Jean-Luc Makiola
4fea176e28
The cancelled-exception fix works on synced calendars but not local ones. A cancelled exception only attaches to its parent through ORIGINAL_SYNC_ID; a local event has no _sync_id, so the link never forms and the provider's expansion of the *parent* collapses — every other occurrence disappears, which is the original #47 corruption, just on a different calendar type. Verified on-device both ways: a DAVx5 series survives a single-occurrence delete, the same series on a LOCAL calendar vanishes entirely. deleteOccurrence now branches on _sync_id. Synced events keep the (verified) exception path. Events without one — local calendars, and synced events not yet pushed — add the occurrence to the master's EXDATE, which needs no parent link and is the canonical iCalendar way to drop one; a sync adapter carries it upstream unchanged if the calendar later syncs. Two provider quirks shape the write (both observed on a Pixel): - An EXDATE-only update is not treated as a recurrence change: the expanded Instances rows are left alone, so the occurrence stays visible. The time/recurrence set has to ride along to force re-expansion. - DTSTART alone is worse — the provider then recomputes lastDate as if the event were a single instance and collapses the series to its first occurrence. DTSTART + DURATION + RRULE + zone together re-expand it correctly. This path is reached in normal use: Calendula's own contact special-date calendars are local and hold all-day yearly series, so deleting one birthday occurrence went through it. All-day series take the VALUE=DATE EXDATE form. Adds pure buildOccurrenceExdateValues + JVM tests (timed, append, duplicate fold, all-day). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Calendula
A modern Material 3 Expressive calendar for Android.
Reads, writes, and reminds — on top of the system calendar, with zero network access.
Calendula is named after the flower whose name — like the word calendar —
comes from the Latin kalendae, the first day of the month. It lives
entirely on top of Android's CalendarContract: any calendar synced to your
device (CalDAV via DAVx5, Google, local, WebCal subscriptions, …) simply
appears, and everything you create or edit syncs back the same way. No own
database, no sync stack reinvented.
✨ Features
Calendar
- Month, week, and day views with a one-tap view switcher
- Full event details — attendees and their responses, reminders, recurrence (humanized), availability, visibility, foreign time zones
- Per-calendar visibility toggle, grouped by account
Editing
- Create, edit, and delete events — including recurring events with scoped writes: only this event, this and all following, or the whole series
- Recurrence picker with one-tap presets and custom rules (interval, weekday toggles, end conditions); rules it can't express are preserved verbatim
- Conflict-safe saves: if an event changed elsewhere while you were editing, Calendula asks instead of silently overwriting
- Read-only calendars (WebCal, birthdays) are detected and respected
Reminders
- Event reminders delivered by Calendula itself as notifications — essential when it's your only calendar app, since Android delegates reminder delivery to calendar apps
- Tap a reminder to land on the event
Design & privacy
- Real Material 3 Expressive throughout — dynamic color (Android 12+), expressive motion and shapes, light/dark theme
- German and English UI, per-app language setting — and open to community translations
- Zero telemetry, zero analytics, no internet permission — your data never leaves the device
📦 Install
F-Droid (recommended)
Calendula is on the official F-Droid repository — just search for Calendula in any F-Droid client, or install it from f-droid.org.
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:
-
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=C2C0640402BF458FC0ED957AF0B37AA4C14022E72F89CE90B5965B458CF73425Repo:
https://apps.dev.jeanlucmakiola.de/dev/fdroid/repo· fingerprint (SHA-256):C2C0 6404 02BF 458F C0ED 957A F0B3 7AA4 C140 22E7 2F89 CE90 B596 5B45 8CF7 3425 -
Refresh, search for Calendula, install.
Both channels share the same signing key, so you can switch between them without reinstalling. Or build from source — see below.
📚 Documentation
- Building from source — requirements and Gradle tasks
- Architecture — the layered design and key pipelines
- Roadmap — what's shipped and what's next
🌍 Translations
Calendula ships in German and English, and you're warmly invited to add your language. Translations are managed on a self-hosted Weblate:
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
MIT — Jean-Luc Makiola, 2026