventRow(event: EventInstance, dark: Boolean) {
                 .width(5.dp)
                 .height(36.dp)
                 .cornerRadius(3.dp)
-                .background(pastelize(event.color, dark)),
+                .background(stripeColor),
         ) {}
         Spacer(GlanceModifier.width(10.dp))
         Column(modifier = GlanceModifier.defaultWeight()) {
             Text(
                 text = title,
                 maxLines = 1,
-                style = TextStyle(color = GlanceTheme.colors.onSurface, fontSize = 14.sp),
+                style = TextStyle(color = titleColor, fontSize = 14.sp),
             )
             Text(
-                text = eventTimeSummary(context, event),
+                text = eventTimeSummary(context, event, is24Hour),
                 maxLines = 1,
                 style = TextStyle(color = GlanceTheme.colors.onSurfaceVariant, fontSize = 12.sp),
             )
@@ -269,17 +337,17 @@ private fun agendaDayLabel(context: Context, date: LocalDate, today: LocalDate):
     return if (relative != null) "$relative · $formatted" else formatted
 }
 
-private fun eventTimeSummary(context: Context, event: EventInstance): String {
+private fun eventTimeSummary(context: Context, event: EventInstance, is24Hour: Boolean): String {
     val time = if (event.isAllDay) {
         context.getString(R.string.event_detail_all_day)
     } else {
-        "${formatTime(event.start)} – ${formatTime(event.end)}"
+        "${formatTime(event.start, is24Hour)} – ${formatTime(event.end, is24Hour)}"
     }
     val location = event.location?.takeIf { it.isNotBlank() }
     return if (location != null) "$time · $location" else time
 }
 
-private fun formatTime(instant: Instant): String {
+private fun formatTime(instant: Instant, is24Hour: Boolean): String {
     val t = instant.toLocalDateTime(zone()).time
-    return "%02d:%02d".format(t.hour, t.minute)
+    return formatTimeOfDay(t.hour, t.minute, is24Hour, Locale.getDefault())
 }

app/src/main/res/values-de/strings.xml

@@ -13,7 +13,7 @@
 
     <!-- Permission-Flow (F1) -->
     <string name="permission_rationale_title">Alle Termine, schön im Blick</string>
-    <string name="permission_rationale_body">Calendula braucht Zugriff auf deinen Kalender, um deine Termine zu zeigen und zu verwalten. Mehr verlangt die App nie.</string>
+    <string name="permission_rationale_body">Calendula braucht Zugriff auf deinen Kalender, um deine Termine zu zeigen und zu verwalten. Mehr verlangt die App zu Beginn nicht — und nichts verlässt je dein Gerät.</string>
     <string name="permission_request_button">Kalender-Zugriff erlauben</string>
     <string name="permission_denied_title">Kalender-Zugriff abgelehnt</string>
     <string name="permission_denied_body">Ohne Kalender-Zugriff kann Calendula keine Termine anzeigen. Du kannst den Zugriff in den System-Einstellungen wieder erlauben.</string>
@@ -230,8 +230,7 @@
     <string name="agenda_today_action">Heute</string>
     <string name="agenda_header_today">Heute</string>
     <string name="agenda_header_tomorrow">Morgen</string>
-    <string name="agenda_empty_title">Nichts geplant</string>
-    <string name="agenda_empty_subtitle">Anstehende Termine erscheinen hier.</string>
+    <string name="agenda_empty_title">Alles erledigt</string>
 
     <!-- Terminsuche -->
     <string name="search_action">Suchen</string>
@@ -276,10 +275,35 @@
     <string name="settings_dynamic_color_unavailable">Erfordert Android 12 oder neuer</string>
     <string name="settings_week_start">Wochenstart</string>
     <string name="settings_week_start_auto">Automatisch</string>
-    <string name="settings_week_start_monday">Montag</string>
-    <string name="settings_week_start_sunday">Sonntag</string>
+    <string name="settings_time_format">Zeitformat</string>
+    <string name="settings_time_format_auto">Automatisch</string>
+    <string name="settings_time_format_12h">12-Stunden (2:00 PM)</string>
+    <string name="settings_time_format_24h">24-Stunden (14:00)</string>
+    <string name="settings_hour_lines">Stundenlinien</string>
+    <string name="settings_hour_lines_summary">Trennlinie zu jeder vollen Stunde in Wochen- und Tagesansicht anzeigen</string>
+    <string name="settings_agenda_range">Agenda-Zeitraum</string>
+    <string name="settings_agenda_range_hint">Wie weit im Voraus die Agenda-Ansicht Termine anzeigt.</string>
+    <string name="settings_agenda_widget_range">Agenda-Widget-Zeitraum</string>
+    <string name="settings_agenda_widget_range_hint">Wie weit im Voraus das Agenda-Widget auf dem Startbildschirm Termine anzeigt.</string>
+    <string name="settings_agenda_range_bar">Zeitraum-Leiste</string>
+    <string name="settings_agenda_range_bar_hint">Eine Leiste oben in der Agenda anzeigen, die den dargestellten Zeitraum benennt, mit einer Schaltfläche zum Wechseln des Zeitraums für die Sitzung</string>
+    <string name="agenda_range_day">Heute</string>
+    <string name="agenda_range_this_week">Diese Woche</string>
+    <string name="agenda_range_this_month">Dieser Monat</string>
+    <string name="agenda_range_week">Nächste 7 Tage</string>
+    <string name="agenda_range_month">Nächste 30 Tage</string>
+    <string name="agenda_range_custom">Benutzerdefiniert…</string>
+    <string name="agenda_range_custom_hint">Tage</string>
+    <string name="agenda_range_override_hint">Nur vorübergehend — wird beim erneuten Öffnen von Calendula auf deinen gespeicherten Zeitraum zurückgesetzt.</string>
+    <string name="agenda_range_showing_label">Alle anstehenden Termine für</string>
+    <plurals name="agenda_range_days">
+        <item quantity="one">%d Tag</item>
+        <item quantity="other">%d Tage</item>
+    </plurals>
     <string name="settings_section_event_form">Termin-Formular</string>
     <string name="settings_form_fields_hint">Standardmäßig angezeigte Felder — alles Weitere liegt hinter \"Weitere Felder\"</string>
+    <string name="settings_autofocus_title">Titel bei neuem Termin fokussieren</string>
+    <string name="settings_autofocus_title_hint">Beim Anlegen eines neuen Termins den Cursor direkt ins Titelfeld setzen und die Tastatur öffnen.</string>
     <string name="settings_color_unsupported">Farben auf nicht unterstützten Kalendern erlauben</string>
     <string name="settings_color_unsupported_hint">Manche Kalender (z. B. bestimmte CalDAV) stellen keine Farbpalette bereit; eine eigene Terminfarbe wird dort bei der nächsten Synchronisierung unter Umständen verworfen oder überschrieben. Das ist eine Einschränkung dieser Kalender und kann von Calendula nicht behoben werden.</string>
     <string name="settings_section_notifications">Benachrichtigungen</string>
@@ -292,7 +316,6 @@
     <string name="reminder_none">Keine</string>
     <string name="reminder_use_default">Standard-Erinnerung verwenden</string>
     <string name="reminder_custom_amount">Anzahl</string>
-    <string name="reminder_custom_with_value">Benutzerdefiniert (%1$s)</string>
     <string name="reminder_custom_set">Übernehmen</string>
     <string name="settings_calendar_reminders_hint">Standard pro Kalender überschreiben — getrennt für Termine mit Uhrzeit und ganztägige Termine. Ein Kalender kann den Standard übernehmen, weglassen oder einen eigenen festlegen.</string>
     <string name="settings_calendar_reminder_inherits">Standard (%1$s)</string>
@@ -315,6 +338,7 @@
     <string name="settings_license_value">MIT</string>
     <string name="settings_about_author">von Jean-Luc Makiola</string>
     <string name="settings_about_source">Quellcode</string>
+    <string name="settings_about_support">Entwicklung unterstützen</string>
     <string name="settings_about_version">Version %1$s</string>
     <string name="settings_about_logo_desc">Calendula-App-Symbol</string>
     <string name="settings_report_problem">Problem melden</string>
@@ -386,4 +410,38 @@
     <string name="crash_report_open_failed">Der Issue-Tracker konnte nicht geöffnet werden. Der Bericht ist in deiner Zwischenablage.</string>
     <string name="crash_report_body_template">Danke, dass du einen Absturz in Calendula meldest. Bitte ergänze, was du gerade getan hast, und sende dann ab.\n\n### Was ist passiert\n\n\n### Absturzbericht\n%1$s\n</string>
     <string name="crash_report_body_paste">_(Der Bericht war zu lang für diesen Link — füge ihn aus deiner Zwischenablage hier ein.)_</string>
+
+    <!-- Contact special dates (issue #15) -->
+    <string name="special_dates_calendar_birthday">Geburtstage</string>
+    <string name="special_dates_calendar_anniversary">Jahrestage</string>
+    <string name="special_dates_calendar_custom">Besondere Tage</string>
+    <string name="special_dates_default_title_birthday">{name}s Geburtstag ({year})</string>
+    <string name="special_dates_default_title_anniversary">{name}s Jahrestag ({year})</string>
+    <string name="special_dates_default_title_custom">{name}</string>
+    <string name="event_edit_managed_hint">Verwaltet von „%1$s“ — Titel, Datum und Wiederholung werden aus deinen Kontakten synchron gehalten. Erinnerungen, Ort und Notizen kannst du selbst bearbeiten.</string>
+    <string name="settings_special_dates_subtitle">Geburtstage &amp; Jahrestage aus Kontakten</string>
+    <string name="settings_section_special_dates">Besondere Kontakttage</string>
+    <string name="settings_special_dates_enable">Kontakttage anzeigen</string>
+    <string name="settings_special_dates_enable_hint">Spiegelt Geburtstage und weitere Daten deiner Kontakte in lokale Kalender. Liest Kontakte nur auf diesem Gerät — nichts wird hochgeladen, und deine Kontakte werden nie verändert.</string>
+    <string name="settings_special_dates_type_birthday">Geburtstage</string>
+    <string name="settings_special_dates_type_anniversary">Jahrestage</string>
+    <string name="settings_special_dates_type_custom">Weitere Tage</string>
+    <string name="settings_special_dates_template">Titelformat</string>
+    <string name="settings_special_dates_template_hint">Verwende {name} für den Kontakt und {year} für das Jahr (Geburtsjahr bzw. Startjahr eines Jahrestags; ausgeblendet, wenn unbekannt).</string>
+    <string name="settings_special_dates_reminders">Erinnerungen</string>
+    <string name="settings_special_dates_show_year">Jahr anzeigen</string>
+    <string name="settings_special_dates_show_year_hint">{year} in Titeln anzeigen, wenn es bekannt ist</string>
+    <string name="settings_special_dates_sync_now">Jetzt synchronisieren</string>
+    <string name="settings_special_dates_never_synced">Noch nicht synchronisiert</string>
+    <string name="settings_special_dates_last_synced">Zuletzt synchronisiert %1$s</string>
+    <string name="settings_special_dates_calendar_hint">Farbe und Sichtbarkeit jedes Kalenders legst du in den Kalender-Einstellungen fest.</string>
+    <string name="settings_calendar_reminders_managed_hint">In Besondere Kontakttage festgelegt</string>
+    <string name="settings_special_dates_paused_title">Pausiert</string>
+    <string name="settings_special_dates_paused_hint">Calendula kann deine Kontakte nicht mehr lesen, daher werden diese Kalender nicht aktualisiert.</string>
+    <string name="settings_special_dates_grant">Zugriff erlauben</string>
+    <string name="settings_special_dates_disable_title">Kontakttage deaktivieren?</string>
+    <string name="settings_special_dates_disable_all_message">Dadurch werden die Kontakttage-Kalender und ihre Termine gelöscht. Hinzugefügte Erinnerungen oder Notizen gehen verloren.</string>
+    <string name="settings_special_dates_disable_type_message">Dadurch werden der Kalender „%1$s“ und seine Termine gelöscht. Hinzugefügte Erinnerungen oder Notizen gehen verloren.</string>
+    <string name="settings_special_dates_disable_confirm">Deaktivieren</string>
+    <string name="dialog_save">Speichern</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -14,7 +14,7 @@
 
