Calendar and the integrated Tasks Calendar offer Recurring event in Create.
It saves to canonical Tuturuuu Calendar. Daily, weekly, absolute monthly and yearly
rules support an interval and no end, an occurrence count, or an inclusive end
date. Choose a named time zone: local wall-clock times remain stable across DST.
Nonexistent spring-forward slots are skipped; repeated fall-back times use the
earlier instant. All-day end dates are exclusive midnight boundaries.
Generated occurrences open a dedicated editor. Only this occurrence,
Entire series, and This and following occurrences are explicit choices,
defaulting to this occurrence. Requests preserve its immutable original slot and
use the loaded series revision. Concurrent changes require an explicit reload.
Whole-series editing uses the original anchor; future count rules retain remaining
slots. Advanced relative-weekday patterns are preserved while editing details.
Virtual occurrences never use ordinary event CRUD or drag mutation APIs. Dragging
and resizing are disabled; use the scoped editor to move an occurrence. Native
ranges revalidate in the background, retaining same-actor data through transport,
throttling and temporary failures. Definitive access denial clears retained data.
Reads and writes use verified actor lifetimes and separate workspace cache keys.
Unchanged failed write intents reuse idempotency keys. Reopening or changing the
workspace/account resets form state.
Provider recurrence creation and scoped editing remain outside this native UI
until provider APIs support them. External calendar adapters retain their existing
behavior; the native Create dialog does not select a provider source.
Regression evidence: native-recurrence-model.test.ts covers DST, validation,
all-day boundaries, original identities, remaining counts and retry intent IDs;
native-recurrence-dialog.test.tsx covers forms, permission and reset behavior;
use-native-calendar-occurrences.test.tsx covers SWR and actor/permission fences;
use-calendar-readonly.test.tsx proves virtual mutations cannot reach ordinary
write APIs.
