All-day items are date-only in iCalendar and are stored as UTC midnight of
their calendar date — the convention the tasks and calendar providers read
back (OpenTasks resolves them through DateTime.toAllDay(), which discards the
time and resolves the remaining date against UTC).
formatDate/formatDateTime/formatDateTimeCompact resolved every instant against
ZoneId.systemDefault(), so an all-day value rendered as the *previous* day for
anyone west of UTC: a task stored as 2026-07-20T00:00Z showed as 19 Jul in New
York. East of UTC it happened to land on the right day, which is why this went
unnoticed.
formatDate now takes an allDay flag (defaulting to false, so existing call
sites are unaffected) and all-day values resolve against UTC.
Callers must pass allDay at the call site — agendula and calendula both have
sites that need updating.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Centralises the calendar-week-number computation — ISO-8601
week-of-week-based-year (Monday-start, week 1 holds the first Thursday) —
that Calendula previously inlined identically in its Week and Month grid
headers. Names the scheme choice (there are several incompatible "week
number" definitions) and covers the year-boundary rollover cases with a
unit test.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Drops the year in the current year and drops the time when it carries no information (all-day items or a midnight time), so list rows show glanceable dates like "20 Jun" or "20 Jun · 14:30".
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Generic content-provider time bridge shared by the family: Long epoch millis
<-> kotlin.time.Instant. Extracted from Calendula for Phase 1 (Calendula as the
second core-time consumer). 3 unit tests; module suite now 5 green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
First module of floret-kit, the shared Material 3 Expressive design system +
plumbing for the Floret app family. core-time is a pure-Kotlin JVM library
(DayWindow local-day boundaries + locale/zone-aware Instant formatting),
extracted from Agendula. Standalone build + 2 unit tests green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