     <!-- Permission flow (F1) -->
     <string name="permission_rationale_title">See all your events, beautifully</string>
-    <string name="permission_rationale_body">Calendula needs access to your calendar to show and manage your events. That\'s the only thing it ever asks for.</string>
+    <string name="permission_rationale_body">Calendula needs access to your calendar to show and manage your events. That\'s all it asks for up front — and nothing ever leaves your device.</string>
     <string name="permission_request_button">Grant calendar access</string>
     <string name="permission_denied_title">Calendar access denied</string>
     <string name="permission_denied_body">Calendula cannot show events without calendar access. You can grant it again in the system settings.</string>
@@ -68,6 +68,8 @@
     <string name="event_edit_close">Close</string>
     <string name="event_edit_save">Save</string>
     <string name="event_edit_title_hint">Add title</string>
+    <!-- %1$s is the managing calendar's name, e.g. "Birthdays". -->
+    <string name="event_edit_managed_hint">Managed by “%1$s” — the title, date and repeat are kept in sync from your contacts. Reminders, location and notes are yours to edit.</string>
     <string name="event_edit_starts">Starts</string>
     <string name="event_edit_ends">Ends</string>
     <string name="event_edit_error_end_before_start">Ends before it starts</string>
@@ -197,6 +199,14 @@
         <item quantity="one">%d hour</item>
         <item quantity="other">%d hours</item>
     </plurals>
+    <plurals name="duration_days">
+        <item quantity="one">%d day</item>
+        <item quantity="other">%d days</item>
+    </plurals>
+    <plurals name="duration_weeks">
+        <item quantity="one">%d week</item>
+        <item quantity="other">%d weeks</item>
+    </plurals>
 
     <!-- Shared event strings -->
     <string name="event_untitled">(No title)</string>
@@ -231,8 +241,7 @@
     <string name="agenda_today_action">Today</string>
     <string name="agenda_header_today">Today</string>
     <string name="agenda_header_tomorrow">Tomorrow</string>
-    <string name="agenda_empty_title">Nothing scheduled</string>
-    <string name="agenda_empty_subtitle">Upcoming events will show up here.</string>
+    <string name="agenda_empty_title">You\'re all caught up</string>
 
     <!-- Event search -->
     <string name="search_action">Search</string>
@@ -269,10 +278,42 @@
     <string name="settings_dynamic_color_unavailable">Requires Android 12 or newer</string>
     <string name="settings_week_start">Week starts on</string>
     <string name="settings_week_start_auto">Automatic</string>
-    <string name="settings_week_start_monday">Monday</string>
-    <string name="settings_week_start_sunday">Sunday</string>
+    <string name="settings_time_format">Time format</string>
+    <string name="settings_time_format_auto">Automatic</string>
+    <string name="settings_time_format_12h">12-hour (2:00 PM)</string>
+    <string name="settings_time_format_24h">24-hour (14:00)</string>
+    <string name="settings_hour_lines">Hour lines</string>
+    <string name="settings_hour_lines_summary">Show a separator line at each hour in week and day view</string>
+    <string name="settings_dim_completed">Dim completed events</string>
+    <string name="settings_dim_completed_summary">Fade events that have already ended in month and week view</string>
+    <string name="settings_past_events">Past events</string>
+    <string name="settings_past_events_show">Show</string>
+    <string name="settings_past_events_dim">Dim</string>
+    <string name="settings_past_events_hide">Hide</string>
+    <string name="settings_agenda_header">Agenda</string>
+    <string name="settings_agenda_range">Agenda range</string>
+    <string name="settings_agenda_range_hint">How far ahead the Agenda screen lists events.</string>
+    <string name="settings_agenda_widget_range">Agenda widget range</string>
+    <string name="settings_agenda_widget_range_hint">How far ahead the agenda home-screen widget lists events.</string>
+    <string name="settings_agenda_range_bar">Range bar</string>
+    <string name="settings_agenda_range_bar_hint">Show a bar at the top of the agenda naming the dates shown, with a button to switch the range for the session</string>
+    <string name="agenda_range_day">Today</string>
+    <string name="agenda_range_this_week">This week</string>
+    <string name="agenda_range_this_month">This month</string>
+    <string name="agenda_range_week">Next 7 days</string>
+    <string name="agenda_range_month">Next 30 days</string>
+    <string name="agenda_range_custom">Custom…</string>
+    <string name="agenda_range_custom_hint">Days</string>
+    <string name="agenda_range_override_hint">Just for now — resets to your saved range when you reopen Calendula.</string>
+    <string name="agenda_range_showing_label">Showing all upcoming events for</string>
+    <plurals name="agenda_range_days">
+        <item quantity="one">%d day</item>
+        <item quantity="other">%d days</item>
+    </plurals>
     <string name="settings_section_event_form">New event form</string>
     <string name="settings_form_fields_hint">Fields shown by default — everything else sits behind \"More fields\"</string>
+    <string name="settings_autofocus_title">Focus title on new event</string>
+    <string name="settings_autofocus_title_hint">When you start a new event, place the cursor in the title field and open the keyboard right away.</string>
     <string name="settings_color_unsupported">Allow colors on unsupported calendars</string>
     <string name="settings_color_unsupported_hint">Some calendars (e.g. certain CalDAV) publish no color set; a custom event color may be dropped or overwritten on their next sync. That\'s a limitation of those calendars, not something Calendula can fix.</string>
     <string name="settings_section_notifications">Notifications</string>
@@ -285,8 +326,8 @@
     <string name="reminder_none">None</string>
     <string name="reminder_use_default">Use default reminder</string>
     <string name="reminder_custom_amount">Amount</string>
-    <string name="reminder_custom_with_value">Custom (%1$s)</string>
     <string name="reminder_custom_set">Set</string>
+    <string name="settings_calendar_reminders_title">Per-calendar reminders</string>
     <string name="settings_calendar_reminders_hint">Override the default per calendar — separately for timed and all-day events. A calendar can keep the default, drop it, or set its own.</string>
     <string name="settings_calendar_reminder_inherits">Default (%1$s)</string>
     <string name="settings_reliable_delivery">Reliable delivery</string>
@@ -299,15 +340,47 @@
     <string name="settings_section_language">Language</string>
     <string name="settings_language">App language</string>
     <string name="settings_language_auto">System default</string>
+    <string name="settings_translate">Help translate</string>
+    <string name="settings_translate_hint">Add or improve a language on Weblate</string>
     <!-- Hub category subtitles -->
     <string name="settings_appearance_subtitle">Theme, default view, week start</string>
     <string name="settings_event_form_subtitle">Default fields for new events</string>
     <string name="settings_notifications_subtitle">Event reminders</string>
+    <string name="settings_special_dates_subtitle">Contact birthdays &amp; anniversaries</string>
+
+    <!-- Contact special dates (issue #15) -->
+    <string name="settings_section_special_dates">Contact special dates</string>
+    <string name="settings_special_dates_enable">Show contact dates</string>
+    <string name="settings_special_dates_enable_hint">Mirror your contacts\' birthdays and other dates into local calendars. Reads contacts on this device only — nothing is uploaded, and your contacts are never changed.</string>
+    <string name="settings_special_dates_type_birthday">Birthdays</string>
+    <string name="settings_special_dates_type_anniversary">Anniversaries</string>
+    <string name="settings_special_dates_type_custom">Other dates</string>
+    <string name="settings_special_dates_template">Title format</string>
+    <string name="settings_special_dates_template_hint">Use {name} for the contact and {year} for the year (the birth year, or an anniversary\'s start year; hidden when unknown).</string>
+    <string name="settings_special_dates_reminders">Reminders</string>
+    <string name="settings_special_dates_show_year">Show year</string>
+    <string name="settings_special_dates_show_year_hint">Include {year} in titles when it is known</string>
+    <string name="settings_special_dates_sync_now">Sync now</string>
+    <string name="settings_special_dates_never_synced">Not synced yet</string>
+    <!-- %1$s is a relative time, e.g. "5 minutes ago". -->
+    <string name="settings_special_dates_last_synced">Last synced %1$s</string>
+    <string name="settings_special_dates_calendar_hint">Set each calendar\'s colour and visibility in Calendars settings.</string>
+    <string name="settings_calendar_reminders_managed_hint">Set in Contact special dates</string>
+    <string name="settings_special_dates_paused_title">Paused</string>
+    <string name="settings_special_dates_paused_hint">Calendula can no longer read your contacts, so these calendars aren\'t updating.</string>
+    <string name="settings_special_dates_grant">Grant access</string>
+    <string name="settings_special_dates_disable_title">Turn off contact dates?</string>
+    <string name="settings_special_dates_disable_all_message">This deletes the contact-date calendars and their events. Any reminders or notes you added to them will be lost.</string>
+    <!-- %1$s is the date type, e.g. "Birthdays". -->
+    <string name="settings_special_dates_disable_type_message">This deletes the “%1$s” calendar and its events. Any reminders or notes you added to them will be lost.</string>
+    <string name="settings_special_dates_disable_confirm">Turn off</string>
+    <string name="dialog_save">Save</string>
     <string name="settings_section_about">About</string>
     <string name="settings_license">License</string>
     <string name="settings_license_value">MIT</string>
     <string name="settings_about_author">by Jean-Luc Makiola</string>
     <string name="settings_about_source">Source</string>
+    <string name="settings_about_support">Support development</string>
     <string name="settings_about_version">Version %1$s</string>
     <string name="settings_about_logo_desc">Calendula app icon</string>
     <string name="settings_report_problem">Report a problem</string>
@@ -318,9 +391,14 @@
     <string name="calendars_local_header">Your calendars</string>
     <string name="calendars_local_empty">No local calendars yet. Create one to keep events on this device only.</string>
     <string name="calendars_add">Add calendar</string>
+    <string name="calendars_disable_hint">Turn a calendar off to remove it from the app — its events, filters and pickers. Nothing is deleted, and you can turn it back on here anytime.</string>
+    <string name="calendars_show_in_app_a11y">Show \"%1$s\" in the app</string>
     <string name="calendars_synced_header">Synced calendars</string>
     <string name="calendars_synced_hint">These come from accounts on your device. Create and edit them in their own app.</string>
-    <string name="calendars_manage_in_app">Manage</string>
+    <string name="calendars_manage_in_app">Manage in app</string>
+    <string name="calendars_account_menu_a11y">More options for %1$s</string>
+    <string name="calendars_enable_all">Enable all</string>
+    <string name="calendars_disable_all">Disable all</string>
     <string name="calendars_add_account">Add account</string>
     <string name="calendars_new_title">New calendar</string>
     <string name="calendars_edit_title">Edit calendar</string>
@@ -334,6 +412,26 @@
     <string name="calendars_backup_header">Backup</string>
     <string name="calendars_backup_hint">Local calendars aren\'t synced anywhere, so export them to an .ics file to keep a copy.</string>
     <string name="calendars_backup_action">Export as .ics file</string>
+    <string name="calendars_auto_backup">Automatic backup</string>
+    <string name="calendars_auto_backup_hint">Periodically export your local calendars to a folder as an .ics file.</string>
+    <string name="calendars_auto_backup_folder">Backup folder</string>
+    <string name="calendars_auto_backup_folder_unset">Tap to choose a folder</string>
+    <string name="calendars_auto_backup_interval">Interval</string>
+    <string name="calendars_auto_backup_every">Every %1$s</string>
+    <string name="calendars_auto_backup_interval_min">Minimum 30 minutes.</string>
+    <string name="calendars_auto_backup_status_never">No automatic backup yet</string>
+    <string name="calendars_auto_backup_status_ok">Last backup: %1$s</string>
+    <string name="calendars_auto_backup_status_failed">Last backup failed: %1$s</string>
+    <string name="backup_channel_name">Backup</string>
+    <string name="backup_channel_description">Warns if automatic backups fail repeatedly.</string>
+    <string name="backup_failed_title">Automatic backup failed</string>
+    <string name="backup_failed_text">Calendula couldn\'t write the backup file. Check the backup folder in Settings.</string>
+    <string-array name="backup_interval_units">
+        <item>Minutes</item>
+        <item>Hours</item>
+        <item>Days</item>
+        <item>Weeks</item>
+    </string-array>
     <string name="calendars_backup_failed">Couldn\'t export the backup.</string>
     <plurals name="calendars_backup_done">
         <item quantity="one">Exported %d event.</item>
@@ -378,6 +476,8 @@
 
     <string name="about_source_url" translatable="false">https://gitea.jeanlucmakiola.de/makiolaj/calendula</string>
     <string name="about_license_url" translatable="false">https://gitea.jeanlucmakiola.de/makiolaj/calendula/src/branch/main/LICENSE</string>
+    <string name="about_support_url" translatable="false">https://ko-fi.com/jeanlucmakiola</string>
+    <string name="about_translate_url" translatable="false">https://weblate.dev.jeanlucmakiola.de/engage/calendula/</string>
 
     <!-- Crash reporting: a captured report the user can submit, by hand, as a
          Gitea issue (the app sends nothing automatically). -->
@@ -393,4 +493,13 @@
     <string name="crash_report_body_paste">_(The report was too long for this link — paste it from your clipboard here.)_</string>
     <string name="report_issue_url" translatable="false">https://codeberg.org/jlmakiola/calendula/issues/new</string>
     <string name="report_issue_choose_url" translatable="false">https://codeberg.org/jlmakiola/calendula/issues/new/choose</string>
+
+    <!-- Contact special dates (issue #15). {name} is the contact, {age} the age
+         at the upcoming date (dropped when the year is unknown or Show age is off). -->
+    <string name="special_dates_calendar_birthday">Birthdays</string>
+    <string name="special_dates_calendar_anniversary">Anniversaries</string>
+    <string name="special_dates_calendar_custom">Special dates</string>
+    <string name="special_dates_default_title_birthday">{name}\'s birthday ({year})</string>
+    <string name="special_dates_default_title_anniversary">{name}\'s anniversary ({year})</string>
+    <string name="special_dates_default_title_custom">{name}</string>
 </resources>

app/src/test/java/de/jeanlucmakiola/calendula/data/calendar/CalendarRepositoryImplTest.kt

