FA-77055 / Calendar recurrence rules / Member archive

Window query for recurring instances with duration: window exit · case 05

An instance starting exactly at the exclusive window end is returned.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Instances start at dtstart + k*interval_hours for k < count and last duration_min minutes. A window [window_start, window_end) returns every instance whose half-open span [s, s+duration) overlaps it; a zero-duration instance is returned when window_start <= s < window_end. The query may skip ahead but COUNT is always counted from dtstart. Return ISO start times (minutes).

Why this case matters

Recurring calendar series are expanded into concrete instances for display, reminders and conflict checks.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: in-progress long meeting	`["2024-01-01T08:00", "2024-01-01T09:00", "2024-01-01T10:00", "2024-01-01T11:00", "2024-01-01T12:00"]`	`["2024-01-01T08:00", "2024-01-01T09:00", "2024-01-01T10:00", "2024-01-01T11:00"]`	Failed

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