@@ -170,6 +170,74 @@ class CalendarRepositoryImplTest {
         }
     }
 
+    @Test
+    fun `instances drops events whose calendar the user disabled`(@TempDir tempDir: Path) = runTest {
+        val prefs = newPrefs(tempDir)
+        prefs.setDisabledCalendarIds(setOf(2L))
+        val fake = FakeCalendarDataSource().apply {
+            instancesResult = { _, _ ->
+                listOf(
+                    makeEvent(10L, "Enabled", calendarId = 1L),
+                    makeEvent(11L, "Disabled", calendarId = 2L),
+                )
+            }
+        }
+        val repo = CalendarRepositoryImpl(fake, prefs, newSettings(tempDir), UnconfinedTestDispatcher(testScheduler))
+
+        val range = Instant.fromEpochMilliseconds(0)..Instant.fromEpochMilliseconds(10_000L)
+        repo.instances(range).test {
+            assertThat(awaitItem().map { it.title }).containsExactly("Enabled")
+            cancelAndIgnoreRemainingEvents()
+        }
+    }
+
+    @Test
+    fun `instances applies the union of hidden and disabled sets`(@TempDir tempDir: Path) = runTest {
+        val prefs = newPrefs(tempDir)
+        prefs.setHiddenCalendarIds(setOf(2L))
+        prefs.setDisabledCalendarIds(setOf(3L))
+        val fake = FakeCalendarDataSource().apply {
+            instancesResult = { _, _ ->
+                listOf(
+                    makeEvent(10L, "Shown", calendarId = 1L),
+                    makeEvent(11L, "Hidden", calendarId = 2L),
+                    makeEvent(12L, "Disabled", calendarId = 3L),
+                )
+            }
+        }
+        val repo = CalendarRepositoryImpl(fake, prefs, newSettings(tempDir), UnconfinedTestDispatcher(testScheduler))
+
+        val range = Instant.fromEpochMilliseconds(0)..Instant.fromEpochMilliseconds(10_000L)
+        repo.instances(range).test {
+            assertThat(awaitItem().map { it.title }).containsExactly("Shown")
+            cancelAndIgnoreRemainingEvents()
+        }
+    }
+
+    @Test
+    fun `instances re-emits when the disabled set changes`(@TempDir tempDir: Path) = runTest {
+        val prefs = newPrefs(tempDir)
+        val fake = FakeCalendarDataSource().apply {
+            instancesResult = { _, _ ->
+                listOf(
+                    makeEvent(10L, "A", calendarId = 1L),
+                    makeEvent(11L, "B", calendarId = 2L),
+                )
+            }
+        }
+        val repo = CalendarRepositoryImpl(fake, prefs, newSettings(tempDir), UnconfinedTestDispatcher(testScheduler))
+
+        val range = Instant.fromEpochMilliseconds(0)..Instant.fromEpochMilliseconds(10_000L)
+        repo.instances(range).test {
+            assertThat(awaitItem().map { it.title }).containsExactly("A", "B").inOrder()
+
+            prefs.setDisabledCalendarIds(setOf(2L))
+
+            assertThat(awaitItem().map { it.title }).containsExactly("A")
+            cancelAndIgnoreRemainingEvents()
+        }
+    }
+
     @Test
     fun `createEvent delegates and returns the new id`(@TempDir tempDir: Path) = runTest {
         val fake = FakeCalendarDataSource().apply { nextInsertId = 77L }

app/src/test/java/de/jeanlucmakiola/calendula/data/calendar/EventWriteMapperTest.kt

@@ -199,11 +199,12 @@ class EventWriteMapperTest {
         assertThat(values[CalendarContract.Events.TITLE]).isEqualTo("Moved")
         assertThat(values[CalendarContract.Events.EVENT_LOCATION]).isEqualTo("Berlin")
         assertThat(values[CalendarContract.Events.DTSTART]).isEqualTo(1_781_164_800_000L)
-        assertThat(values[CalendarContract.Events.DTEND])
-            .isEqualTo(1_781_164_800_000L + 5_400_000L)
-        // A single occurrence never carries its own rule.
+        // The occurrence's length travels as DURATION, never DTEND — the provider
+        // rejects DTEND on an exception ("Exceptions can't overwrite dtend") and
+        // derives the end from DTSTART + DURATION, clearing the inherited RRULE.
+        assertThat(values[CalendarContract.Events.DURATION]).isEqualTo("P5400S")
+        assertThat(values).doesNotContainKey(CalendarContract.Events.DTEND)
         assertThat(values).doesNotContainKey(CalendarContract.Events.RRULE)
-        assertThat(values).doesNotContainKey(CalendarContract.Events.DURATION)
     }
 
     @Test

app/src/test/java/de/jeanlucmakiola/calendula/data/calendar/FakeCalendarDataSource.kt

@@ -1,12 +1,15 @@
 package de.jeanlucmakiola.calendula.data.calendar
 
+import android.provider.CalendarContract
 import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.EventColorOption
 import de.jeanlucmakiola.calendula.domain.EventDetail
 import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.contacts.SpecialDateType
 import de.jeanlucmakiola.calendula.domain.ics.IcsEvent
 import de.jeanlucmakiola.calendula.domain.ics.ParsedIcsEvent
+import java.time.ZoneId
 
 /**
  * Test-only fake. Tunable via the three `var` properties; `tick()` simulates
@@ -83,6 +86,8 @@ internal class FakeCalendarDataSource : CalendarDataSource {
     override fun deleteCalendar(id: Long) {
         writeError?.let { throw it }
         deletedCalendarIds += id
+        managedCalendarRows.removeAll { it.id == id }
+        managedEvents.remove(id)
     }
 
     /** All-day reminder fire-time minute-of-day passed into the last write. */
@@ -139,6 +144,80 @@ internal class FakeCalendarDataSource : CalendarDataSource {
     override fun deleteEvent(eventId: Long) {
         writeError?.let { throw it }
         deletedEventIds += eventId
+        managedEvents.values.forEach { rows -> rows.removeAll { it.eventId == eventId } }
+    }
+
+    // --- Managed special-dates surface (stateful, so a re-sync sees inserts) ---
+
+    var nextManagedEventId: Long = 1_000L
+    private var managedCalendarSeq: Long = 700L
+    private val managedCalendarRows = mutableListOf<ManagedCalendarRow>()
+    private val managedEvents = mutableMapOf<Long, MutableList<ManagedEventRow>>()
+
+    data class CreatedManagedCalendar(val displayName: String, val color: Int, val type: SpecialDateType)
+    val createdManagedCalendars = mutableListOf<CreatedManagedCalendar>()
+    val insertedManagedEvents = mutableListOf<Pair<EventForm, String>>()
+    val updatedManagedFields = mutableListOf<Pair<Long, Map<String, Any?>>>()
+
+    /** Preset an orphan managed calendar (e.g. to test adoption after a prefs wipe). */
+    fun presetManagedCalendar(id: Long, type: SpecialDateType) {
+        managedCalendarRows += ManagedCalendarRow(id, type)
+        managedEvents.getOrPut(id) { mutableListOf() }
+    }
+
+    override fun createManagedCalendar(displayName: String, color: Int, type: SpecialDateType): Long {
+        writeError?.let { throw it }
+        createdManagedCalendars += CreatedManagedCalendar(displayName, color, type)
+        val id = managedCalendarSeq++
+        managedCalendarRows += ManagedCalendarRow(id, type)
+        managedEvents.getOrPut(id) { mutableListOf() }
+        return id
+    }
+
+    override fun findManagedCalendars(): List<ManagedCalendarRow> = managedCalendarRows.toList()
+
+    override fun queryManagedEvents(calendarId: Long): List<ManagedEventRow> =
+        managedEvents[calendarId]?.toList() ?: emptyList()
+
+    override fun insertManagedEvent(form: EventForm, uid: String, allDayReminderTimeMinutes: Int): Long {
+        writeError?.let { throw it }
+        insertedManagedEvents += form to uid
+        allDayReminderTimes += allDayReminderTimeMinutes
+        val id = nextManagedEventId++
+        val times = form.toWriteTimes(ZoneId.systemDefault())
+        managedEvents.getOrPut(requireNotNull(form.calendarId)) { mutableListOf() } +=
+            ManagedEventRow(id, uid, form.title.trim(), times.dtStartMillis, form.rrule)
+        return id
+    }
+
+    /** (calendarId, allDayTime, minutes) recorded from applyManagedCalendarReminders. */
+    val appliedManagedReminders = mutableListOf<Triple<Long, Int, List<Int>>>()
+
+    override fun applyManagedCalendarReminders(
+        calendarId: Long,
+        allDayReminderTimeMinutes: Int,
+        minutes: List<Int>,
+    ) {
+        writeError?.let { throw it }
+        appliedManagedReminders += Triple(calendarId, allDayReminderTimeMinutes, minutes)
+    }
+
+    override fun updateManagedFields(eventId: Long, values: Map<String, Any?>) {
+        writeError?.let { throw it }
+        if (values.isEmpty()) return
+        updatedManagedFields += eventId to values
+        managedEvents.values.forEach { rows ->
+            val idx = rows.indexOfFirst { it.eventId == eventId }
+            if (idx >= 0) {
+                var row = rows[idx]
+                (values[CalendarContract.Events.TITLE] as? String)?.let { row = row.copy(title = it) }
+                (values[CalendarContract.Events.DTSTART] as? Long)?.let { row = row.copy(dtStartMillis = it) }
+                if (values.containsKey(CalendarContract.Events.RRULE)) {
+                    row = row.copy(rrule = values[CalendarContract.Events.RRULE] as? String)
+                }
+                rows[idx] = row
+            }
+        }
     }
 
     override fun deleteOccurrence(eventId: Long, beginMillis: Long) {

app/src/test/java/de/jeanlucmakiola/calendula/data/contacts/SpecialDatesSyncEngineTest.kt

@@ -0,0 +1,226 @@
+package de.jeanlucmakiola.calendula.data.contacts
+
+import android.provider.CalendarContract
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.PreferenceDataStoreFactory
+import androidx.datastore.preferences.core.Preferences
+import com.google.common.truth.Truth.assertThat
+import de.jeanlucmakiola.calendula.data.calendar.FakeCalendarDataSource
+import de.jeanlucmakiola.calendula.data.calendar.ManagedEventRow
+import de.jeanlucmakiola.calendula.data.prefs.CalendarReminderOverride
+import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
+import de.jeanlucmakiola.calendula.domain.contacts.ContactSpecialDate
+import de.jeanlucmakiola.calendula.domain.contacts.SpecialDateType
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.test.runTest
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.io.TempDir
+import java.nio.file.Path
+
+class SpecialDatesSyncEngineTest {
+
+    private class FakeContacts(
+        var permission: Boolean = true,
+        var dates: List<ContactSpecialDate> = emptyList(),
+    ) : ContactSpecialDatesDataSource {
+        override fun hasPermission() = permission
+        override fun readSpecialDates() = dates
+    }
+
+    private class FakeSpec : SpecialDatesCalendarSpec {
+        override fun displayName(type: SpecialDateType) = type.name
+        override fun color(type: SpecialDateType) = 0xFF112233.toInt()
+        override fun defaultTitleTemplate(type: SpecialDateType) = when (type) {
+            SpecialDateType.Birthday -> "{name}'s birthday ({year})"
+            SpecialDateType.Anniversary -> "{name}'s anniversary"
+            SpecialDateType.Custom -> "{name}"
+        }
+    }
+
+    private fun prefs(tempDir: Path): SettingsPrefs {
+        val store: DataStore<Preferences> = PreferenceDataStoreFactory.create(
+            produceFile = { tempDir.resolve("settings_test.preferences_pb").toFile() },
+        )
+        return SettingsPrefs(store)
+    }
+
+    private fun birthday(key: String, name: String, month: Int, day: Int, year: Int?) =
+        ContactSpecialDate(key, name, SpecialDateType.Birthday, month, day, year)
+
+    private suspend fun engineWith(
+        tempDir: Path,
+        contacts: FakeContacts,
+        calendars: FakeCalendarDataSource = FakeCalendarDataSource(),
+        enabled: Boolean = true,
+    ): Pair<SpecialDatesSyncEngine, SettingsPrefs> {
+        val settings = prefs(tempDir)
+        if (enabled) settings.setSpecialDatesEnabled(true)
+        return SpecialDatesSyncEngine(contacts, calendars, settings, FakeSpec()) to settings
+    }
+
+    @Test
+    fun `disabled feature is a no-op`(@TempDir tempDir: Path) = runTest {
+        val calendars = FakeCalendarDataSource()
+        val (engine, _) = engineWith(tempDir, FakeContacts(), calendars, enabled = false)
+        assertThat(engine.sync()).isEqualTo(SpecialDatesSyncResult.Disabled)
+        assertThat(calendars.createdManagedCalendars).isEmpty()
+    }
+
+    @Test
+    fun `missing permission reports stalled without touching calendars`(@TempDir tempDir: Path) = runTest {
+        val calendars = FakeCalendarDataSource()
+        val (engine, _) = engineWith(tempDir, FakeContacts(permission = false), calendars)
+        assertThat(engine.sync()).isEqualTo(SpecialDatesSyncResult.PermissionMissing)
+        assertThat(calendars.createdManagedCalendars).isEmpty()
+    }
+
+    @Test
+    fun `first sync creates calendars and inserts one event per contact`(@TempDir tempDir: Path) = runTest {
+        val calendars = FakeCalendarDataSource()
+        val contacts = FakeContacts(
+            dates = listOf(
+                birthday("a", "Jane", 5, 14, 1990),
+                birthday("b", "Bob", 12, 25, null),
+            ),
+        )
+        val (engine, settings) = engineWith(tempDir, contacts, calendars)
+
+        assertThat(engine.sync()).isEqualTo(SpecialDatesSyncResult.Success)
+        // All three type calendars exist; the birthday one holds both contacts.
+        assertThat(calendars.createdManagedCalendars.map { it.type })
+            .containsExactlyElementsIn(SpecialDateType.entries)
+        assertThat(calendars.insertedManagedEvents).hasSize(2)
+        assertThat(calendars.insertedManagedEvents.map { it.second })
+            .containsExactly("contact-birthday:a@calendula", "contact-birthday:b@calendula")
+        // Year-less contact drops the year; year-known keeps it.
+        val titles = calendars.insertedManagedEvents.map { it.first.title }
+        assertThat(titles).contains("Jane's birthday (1990)")
+        assertThat(titles).contains("Bob's birthday")
+        // Calendar ids were persisted for the editor / next sync.
+        assertThat(settings.specialDatesCalendars.first()).containsKey(SpecialDateType.Birthday)
+    }
+
+    @Test
+    fun `a second sync with no changes writes nothing`(@TempDir tempDir: Path) = runTest {
+        val calendars = FakeCalendarDataSource()
+        val contacts = FakeContacts(dates = listOf(birthday("a", "Jane", 5, 14, 1990)))
+        val (engine, _) = engineWith(tempDir, contacts, calendars)
+
+        engine.sync()
+        val insertsAfterFirst = calendars.insertedManagedEvents.size
+        val calendarsAfterFirst = calendars.createdManagedCalendars.size
+        engine.sync()
+
+        assertThat(calendars.insertedManagedEvents).hasSize(insertsAfterFirst)
+        assertThat(calendars.createdManagedCalendars).hasSize(calendarsAfterFirst)
+        assertThat(calendars.updatedManagedFields).isEmpty()
+        assertThat(calendars.deletedEventIds).isEmpty()
+    }
+
+    @Test
+    fun `a renamed contact triggers a title-only managed update`(@TempDir tempDir: Path) = runTest {
+        val calendars = FakeCalendarDataSource()
+        val contacts = FakeContacts(dates = listOf(birthday("a", "Jane", 5, 14, 1990)))
+        val (engine, _) = engineWith(tempDir, contacts, calendars)
+        engine.sync()
+
+        contacts.dates = listOf(birthday("a", "Janet", 5, 14, 1990))
+        engine.sync()
+
+        assertThat(calendars.updatedManagedFields).hasSize(1)
+        val (_, columns) = calendars.updatedManagedFields.single()
+        // Only managed columns are ever written — never reminders/location.
+        assertThat(columns.keys).containsExactly(CalendarContract.Events.TITLE)
+        assertThat(columns[CalendarContract.Events.TITLE]).isEqualTo("Janet's birthday (1990)")
+    }
+
+    @Test
+    fun `a removed contact deletes its event`(@TempDir tempDir: Path) = runTest {
+        val calendars = FakeCalendarDataSource()
+        val contacts = FakeContacts(dates = listOf(birthday("a", "Jane", 5, 14, 1990)))
+        val (engine, _) = engineWith(tempDir, contacts, calendars)
+        engine.sync()
+
+        contacts.dates = emptyList()
+        engine.sync()
+
+        assertThat(calendars.deletedEventIds).hasSize(1)
+    }
+
+    @Test
+    fun `disabling a type deletes its calendar on the next sync`(@TempDir tempDir: Path) = runTest {
+        val calendars = FakeCalendarDataSource()
+        val (engine, settings) = engineWith(tempDir, FakeContacts(), calendars)
+        engine.sync()
+        val anniversaryId = settings.specialDatesCalendars.first().getValue(SpecialDateType.Anniversary)
+
+        settings.setSpecialDateTypeEnabled(SpecialDateType.Anniversary, false)
+        engine.sync()
+
+        assertThat(calendars.deletedCalendarIds).contains(anniversaryId)
+        assertThat(settings.specialDatesCalendars.first()).doesNotContainKey(SpecialDateType.Anniversary)
+    }
+
+    @Test
+    fun `applyReminders persists the override and applies it to all events`(@TempDir tempDir: Path) = runTest {
+        val calendars = FakeCalendarDataSource()
+        val contacts = FakeContacts(dates = listOf(birthday("a", "Jane", 5, 14, 1990)))
+        val (engine, settings) = engineWith(tempDir, contacts, calendars)
+        engine.sync()
+        val birthdayCal = settings.specialDatesCalendars.first().getValue(SpecialDateType.Birthday)
+
+        engine.applyReminders(SpecialDateType.Birthday, CalendarReminderOverride.Minutes(listOf(0, 1440)))
+
+        // Persisted as the per-calendar all-day override (so new events match)...
+        assertThat(settings.perCalendarAllDayReminderOverride.first()[birthdayCal])
+            .isEqualTo(listOf(0, 1440))
+        // ...and applied to the existing events in that calendar.
+        assertThat(calendars.appliedManagedReminders).contains(
+            Triple(birthdayCal, settings.allDayReminderTimeMinutes.first(), listOf(0, 1440)),
+        )
+    }
+
+    @Test
+    fun `applyReminders with None clears the reminders`(@TempDir tempDir: Path) = runTest {
+        val calendars = FakeCalendarDataSource()
+        val (engine, settings) = engineWith(tempDir, FakeContacts(), calendars)
+        engine.sync()
+        val birthdayCal = settings.specialDatesCalendars.first().getValue(SpecialDateType.Birthday)
+
+        engine.applyReminders(SpecialDateType.Birthday, CalendarReminderOverride.None)
+
+        assertThat(settings.perCalendarAllDayReminderOverride.first()[birthdayCal]).isEmpty()
+        assertThat(calendars.appliedManagedReminders.last().third).isEmpty()
+    }
+
+    // --- pure diff ---
+
+    private fun desired(uid: String, title: String, dt: Long, rrule: String? = "FREQ=YEARLY") =
+        ManagedEventDesired(uid, title, dt, rrule)
+
+    private fun row(id: Long, uid: String, title: String, dt: Long, rrule: String? = "FREQ=YEARLY") =
+        ManagedEventRow(id, uid, title, dt, rrule)
+
+    @Test
+    fun `diff inserts new, deletes gone, and leaves unchanged alone`() {
+        val diff = diffManagedEvents(
+            desired = listOf(desired("keep", "Jane", 100), desired("new", "Ada", 200)),
+            existing = listOf(row(1, "keep", "Jane", 100), row(2, "gone", "Old", 300)),
+        )
+        assertThat(diff.insertUids).containsExactly("new")
+        assertThat(diff.deleteEventIds).containsExactly(2L)
+        assertThat(diff.updates).isEmpty()
+    }
+
+    @Test
+    fun `diff emits only the changed managed columns`() {
+        val diff = diffManagedEvents(
+            desired = listOf(desired("a", "Janet", 150)),
+            existing = listOf(row(9, "a", "Jane", 100)),
+        )
+        val update = diff.updates.single()
+        assertThat(update.eventId).isEqualTo(9L)
+        assertThat(update.columns.keys)
+            .containsExactly(CalendarContract.Events.TITLE, CalendarContract.Events.DTSTART)
+    }
+}

app/src/test/java/de/jeanlucmakiola/calendula/data/prefs/CalendarPrefsTest.kt

@@ -50,4 +50,34 @@ class CalendarPrefsTest {
         }
         assertThat(prefs.hiddenCalendarIds.first()).isEqualTo(setOf(1L, 3L))
     }
+
+    @Test
+    fun `disabledCalendarIds defaults to empty when unset`(@TempDir tempDir: Path) = runTest {
+        val prefs = CalendarPrefs(newDataStore(tempDir))
+        assertThat(prefs.disabledCalendarIds.first()).isEmpty()
+    }
+
+    @Test
+    fun `setDisabledCalendarIds round-trips through DataStore`(@TempDir tempDir: Path) = runTest {
+        val prefs = CalendarPrefs(newDataStore(tempDir))
+        prefs.setDisabledCalendarIds(setOf(1L, 42L, 7L))
+        assertThat(prefs.disabledCalendarIds.first()).isEqualTo(setOf(1L, 42L, 7L))
+    }
+
+    @Test
+    fun `setting empty disabled set clears storage`(@TempDir tempDir: Path) = runTest {
+        val prefs = CalendarPrefs(newDataStore(tempDir))
+        prefs.setDisabledCalendarIds(setOf(1L))
+        prefs.setDisabledCalendarIds(emptySet())
+        assertThat(prefs.disabledCalendarIds.first()).isEmpty()
+    }
+
+    @Test
+    fun `hidden and disabled sets are stored independently`(@TempDir tempDir: Path) = runTest {
+        val prefs = CalendarPrefs(newDataStore(tempDir))
+        prefs.setHiddenCalendarIds(setOf(1L))
+        prefs.setDisabledCalendarIds(setOf(2L))
+        assertThat(prefs.hiddenCalendarIds.first()).isEqualTo(setOf(1L))
+        assertThat(prefs.disabledCalendarIds.first()).isEqualTo(setOf(2L))
+    }
 }

app/src/test/java/de/jeanlucmakiola/calendula/data/prefs/SettingsPrefsTest.kt

@@ -5,6 +5,8 @@ import androidx.datastore.preferences.core.PreferenceDataStoreFactory
 import androidx.datastore.preferences.core.Preferences
 import com.google.common.truth.Truth.assertThat
 import de.jeanlucmakiola.calendula.domain.EventFormField
+import de.jeanlucmakiola.calendula.domain.contacts.SpecialDateType
+import de.jeanlucmakiola.calendula.ui.agenda.AgendaRange
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.test.runTest
 import kotlinx.datetime.DayOfWeek
@@ -25,7 +27,7 @@ class SettingsPrefsTest {
         val prefs = SettingsPrefs(newDataStore(tempDir))
         assertThat(prefs.themeMode.first()).isEqualTo(ThemeMode.SYSTEM)
         assertThat(prefs.dynamicColor.first()).isTrue()
-        assertThat(prefs.weekStart.first()).isEqualTo(WeekStartPref.AUTO)
+        assertThat(prefs.weekStart.first()).isEqualTo(WeekStartPref.Auto)
     }
 
     @Test
@@ -43,10 +45,70 @@ class SettingsPrefsTest {
     }
 
     @Test
-    fun `week start round-trips`(@TempDir tempDir: Path) = runTest {
+    fun `week start round-trips any day`(@TempDir tempDir: Path) = runTest {
         val prefs = SettingsPrefs(newDataStore(tempDir))
-        prefs.setWeekStart(WeekStartPref.SUNDAY)
-        assertThat(prefs.weekStart.first()).isEqualTo(WeekStartPref.SUNDAY)
+        prefs.setWeekStart(WeekStartPref.Day(DayOfWeek.SATURDAY))
+        assertThat(prefs.weekStart.first()).isEqualTo(WeekStartPref.Day(DayOfWeek.SATURDAY))
+    }
+
+    @Test
+    fun `legacy MONDAY week-start value migrates to Day`(@TempDir tempDir: Path) = runTest {
+        val store = newDataStore(tempDir)
+        val prefs = SettingsPrefs(store)
+        store.updateData { p ->
+            val m = p.toMutablePreferences()
+            m[SettingsPrefs.WEEK_START_KEY] = "MONDAY"
+            m
+        }
+        assertThat(prefs.weekStart.first()).isEqualTo(WeekStartPref.Day(DayOfWeek.MONDAY))
+    }
+
+    @Test
+    fun `garbage week-start value falls back to Auto`(@TempDir tempDir: Path) = runTest {
+        val store = newDataStore(tempDir)
+        val prefs = SettingsPrefs(store)
+        store.updateData { p ->
+            val m = p.toMutablePreferences()
+            m[SettingsPrefs.WEEK_START_KEY] = "FUNDAY"
+            m
+        }
+        assertThat(prefs.weekStart.first()).isEqualTo(WeekStartPref.Auto)
+    }
+
+    @Test
+    fun `time format defaults to auto and round-trips`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        assertThat(prefs.timeFormat.first()).isEqualTo(TimeFormatPref.AUTO)
+        prefs.setTimeFormat(TimeFormatPref.TWELVE_HOUR)
+        assertThat(prefs.timeFormat.first()).isEqualTo(TimeFormatPref.TWELVE_HOUR)
+    }
+
+    @Test
+    fun `hour lines default off and round-trips`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        assertThat(prefs.showHourLines.first()).isFalse()
+        prefs.setShowHourLines(true)
+        assertThat(prefs.showHourLines.first()).isTrue()
+    }
+
+    @Test
+    fun `autofocus event title defaults on and round-trips`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        assertThat(prefs.autofocusEventTitle.first()).isTrue()
+        prefs.setAutofocusEventTitle(false)
+        assertThat(prefs.autofocusEventTitle.first()).isFalse()
+    }
+
+    @Test
+    fun `agenda ranges default to month and round-trip independently`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        assertThat(prefs.agendaScreenRange.first()).isEqualTo(AgendaRange.Month)
+        assertThat(prefs.agendaWidgetRange.first()).isEqualTo(AgendaRange.Month)
+
+        prefs.setAgendaScreenRange(AgendaRange.Custom(14))
+        prefs.setAgendaWidgetRange(AgendaRange.Week)
+        assertThat(prefs.agendaScreenRange.first()).isEqualTo(AgendaRange.Custom(14))
+        assertThat(prefs.agendaWidgetRange.first()).isEqualTo(AgendaRange.Week)
     }
 
     @Test
@@ -122,22 +184,38 @@ class SettingsPrefsTest {
     }
 
     @Test
-    fun `default reminder is none until set`(@TempDir tempDir: Path) = runTest {
+    fun `default reminder is empty until set`(@TempDir tempDir: Path) = runTest {
         val prefs = SettingsPrefs(newDataStore(tempDir))
-        assertThat(prefs.defaultReminderMinutes.first()).isNull()
+        assertThat(prefs.defaultReminderMinutes.first()).isEmpty()
     }
 
     @Test
-    fun `default reminder round-trips, including none`(@TempDir tempDir: Path) = runTest {
+    fun `default reminder round-trips none, single, and multiple lead times`(@TempDir tempDir: Path) = runTest {
         val prefs = SettingsPrefs(newDataStore(tempDir))
-        prefs.setDefaultReminderMinutes(30)
-        assertThat(prefs.defaultReminderMinutes.first()).isEqualTo(30)
-        prefs.setDefaultReminderMinutes(null)
-        assertThat(prefs.defaultReminderMinutes.first()).isNull()
+        prefs.setDefaultReminderMinutes(listOf(30))
+        assertThat(prefs.defaultReminderMinutes.first()).containsExactly(30)
+        // Several lead times persist, normalised to distinct ascending order.
+        prefs.setDefaultReminderMinutes(listOf(10_080, 0, 30, 30))
+        assertThat(prefs.defaultReminderMinutes.first()).containsExactly(0, 30, 10_080).inOrder()
+        prefs.setDefaultReminderMinutes(emptyList())
+        assertThat(prefs.defaultReminderMinutes.first()).isEmpty()
     }
 
     @Test
-    fun `garbage stored default reminder reads as none`(@TempDir tempDir: Path) = runTest {
+    fun `legacy single-value default reminder parses as a one-element list`(@TempDir tempDir: Path) = runTest {
+        val store = newDataStore(tempDir)
+        val prefs = SettingsPrefs(store)
+        // The pre-multi-reminder format stored a bare integer string.
+        store.updateData { p ->
+            val m = p.toMutablePreferences()
+            m[SettingsPrefs.DEFAULT_REMINDER_KEY] = "30"
+            m
+        }
+        assertThat(prefs.defaultReminderMinutes.first()).containsExactly(30)
+    }
+
+    @Test
+    fun `garbage stored default reminder reads as empty`(@TempDir tempDir: Path) = runTest {
         val store = newDataStore(tempDir)
         val prefs = SettingsPrefs(store)
         store.updateData { p ->
@@ -145,7 +223,7 @@ class SettingsPrefsTest {
             m[SettingsPrefs.DEFAULT_REMINDER_KEY] = "soon"
             m
         }
-        assertThat(prefs.defaultReminderMinutes.first()).isNull()
+        assertThat(prefs.defaultReminderMinutes.first()).isEmpty()
     }
 
     @Test
@@ -153,16 +231,16 @@ class SettingsPrefsTest {
         val prefs = SettingsPrefs(newDataStore(tempDir))
         assertThat(prefs.perCalendarReminderOverride.first()).isEmpty()
 
-        prefs.setCalendarReminderOverride(7L, CalendarReminderOverride.Minutes(15))
+        prefs.setCalendarReminderOverride(7L, CalendarReminderOverride.Minutes(listOf(15, 10_080)))
         prefs.setCalendarReminderOverride(9L, CalendarReminderOverride.None)
         prefs.perCalendarReminderOverride.first().let { map ->
-            assertThat(map).containsExactly(7L, 15, 9L, null)
+            assertThat(map).containsExactly(7L, listOf(15, 10_080), 9L, emptyList<Int>())
         }
 
-        // Inherit drops the override entirely (absent != null value).
+        // Inherit drops the override entirely (absent != an empty-list value).
         prefs.setCalendarReminderOverride(9L, CalendarReminderOverride.Inherit)
         prefs.perCalendarReminderOverride.first().let { map ->
-            assertThat(map).containsExactly(7L, 15)
+            assertThat(map).containsExactly(7L, listOf(15, 10_080))
             assertThat(map.containsKey(9L)).isFalse()
         }
     }
@@ -170,48 +248,48 @@ class SettingsPrefsTest {
     @Test
     fun `all-day default round-trips, including none`(@TempDir tempDir: Path) = runTest {
         val prefs = SettingsPrefs(newDataStore(tempDir))
-        assertThat(prefs.defaultAllDayReminderMinutes.first()).isNull()
-        prefs.setDefaultAllDayReminderMinutes(1_440)
-        assertThat(prefs.defaultAllDayReminderMinutes.first()).isEqualTo(1_440)
-        prefs.setDefaultAllDayReminderMinutes(null)
-        assertThat(prefs.defaultAllDayReminderMinutes.first()).isNull()
+        assertThat(prefs.defaultAllDayReminderMinutes.first()).isEmpty()
+        prefs.setDefaultAllDayReminderMinutes(listOf(1_440))
+        assertThat(prefs.defaultAllDayReminderMinutes.first()).containsExactly(1_440)
+        prefs.setDefaultAllDayReminderMinutes(emptyList())
+        assertThat(prefs.defaultAllDayReminderMinutes.first()).isEmpty()
     }
 
     @Test
     fun `per-calendar all-day override round-trips independently of the timed one`(@TempDir tempDir: Path) = runTest {
         val prefs = SettingsPrefs(newDataStore(tempDir))
-        prefs.setCalendarReminderOverride(7L, CalendarReminderOverride.Minutes(15))
-        prefs.setCalendarAllDayReminderOverride(7L, CalendarReminderOverride.Minutes(1_440))
-        assertThat(prefs.perCalendarReminderOverride.first()).containsExactly(7L, 15)
-        assertThat(prefs.perCalendarAllDayReminderOverride.first()).containsExactly(7L, 1_440)
+        prefs.setCalendarReminderOverride(7L, CalendarReminderOverride.Minutes(listOf(15)))
+        prefs.setCalendarAllDayReminderOverride(7L, CalendarReminderOverride.Minutes(listOf(1_440)))
+        assertThat(prefs.perCalendarReminderOverride.first()).containsExactly(7L, listOf(15))
+        assertThat(prefs.perCalendarAllDayReminderOverride.first()).containsExactly(7L, listOf(1_440))
         // Clearing the all-day override leaves the timed one untouched.
         prefs.setCalendarAllDayReminderOverride(7L, CalendarReminderOverride.Inherit)
         assertThat(prefs.perCalendarAllDayReminderOverride.first()).isEmpty()
-        assertThat(prefs.perCalendarReminderOverride.first()).containsExactly(7L, 15)
+        assertThat(prefs.perCalendarReminderOverride.first()).containsExactly(7L, listOf(15))
     }
 
     @Test
     fun `resolveDefaultReminder picks the kind-matching override or global`() {
-        val timed = mapOf(7L to 15, 9L to null)
-        val allDay = mapOf(7L to 2_880)
+        val timed = mapOf(7L to listOf(15, 10_080), 9L to emptyList<Int>())
+        val allDay = mapOf(7L to listOf(2_880))
         fun resolve(calendarId: Long?, isAllDay: Boolean) = resolveDefaultReminder(
-            timedGlobal = 30,
-            allDayGlobal = 1_440,
+            timedGlobal = listOf(30),
+            allDayGlobal = listOf(1_440),
             timedOverrides = timed,
             allDayOverrides = allDay,
             calendarId = calendarId,
             isAllDay = isAllDay,
         )
-        // Timed: minutes override, explicit none, inherit global, no calendar.
-        assertThat(resolve(7L, isAllDay = false)).isEqualTo(15)
-        assertThat(resolve(9L, isAllDay = false)).isNull()
-        assertThat(resolve(5L, isAllDay = false)).isEqualTo(30)
-        assertThat(resolve(null, isAllDay = false)).isEqualTo(30)
+        // Timed: multi-value override, explicit none, inherit global, no calendar.
+        assertThat(resolve(7L, isAllDay = false)).containsExactly(15, 10_080).inOrder()
+        assertThat(resolve(9L, isAllDay = false)).isEmpty()
+        assertThat(resolve(5L, isAllDay = false)).containsExactly(30)
+        assertThat(resolve(null, isAllDay = false)).containsExactly(30)
         // All-day: its own override wins; absent → all-day global; a timed-only
         // override (cal 9) does not bleed into all-day.
-        assertThat(resolve(7L, isAllDay = true)).isEqualTo(2_880)
-        assertThat(resolve(9L, isAllDay = true)).isEqualTo(1_440)
-        assertThat(resolve(5L, isAllDay = true)).isEqualTo(1_440)
+        assertThat(resolve(7L, isAllDay = true)).containsExactly(2_880)
+        assertThat(resolve(9L, isAllDay = true)).containsExactly(1_440)
+        assertThat(resolve(5L, isAllDay = true)).containsExactly(1_440)
     }
 
     @Test
@@ -252,13 +330,70 @@ class SettingsPrefsTest {
 
     @Test
     fun `explicit week-start prefs resolve regardless of locale`() {
-        assertThat(WeekStartPref.MONDAY.resolveFirstDay(Locale.US)).isEqualTo(DayOfWeek.MONDAY)
-        assertThat(WeekStartPref.SUNDAY.resolveFirstDay(Locale.GERMANY)).isEqualTo(DayOfWeek.SUNDAY)
+        assertThat(WeekStartPref.Day(DayOfWeek.MONDAY).resolveFirstDay(Locale.US))
+            .isEqualTo(DayOfWeek.MONDAY)
+        assertThat(WeekStartPref.Day(DayOfWeek.SATURDAY).resolveFirstDay(Locale.GERMANY))
+            .isEqualTo(DayOfWeek.SATURDAY)
     }
 
     @Test
     fun `auto week start follows the locale convention`() {
-        assertThat(WeekStartPref.AUTO.resolveFirstDay(Locale.GERMANY)).isEqualTo(DayOfWeek.MONDAY)
-        assertThat(WeekStartPref.AUTO.resolveFirstDay(Locale.US)).isEqualTo(DayOfWeek.SUNDAY)
+        assertThat(WeekStartPref.Auto.resolveFirstDay(Locale.GERMANY)).isEqualTo(DayOfWeek.MONDAY)
+        assertThat(WeekStartPref.Auto.resolveFirstDay(Locale.US)).isEqualTo(DayOfWeek.SUNDAY)
+    }
+
+    @Test
+    fun `special dates feature is off with all types on by default`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        assertThat(prefs.specialDatesEnabled.first()).isFalse()
+        assertThat(prefs.specialDatesTypes.first()).isEqualTo(SpecialDateType.entries.toSet())
+        assertThat(prefs.specialDatesCalendars.first()).isEmpty()
+        assertThat(prefs.managedCalendarIds.first()).isEmpty()
+        assertThat(prefs.specialDatesShowYear.first()).isTrue()
+    }
+
+    @Test
+    fun `special date type toggles round-trip`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        prefs.setSpecialDateTypeEnabled(SpecialDateType.Anniversary, false)
+        assertThat(prefs.specialDatesTypes.first())
+            .isEqualTo(setOf(SpecialDateType.Birthday, SpecialDateType.Custom))
+    }
+
+    @Test
+    fun `managed calendar ids round-trip and drive managedCalendarIds`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        prefs.setSpecialDatesCalendarId(SpecialDateType.Birthday, 7L)
+        prefs.setSpecialDatesCalendarId(SpecialDateType.Anniversary, 9L)
+        assertThat(prefs.specialDatesCalendars.first())
+            .isEqualTo(mapOf(SpecialDateType.Birthday to 7L, SpecialDateType.Anniversary to 9L))
+        assertThat(prefs.managedCalendarIds.first()).isEqualTo(setOf(7L, 9L))
+
+        prefs.setSpecialDatesCalendarId(SpecialDateType.Birthday, null)
+        assertThat(prefs.specialDatesCalendars.first())
+            .isEqualTo(mapOf(SpecialDateType.Anniversary to 9L))
+    }
+
+    @Test
+    fun `title template round-trips per type`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        assertThat(prefs.specialDatesTitleTemplates.first()[SpecialDateType.Birthday]).isEmpty()
+        prefs.setSpecialDatesTitleTemplate(SpecialDateType.Birthday, "{name}'s birthday")
+        assertThat(prefs.specialDatesTitleTemplates.first()[SpecialDateType.Birthday])
+            .isEqualTo("{name}'s birthday")
+    }
+
+    @Test
+    fun `sync status records run and stalled reason`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        assertThat(prefs.specialDatesStatus.first())
+            .isEqualTo(SpecialDatesStatus(lastRun = 0L, stalled = null))
+
+        prefs.recordSpecialDatesRun(1000L, SpecialDatesStalledReason.PermissionRevoked)
+        assertThat(prefs.specialDatesStatus.first())
+            .isEqualTo(SpecialDatesStatus(1000L, SpecialDatesStalledReason.PermissionRevoked))
+
+        prefs.recordSpecialDatesRun(2000L, null)
+        assertThat(prefs.specialDatesStatus.first()).isEqualTo(SpecialDatesStatus(2000L, null))
     }
 }

app/src/test/java/de/jeanlucmakiola/calendula/data/reminders/PostableAlertsTest.kt

@@ -0,0 +1,55 @@
+package de.jeanlucmakiola.calendula.data.reminders
+
+import com.google.common.truth.Truth.assertThat
+import org.junit.jupiter.api.Test
+
+class PostableAlertsTest {
+
+    private fun alert(alertId: Long, calendarId: Long) = ReminderAlert(
+        alertId = alertId,
+        eventId = alertId * 10,
+        calendarId = calendarId,
+        beginMillis = 0L,
+        endMillis = 0L,
+        title = "Event $alertId",
+        location = null,
+        isAllDay = false,
+    )
+
+    @Test
+    fun `keeps alerts when no calendar is disabled`() {
+        val due = listOf(alert(1, calendarId = 100), alert(2, calendarId = 200))
+
+        val postable = postableAlerts(due, disabledCalendarIds = emptySet())
+
+        assertThat(postable).isEqualTo(due)
+    }
+
+    @Test
+    fun `drops alerts for a disabled calendar`() {
+        val keep = alert(1, calendarId = 100)
+        val drop = alert(2, calendarId = 200)
+
+        val postable = postableAlerts(listOf(keep, drop), disabledCalendarIds = setOf(200))
+
+        assertThat(postable).containsExactly(keep)
+    }
+
+    @Test
+    fun `drops every alert when all their calendars are disabled`() {
+        val due = listOf(alert(1, calendarId = 100), alert(2, calendarId = 100))
+
+        val postable = postableAlerts(due, disabledCalendarIds = setOf(100))
+
+        assertThat(postable).isEmpty()
+    }
+
+    @Test
+    fun `keeps multiple alerts from the same enabled calendar`() {
+        val due = listOf(alert(1, calendarId = 100), alert(2, calendarId = 100))
+
+        val postable = postableAlerts(due, disabledCalendarIds = setOf(999))
+
+        assertThat(postable).isEqualTo(due)
+    }
+}

app/src/test/java/de/jeanlucmakiola/calendula/data/reminders/ReminderTimeTextTest.kt

@@ -26,10 +26,24 @@ class ReminderTimeTextTest {
             isAllDay = false,
             zone = berlin,
             locale = Locale.GERMANY,
+            is24Hour = true,
         )
         assertThat(text).isEqualTo("09:30 – 10:00")
     }
 
+    @Test
+    fun `12-hour preference renders an am-pm time range`() {
+        val text = reminderTimeText(
+            beginMillis = millisAt(LocalDateTime.of(2026, 6, 11, 14, 0), berlin),
+            endMillis = millisAt(LocalDateTime.of(2026, 6, 11, 15, 0), berlin),
+            isAllDay = false,
+            zone = berlin,
+            locale = Locale.US,
+            is24Hour = false,
+        )
+        assertThat(text).isEqualTo("2:00 PM – 3:00 PM")
+    }
+
     @Test
     fun `timed event crossing midnight includes both dates`() {
         val text = reminderTimeText(
@@ -38,6 +52,7 @@ class ReminderTimeTextTest {
             isAllDay = false,
             zone = berlin,
             locale = Locale.GERMANY,
+            is24Hour = true,
         )
         assertThat(text).contains("11.06.2026")
         assertThat(text).contains("12.06.2026")
@@ -54,6 +69,7 @@ class ReminderTimeTextTest {
             // 02:00 in Berlin — naive local reading would shift the day.
             zone = berlin,
             locale = Locale.GERMANY,
+            is24Hour = true,
         )
         assertThat(text).isEqualTo("11.06.2026")
     }
@@ -66,6 +82,7 @@ class ReminderTimeTextTest {
             isAllDay = true,
             zone = berlin,
             locale = Locale.GERMANY,
+            is24Hour = true,
         )
         assertThat(text).isEqualTo("11.06.2026 – 12.06.2026")
     }
@@ -79,6 +96,7 @@ class ReminderTimeTextTest {
             isAllDay = true,
             zone = berlin,
             locale = Locale.GERMANY,
+            is24Hour = true,
         )
         assertThat(text).isEqualTo("11.06.2026")
     }

app/src/test/java/de/jeanlucmakiola/calendula/domain/contacts/ContactSpecialDateTest.kt

@@ -0,0 +1,64 @@
+package de.jeanlucmakiola.calendula.domain.contacts
+
+import com.google.common.truth.Truth.assertThat
+import org.junit.jupiter.api.Test
+
+class ContactSpecialDateTest {
+
+    @Test
+    fun `parses a full yyyy-MM-dd date with year`() {
+        val parts = parseContactEventDate("1990-05-14")
+        assertThat(parts).isEqualTo(ContactDateParts(year = 1990, month = 5, day = 14))
+    }
+
+    @Test
+    fun `parses a year-less --MM-dd date`() {
+        val parts = parseContactEventDate("--05-14")
+        assertThat(parts).isEqualTo(ContactDateParts(year = null, month = 5, day = 14))
+    }
+
+    @Test
+    fun `parses a compact yyyyMMdd date`() {
+        val parts = parseContactEventDate("19900514")
+        assertThat(parts).isEqualTo(ContactDateParts(year = 1990, month = 5, day = 14))
+    }
+
+    @Test
+    fun `parses a year-less MM-dd date without the double-dash prefix`() {
+        val parts = parseContactEventDate("12-25")
+        assertThat(parts).isEqualTo(ContactDateParts(year = null, month = 12, day = 25))
+    }
+
+    @Test
+    fun `keeps a year-less Feb 29 by validating against a leap anchor`() {
+        val parts = parseContactEventDate("--02-29")
+        assertThat(parts).isEqualTo(ContactDateParts(year = null, month = 2, day = 29))
+    }
+
+    @Test
+    fun `keeps Feb 29 in a real leap year`() {
+        assertThat(parseContactEventDate("2000-02-29"))
+            .isEqualTo(ContactDateParts(year = 2000, month = 2, day = 29))
+    }
+
+    @Test
+    fun `rejects Feb 29 in a non-leap year`() {
+        assertThat(parseContactEventDate("1999-02-29")).isNull()
+    }
+
+    @Test
+    fun `rejects an impossible month or day`() {
+        assertThat(parseContactEventDate("2020-13-01")).isNull()
+        assertThat(parseContactEventDate("2020-06-31")).isNull()
+        assertThat(parseContactEventDate("--00-10")).isNull()
+    }
+
+    @Test
+    fun `rejects blank, null and garbage input`() {
+        assertThat(parseContactEventDate(null)).isNull()
+        assertThat(parseContactEventDate("")).isNull()
+        assertThat(parseContactEventDate("   ")).isNull()
+        assertThat(parseContactEventDate("not-a-date")).isNull()
+        assertThat(parseContactEventDate("2020")).isNull()
+    }
+}

app/src/test/java/de/jeanlucmakiola/calendula/domain/contacts/SpecialDateFormattingTest.kt

@@ -0,0 +1,47 @@
+package de.jeanlucmakiola.calendula.domain.contacts
+
+import com.google.common.truth.Truth.assertThat
+import kotlinx.datetime.LocalDate
+import org.junit.jupiter.api.Test
+
+class SpecialDateFormattingTest {
+
+    private fun birthday(month: Int, day: Int, year: Int?) = ContactSpecialDate(
+        lookupKey = "k",
+        displayName = "Jane",
+        type = SpecialDateType.Birthday,
+        month = month,
+        day = day,
+        year = year,
+    )
+
+    @Test
+    fun `uid is deterministic and namespaced by type`() {
+        assertThat(managedEventUid(SpecialDateType.Birthday, "abc"))
+            .isEqualTo("contact-birthday:abc@calendula")
+        assertThat(managedEventUid(SpecialDateType.Anniversary, "abc"))
+            .isEqualTo("contact-anniversary:abc@calendula")
+    }
+
+    @Test
+    fun `anchor date uses the known year`() {
+        assertThat(birthday(5, 14, 1990).anchorDate()).isEqualTo(LocalDate(1990, 5, 14))
+    }
+
+    @Test
+    fun `anchor date falls back to a leap year when year-less`() {
+        assertThat(birthday(2, 29, null).anchorDate()).isEqualTo(LocalDate(YEARLESS_ANCHOR_YEAR, 2, 29))
+    }
+
+    @Test
+    fun `title substitutes name and year`() {
+        assertThat(renderSpecialDateTitle("{name}'s birthday ({year})", "Jane", 1990))
+            .isEqualTo("Jane's birthday (1990)")
+    }
+
+    @Test
+    fun `title drops an empty year parenthesis and tidies spacing`() {
+        assertThat(renderSpecialDateTitle("{name}'s birthday ({year})", "Jane", null))
+            .isEqualTo("Jane's birthday")
+    }
+}

app/src/test/java/de/jeanlucmakiola/calendula/ui/agenda/AgendaRangeTest.kt

@@ -0,0 +1,83 @@
+package de.jeanlucmakiola.calendula.ui.agenda
+
+import com.google.common.truth.Truth.assertThat
+import kotlinx.datetime.DayOfWeek
+import kotlinx.datetime.LocalDate
+import org.junit.jupiter.api.Test
+
+class AgendaRangeTest {
+
+    // A reference anchor: 2026-06-17 is a Wednesday.
+    private val wednesday = LocalDate(2026, 6, 17)
+
+    @Test
+    fun `rolling ranges have fixed 1, 7, 30 day counts regardless of anchor`() {
+        assertThat(AgendaRange.Day.dayCount(wednesday, DayOfWeek.MONDAY)).isEqualTo(1)
+        assertThat(AgendaRange.Week.dayCount(wednesday, DayOfWeek.MONDAY)).isEqualTo(7)
+        assertThat(AgendaRange.Month.dayCount(wednesday, DayOfWeek.MONDAY)).isEqualTo(30)
+    }
+
+    @Test
+    fun `this week runs through the day before the week repeats`() {
+        // Mon-start week: Wed → Wed,Thu,Fri,Sat,Sun = 5 days (everything before next Monday).
+        assertThat(AgendaRange.ThisWeek.dayCount(wednesday, DayOfWeek.MONDAY)).isEqualTo(5)
+        // On the first day of the week the whole 7 days remain.
+        val monday = LocalDate(2026, 6, 15)
+        assertThat(AgendaRange.ThisWeek.dayCount(monday, DayOfWeek.MONDAY)).isEqualTo(7)
+        // A Sunday-start week shifts the boundary: Wed → 4 days left (through Saturday).
+        assertThat(AgendaRange.ThisWeek.dayCount(wednesday, DayOfWeek.SUNDAY)).isEqualTo(4)
+    }
+
+    @Test
+    fun `this month runs through the last day of the month`() {
+        // June has 30 days: the 17th leaves 14 days (17..30 inclusive).
+        assertThat(AgendaRange.ThisMonth.dayCount(wednesday, DayOfWeek.MONDAY)).isEqualTo(14)
+        // February 2026 (non-leap) has 28 days.
+        assertThat(AgendaRange.ThisMonth.dayCount(LocalDate(2026, 2, 20), DayOfWeek.MONDAY))
+            .isEqualTo(9)
+    }
+
+    @Test
+    fun `custom day count is clamped to bounds`() {
+        assertThat(AgendaRange.Custom(45).dayCount(wednesday, DayOfWeek.MONDAY)).isEqualTo(45)
+        assertThat(AgendaRange.Custom(0).dayCount(wednesday, DayOfWeek.MONDAY))
+            .isEqualTo(AgendaRange.MIN_CUSTOM_DAYS)
+        assertThat(AgendaRange.Custom(9_999).dayCount(wednesday, DayOfWeek.MONDAY))
+            .isEqualTo(AgendaRange.MAX_CUSTOM_DAYS)
+    }
+
+    @Test
+    fun `fixed ranges round-trip through storage`() {
+        listOf(
+            AgendaRange.Day,
+            AgendaRange.Week,
+            AgendaRange.Month,
+            AgendaRange.ThisWeek,
+            AgendaRange.ThisMonth,
+        ).forEach { range ->
+            assertThat(parseAgendaRange(range.storageValue(), default = AgendaRange.Day))
+                .isEqualTo(range)
+        }
+    }
+
+    @Test
+    fun `custom range round-trips through storage`() {
+        val range = AgendaRange.Custom(14)
+        assertThat(range.storageValue()).isEqualTo("CUSTOM:14")
+        assertThat(parseAgendaRange("CUSTOM:14", default = AgendaRange.Day))
+            .isEqualTo(AgendaRange.Custom(14))
+    }
+
+    @Test
+    fun `garbage and null fall back to the default`() {
+        assertThat(parseAgendaRange(null, default = AgendaRange.Month)).isEqualTo(AgendaRange.Month)
+        assertThat(parseAgendaRange("YEAR", default = AgendaRange.Week)).isEqualTo(AgendaRange.Week)
+        assertThat(parseAgendaRange("CUSTOM:abc", default = AgendaRange.Day)).isEqualTo(AgendaRange.Day)
+    }
+
+    @Test
+    fun `out-of-range custom value clamps on parse`() {
+        assertThat(parseAgendaRange("CUSTOM:9999", default = AgendaRange.Day))
+            .isEqualTo(AgendaRange.Custom(AgendaRange.MAX_CUSTOM_DAYS))
+    }
+}

app/src/test/java/de/jeanlucmakiola/calendula/ui/common/TimeFormatTest.kt

@@ -0,0 +1,37 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import com.google.common.truth.Truth.assertThat
+import org.junit.jupiter.api.Test
+import java.util.Locale
+
+class TimeFormatTest {
+
+    @Test
+    fun `24-hour format is zero-padded HH mm`() {
+        assertThat(formatTimeOfDay(9, 5, is24Hour = true, Locale.US)).isEqualTo("09:05")
+        assertThat(formatTimeOfDay(14, 0, is24Hour = true, Locale.US)).isEqualTo("14:00")
+        assertThat(formatTimeOfDay(0, 0, is24Hour = true, Locale.US)).isEqualTo("00:00")
+    }
+
+    @Test
+    fun `12-hour format adds a localised am-pm marker`() {
+        assertThat(formatTimeOfDay(14, 0, is24Hour = false, Locale.US)).isEqualTo("2:00 PM")
+        assertThat(formatTimeOfDay(0, 30, is24Hour = false, Locale.US)).isEqualTo("12:30 AM")
+        assertThat(formatTimeOfDay(12, 0, is24Hour = false, Locale.US)).isEqualTo("12:00 PM")
+    }
+
+    @Test
+    fun `minute-of-day end-of-day renders 24 00 in 24h and midnight in 12h`() {
+        assertThat(formatMinuteOfDay(1_440, is24Hour = true, Locale.US)).isEqualTo("24:00")
+        assertThat(formatMinuteOfDay(1_440, is24Hour = false, Locale.US)).isEqualTo("12:00 AM")
+        assertThat(formatMinuteOfDay(13 * 60 + 15, is24Hour = true, Locale.US)).isEqualTo("13:15")
+    }
+
+    @Test
+    fun `hour label is zero-padded in 24h and compact am-pm in 12h`() {
+        assertThat(formatHourLabel(13, is24Hour = true, Locale.US)).isEqualTo("13")
+        assertThat(formatHourLabel(13, is24Hour = false, Locale.US)).isEqualTo("1 PM")
+        assertThat(formatHourLabel(1, is24Hour = false, Locale.US)).isEqualTo("1 AM")
+        assertThat(formatHourLabel(0, is24Hour = false, Locale.US)).isEqualTo("12 AM")
+    }
+}

docs/BUILDING.md

@@ -0,0 +1,24 @@
+# Building from source
+
+Calendula builds with the standard Android Gradle toolchain — no extra setup
+beyond the SDK and a JDK.
+
+## Requirements
+
+- **Android SDK 36+**
+- **JDK 17** — if your default JDK is not 17, set `JAVA_HOME` explicitly.
+
+The Gradle wrapper is checked in, so you don't need a system Gradle.
+
+## Common tasks
+
+```bash
+./gradlew assembleDebug   # debug APK → app/build/outputs/apk/debug/
+./gradlew test            # JVM unit tests
+./gradlew lint            # Android lint
+```
+
+## Release builds
+
+Release signing and the publishing pipeline are documented separately in
+[RELEASING.md](RELEASING.md).

docs/design/contact-special-dates.md

@@ -0,0 +1,248 @@
+# Design: Contact special-dates calendars (+ per-calendar multiple reminders)
+
+Status: **implemented** on `feat/contact-special-dates` (#14 prerequisite merged in)
+Date: 2026-06-30 (implemented 2026-07-01)
+Tracking: Codeberg #15 (feature), Codeberg #14 (prerequisite)
+
+Implementation notes / deviations from this design:
+
+- **Event identity key is a deterministic `Events.UID_2445`**
+  (`contact-<type>:<lookupKey>@calendula`), not `SYNC_DATA1`. On a LOCAL calendar
+  the provider drops `_sync` columns unless written through a sync-adapter URI;
+  `UID_2445` is written/read through the normal event URIs the app already uses
+  (and doubles as a stable iCal UID). The managed **calendar** still carries a
+  `CAL_SYNC2` marker for re-adoption (calendar-row writes already use the
+  sync-adapter URI).
+- **Year, not age.** A `FREQ=YEARLY` row has one static title, so a per-occurrence
+  age is impossible without per-year exception rows (rejected as too heavy). The
+  template instead offers `{year}` — the birth year (or an anniversary's start
+  year) — which is static and correct on every occurrence. A "Show year" toggle
+  gates it; it's in the default templates ("{name}'s birthday ({year})").
+- New managed calendars seed a per-calendar all-day reminder default of
+  on-the-day + one week before, so birthdays get lead time out of the box.
+- Title template is user-editable per type from day one (`{name}`, `{year}`).
+
+This document captures the full design for surfacing contact birthdays —
+and, by extension, anniversaries and custom dates — as auto-updating local
+calendars in Calendula. It also specifies #14 (per-calendar *multiple*
+default reminders), which is a hard prerequisite and ships first.
+
+The two pieces are deliberately split across **two branches / two
+shipments**:
+
+- `feat/per-calendar-multi-reminders` — #14, ships first.
+- `feat/contact-special-dates` — #15, builds on #14.
+
+They *may* release together depending on timing, but #14 is independently
+useful and is the foundation the special-dates calendars lean on.
+
+---
+
+## Why this is worth doing carefully
+
+Calendula's identity is privacy: **no INTERNET permission**, and historically
+**no `READ_CONTACTS`** — guest-picking uses a one-shot `ACTION_PICK` so the app
+never holds the contacts permission (`EventEditScreen.kt:446-460`).
+
+This feature **declares `READ_CONTACTS`** for the first time. That is a
+deliberate, owner-approved shift, mitigated by:
+
+- The permission is **opt-in and feature-gated** — requested only when the user
+  enables the feature, never at startup.
+- Everything stays **offline**. Contacts are read locally and mirrored into a
+  local calendar; nothing leaves the device.
+- The mirror is **one-way** (contacts → calendar). Calendula never writes to
+  Contacts.
+
+Store listing / About copy will need to explain the optional permission.
+
+---
+
+## Prerequisite — #14: per-calendar *multiple* default reminders
+
+### Today
+
+- Events already support **multiple reminders** — `EventForm.reminders:
+  List<Int>` (`EventForm.kt:24`), each written as a separate
+  `CalendarContract.Reminders` row (`CalendarDataSource.kt:620-630`), each
+  firing independently. The runtime/notification path is done.
+- The **defaults** layer is single-valued, though:
+  - Global: `defaultReminderMinutes` / `defaultAllDayReminderMinutes` — single
+    `Int` (`SettingsPrefs.kt:287,302`).
+  - Per-calendar override: `perCalendarReminderOverride: Map<Long, Int?>` and
+    the all-day variant (`SettingsPrefs.kt:350-381`), resolved by
+    `resolveDefaultReminder()` (`SettingsPrefs.kt:509-524`).
+  - UI: expandable per-calendar override section
+    (`SettingsScreen.kt:879-953`); `ReminderDefaultPicker` (`:956+`).
+
+### The change
+
+Widen the **defaults**, not the runtime, from one reminder to a list:
+
+1. Resolution model `Int` → `List<Int>` in global defaults + per-calendar
+   override + `resolveDefaultReminder()`. The DataStore string format already
+   parses `id=value;id=value` (`SettingsPrefs.kt:576-577`); `value` becomes a
+   comma-separated list. Keep the `Inherit / None / Minutes` override states
+   (`CalendarReminderOverride`, `SettingsPrefs.kt:493-500`) — `Minutes` carries
+   a list.
+2. `ReminderDefaultPicker` → multi-select. Mirror the event-form multi-reminder
+   UI rather than inventing new interaction.
+3. New events seed `EventForm.reminders` from the **resolved list** instead of
+   a single value.
+
+No new permissions, no provider changes, no scheduling changes. Type widening
+plus one picker upgrade.
+
+### Why it gates #15
+
+Each special-dates calendar is a normal local calendar, so it inherits the
+**per-calendar reminder default** for free. A birthdays calendar is useless
+without lead time (the reporter literally asked for "a week before *and* on the
+day") — that requires *multiple* defaults, i.e. #14.
+
+---
+
+## #15: Contact special-dates calendars
+
+### Core model: one-way mirror, one local calendar per type
+
+Contacts → **separate local calendars per type**:
+
+- "Birthdays"
+- "Anniversaries"
+- "Custom dates" (everything else / `TYPE_OTHER` / `TYPE_CUSTOM`)
+
+Separate-per-type is the key architectural decision: each is a normal local
+calendar (`createLocalCalendar()`, `CalendarDataSource.kt:238-260`), so the
+**existing per-calendar infra applies for free**:
+
+- **Color** → existing per-calendar color.
+- **Show/hide** → existing calendar visibility.
+- **Default reminders** → per-calendar override from #14.
+
+This shrinks the new surface dramatically: anniversaries and custom dates are
+near copy-paste of birthdays (same engine, different `ContactsContract` data
+kind, one extra local calendar each), and the settings sub-page does **not**
+need to reinvent color/visibility/reminders.
+
+### Events: field-level managed, not read-only
+
+Calendula manages a few fields; the user owns the rest.
+
+- **Managed** (overwritten on every sync, disabled in the editor for these
+  events): title, start date, recurrence (`FREQ=YEARLY`), existence.
+- **User-owned** (seeded once on insert, never touched again by sync):
+  location, reminders, notes, busy/free.
+
+The rule that makes this safe: sync performs a **targeted column update**
+(managed columns only), **never delete-and-reinsert**. Reminders live in
+separate rows, so once seeded they are simply never re-touched. A user can move
+a birthday reminder to "2 weeks before" or add a location and neither is
+clobbered.
+
+In the editor, when an event belongs to a managed calendar: disable the
+title/date/recurrence fields; allow the rest.
+
+### Reconciliation identity
+
+Stamp each event with the contact's `LOOKUP_KEY` in `Events.SYNC_DATA1` (ours,
+since it's a local calendar). Sync becomes an idempotent diff keyed on it:
+
+- contact added → insert
+- birthday/date changed → targeted update of managed columns
+- contact or date removed → delete the event
+
+Getting this wrong = duplicate birthdays on every sync, so the identity key is
+non-negotiable.
+
+### Data source
+
+`ContactsContract.Data` rows of `Event.CONTENT_ITEM_TYPE`, split by
+`Event.TYPE`:
+
+- `TYPE_BIRTHDAY` → Birthdays calendar
+- `TYPE_ANNIVERSARY` → Anniversaries calendar
+- `TYPE_OTHER` / `TYPE_CUSTOM` (+ label) → Custom dates calendar
+
+### Dates: year-less + age
+
+Many contacts store `--MM-DD` (no year). Handle both:
+
+- **Year present:** anchor `DTSTART` at that year; `FREQ=YEARLY`. We can show
+  age ("Jane turns 30") when the show-age option is on.
+- **Year absent:** `FREQ=YEARLY` from an arbitrary anchor year; no age shown.
+
+Recurrence support is already there: `FREQ=YEARLY` + `UNTIL`/`COUNT`/`INTERVAL`
+(`Recurrence.kt:32-174`).
+
+### Auto-update cadence
+
+Birthdays change rarely, so nothing live/expensive:
+
+- Sync **on enable**, **on app foreground**, and a **daily WorkManager** job
+  (catches new/edited/deleted contacts even if the app isn't opened).
+- **No `ContentObserver`** — needs the process alive and buys almost nothing
+  for once-a-year events.
+
+### Permission + lifecycle
+
+- **Enable:** request `READ_CONTACTS` (feature-gated, contextual — mirror the
+  contextual `WRITE_CALENDAR` pattern at `EventEditScreen.kt:216-231`). On
+  grant, create the enabled calendars and run the first sync.
+- **Disable:** delete the managed calendars + their events (with a confirm).
+- **Permission revoked in system settings:** detect on next sync; surface that
+  the feature is stalled rather than failing silently.
+
+### Configurable settings sub-page
+
+Enabling the feature reveals a **dedicated sub-page** (not inline rows). Because
+color/visibility/reminders already live in normal calendar settings, the
+sub-page only carries the genuinely new knobs:
+
+- Master enable toggle.
+- Per-type toggles: Birthdays / Anniversaries / Custom dates.
+- Title/display template, e.g. `"{name}'s birthday"` (new translatable string).
+- Show-age toggle (only meaningful when the year is known).
+- (Possibly) sync-cadence / "sync now".
+- Pointer to the normal calendar settings for color, visibility, reminders.
+
+The owner wants this broadly configurable — keep the sub-page the home for
+display/behaviour options, and lean on existing per-calendar settings for the
+rest.
+
+---
+
+## Open questions / deferred
+
+- Title template: free-form vs a small set of presets. Start with one good
+  localized default; revisit configurability.
+- Whether "Custom dates" is one bucket or split further by label. Start: one
+  bucket.
+- Contact scope: all contacts vs per-account/group filtering. Start: all;
+  filtering is a later refinement.
+
+## Task outline
+
+### #14 — per-calendar multiple default reminders (`feat/per-calendar-multi-reminders`)
+- [x] Widen global + per-calendar reminder defaults `Int` → `List<Int>`
+      (`SettingsPrefs.kt`), keep `Inherit/None/Minutes(list)`.
+- [x] `resolveDefaultReminder()` returns a list.
+- [x] `ReminderDefaultPicker` → multi-select (mirror event-form UI).
+- [x] Seed new events' `EventForm.reminders` from the resolved list.
+- [x] Migration / parse compatibility for existing single-value stored prefs.
+- [x] Tests: resolution, parse round-trip, all-day variant.
+
+### #15 — contact special-dates (`feat/contact-special-dates`)
+- [x] Declare `READ_CONTACTS`; feature-gated contextual request on enable.
+- [x] Per-type local calendars (create on enable, delete on disable+confirm).
+- [x] Contacts reader: `Event` rows by `TYPE`, year-less handling.
+- [x] Sync engine: idempotent diff keyed on the deterministic `UID_2445`
+      (see notes; not `SYNC_DATA1`); targeted managed-column updates; seed
+      user-owned fields on insert only.
+- [x] `FREQ=YEARLY` event generation + `{year}` in titles (static, always correct).
+- [x] Auto-update: on enable, on foreground, daily WorkManager.
+- [x] Editor: disable managed fields for managed-calendar events.
+- [x] Revoked-permission detection + stalled-state surface.
+- [x] Settings sub-page: enable, per-type toggles, title template, show-age.
+- [x] Translatable strings (titles, sub-page).
+- [x] About / store copy for the optional `READ_CONTACTS` permission.

docs/fdroid-official/de.jeanlucmakiola.calendula.yml

@@ -21,6 +21,7 @@ AuthorName: Jean-Luc Makiola
 SourceCode: https://gitea.jeanlucmakiola.de/makiolaj/calendula
 IssueTracker: https://gitea.jeanlucmakiola.de/makiolaj/calendula/issues
 Changelog: https://gitea.jeanlucmakiola.de/makiolaj/calendula/src/branch/main/CHANGELOG.md
+Donate: https://ko-fi.com/jeanlucmakiola
 
 AutoName: Calendula
 

fastlane/metadata/android/de-DE/full_description.txt

@@ -10,6 +10,12 @@ Serie) und einem einfachen Wiederholungs-Picker. Erinnerungen stellt
 Calendula selbst als Benachrichtigung zu — ein Tipp darauf öffnet den
 Termin.
 
+Optional lassen sich Geburtstage, Jahrestage und weitere besondere Tage
+deiner Kontakte im Kalender anzeigen. Du schaltest das selbst ein; Kontakte
+werden nur auf deinem Gerät gelesen, nie hochgeladen und nie verändert —
+Calendula spiegelt die Daten lediglich in lokale Kalender, die du voll
+kontrollierst.
+
 Der Unterschied liegt im Design: echtes Material 3 Expressive durchgehend,
 mit Dynamic Color, expressiven Animationen und neuen Shape-Sprachen.
 

fastlane/metadata/android/en-US/changelogs/21000.txt

@@ -0,0 +1,14 @@
+### Added
+- Turn a calendar off across the whole app. Settings → Calendars now has a
+  switch on every calendar — both your own and synced ones. Switching one off
+  removes it everywhere: its events disappear from all views and search, and it
+  drops out of the drawer's hide/show filter, the event-form calendar picker and
+  the import target picker. Unlike hiding (the quick per-view checkbox in the
+  drawer), a disabled calendar leaves the app entirely until you turn it back on.
+  Nothing is deleted and no other app is affected — it's a Calendula-only view
+  choice — so you can re-enable it any time from the same screen, where disabled
+  calendars stay listed but dimmed.
+- An optional way to support development. Settings → About now has a "Support
+  development" button that opens Ko-fi in your browser. It's a plain donation
+  link with no perks attached, and it needs no new permissions — Calendula still
+  has no internet access of its own and just hands the link to your browser.

fastlane/metadata/android/en-US/changelogs/21100.txt

@@ -0,0 +1,50 @@
+### Added
+- Start the week on any day. The **Week starts on** setting (Settings →
+  Appearance) now offers every weekday — not just Monday or Sunday — alongside
+  the automatic, locale-based default. Thanks to @zmaherdev for the suggestion
+  ([#3]).
+- Choose a 12- or 24-hour clock. A new **Time format** setting (Settings →
+  Appearance) lets you force a 12-hour (2:00 PM) or 24-hour (14:00) clock, or
+  follow the system setting automatically. It applies everywhere times appear —
+  the week and day timelines, agenda, event details, search and reminders — so
+  the format is now consistent across the whole app. Thanks to @zmaherdev for
+  the suggestion ([#6]).
+- Optional hour lines in the timeline. A new **Hour lines** switch (Settings →
+  Appearance) draws a faint separator at each hour in the week and day views,
+  making it easier to see when events start and end. Off by default. Thanks to
+  @zmaherdev for the suggestion ([#5]).
+- Limit how far ahead the agenda looks, and switch it on the fly. New **Agenda
+  range** and **Agenda widget range** settings (Settings → Appearance) let the
+  agenda screen and its home-screen widget each show just today, the rest of this
+  week, the rest of this month, a rolling 7 or 30 days, or a custom number of
+  days — "This week" follows your week-start. The agenda also gains a bar at the
+  top naming the exact dates in view, with a button to switch the range just for
+  the current session (it resets when you reopen the app); the bar can be turned
+  off. Thanks to @zmaherdev for the suggestion ([#4]).
+- Automatic backup of local calendars. A new **Automatic backup** option
+  (Settings → Calendars → Backup) periodically exports your local calendars to an
+  `.ics` file in a folder you choose, on an interval you set (from 30 minutes up).
+  Useful for file-based syncing such as Syncthing, or simply as a safety net — it
+  is a one-way export and never touches your synced accounts. Thanks to @shield
+  for the discussion that inspired it ([#7], [#8]).
+- Field icons in the event-form settings. Each optional-field toggle (Settings →
+  Event form) now shows the same icon the field uses in the new-event form, so
+  the list is easier to scan.
+- Help translate Calendula. A **Help translate** link at the top of **Settings →
+  App language** opens the project's Weblate, where you can add or improve a
+  language in your browser — no coding needed. Contributions in any language are
+  welcome.
+
+### Changed
+- Tidied **Settings → Appearance** into clearer groups (theme & colour, calendar,
+  agenda), and the agenda's empty state now reads "You're all caught up".
+- Reworked **Settings → Calendars**. Local and synced calendars are now grouped
+  into collapsible, source-branded cards — each account shows its app's icon —
+  with a per-account menu to enable or disable all of its calendars at once or
+  open the account in its source app.
+- Reorganised **Settings → Notifications**: reliable-delivery and snooze settings
+  moved up with the other global reminder options, and the per-calendar reminder
+  overrides now fold into a single expandable section.
+- Moved **Add Quick Settings tile** out of the event-form section to its own
+  top-level entry in Settings.
+

fastlane/metadata/android/en-US/changelogs/21101.txt

@@ -0,0 +1,6 @@
+### Fixed
+- Calendula can now be set as your default calendar app. It registers the
+  calendar-app intent filters the system uses, so it appears in the chooser when
+  you tap a date in a launcher or clock — and opening one takes you straight to
+  that day. Android has no way for an app to make itself the default, so you pick
+  it once from the system picker. Thanks to @abrossimow for the report ([#9]).

fastlane/metadata/android/en-US/changelogs/21102.txt

@@ -0,0 +1,7 @@
+### Added
+- Jump straight to typing a title. When you start a new event, Calendula now puts
+  the cursor in the title field and opens the keyboard right away, so you can type
+  the name without an extra tap. It's on by default and only affects creating an
+  event — editing never grabs focus — and a new **Focus title on new event**
+  switch (Settings → New event form) turns it off. Thanks to @abrossimow for the
+  suggestion ([#10]).

fastlane/metadata/android/en-US/changelogs/21200.txt

@@ -0,0 +1,19 @@
+### Added
+- See past events your way. Two new settings change how events that have already
+  ended are shown. **Past events** (Settings → Appearance → Agenda) lets the
+  agenda — both in the app and the home-screen "Upcoming" widget — keep them as
+  usual, dim them, or hide them from the list entirely. **Dim completed events**
+  (Settings → Appearance) separately fades finished events in the month and week
+  views. Both are off by default, an event only counts as finished once it has
+  actually ended (events still in progress are never dimmed), and the lists
+  update on their own as the day goes on. Thanks to @ptab for the suggestion
+  ([#12]).
+
+### Changed
+- Readable titles on overlapping events. In the week and day views, events that
+  overlap split a day into slim columns where the title used to be clipped to a
+  character or two. The title now wraps across as many lines as the block can
+  fit, and the time is hidden on those narrow blocks so the name can fill the
+  space — so you can tell events apart without opening each one. Thanks to @ptab
+  for the suggestion ([#13]).
+

fastlane/metadata/android/en-US/full_description.txt

@@ -8,6 +8,11 @@ changes (only this event / this and all following / the whole series) and a
 simple repeat picker. Calendula also delivers your event reminders as
 notifications — tap one and you're on the event.
 
+Optionally, show your contacts' birthdays, anniversaries and other special
+dates in your calendar. You turn this on yourself; contacts are read only on
+your device, are never uploaded, and are never changed — Calendula only
+mirrors the dates into local calendars you fully control.
+
 The differentiator is the design: real Material 3 Expressive throughout,
 with dynamic color, expressive motion, and expressive shapes.
 

fdroid-metadata/de.jeanlucmakiola.calendula.yml

@@ -8,3 +8,4 @@ Categories:
 
 SourceCode: https://gitea.jeanlucmakiola.de/makiolaj/calendula
 IssueTracker: https://gitea.jeanlucmakiola.de/makiolaj/calendula/issues
+Donate: https://ko-fi.com/jeanlucmakiola

gradle/libs.versions.toml

@@ -26,10 +26,14 @@ lifecycleCompose = "2.10.0"
 androidxTestRules = "1.7.0"
 # Glance: 1.1.1 is the latest stable (1.2.0 is still rc, 1.3.0 alpha).
 glance = "1.1.1"
+work = "2.10.1"
+documentfile = "1.0.1"
 
 [libraries]
 # AndroidX core
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
+androidx-work-runtime-ktx = { group = "androidx.work", name = "work-runtime-ktx", version.ref = "work" }
+androidx-documentfile = { group = "androidx.documentfile", name = "documentfile", version.ref = "documentfile" }
 androidx-appcompat = { group = "androidx.appcompat", name = "appcompat", version.ref = "appcompat" }
 androidx-lifecycle-runtime-ktx = { group = "androidx.lifecycle", name = "lifecycle-runtime-ktx", version.ref = "lifecycleRuntime" }
 androidx-activity-compose = { group = "androidx.activity", name = "activity-compose", version.ref = "activityCompose" }