FA-77098 / Calendar recurrence rules / Member archive

Daily BYHOUR/BYMINUTE time-of-day expansion: default minute · case 03

A 09:30 series with BYHOUR=9,17 fires on the hour.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

FREQ=DAILY. Each day produces the cartesian product of BYHOUR and BYMINUTE in chronological order; a missing BYHOUR defaults to the dtstart hour and a missing BYMINUTE to the dtstart minute. Duplicates in either list are ignored. Times before dtstart are dropped. Return the first count ISO date-times.

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
no lists	`["2024-02-29T23:00", "2024-03-01T23:00", "2024-03-02T23:00"]`	`["2024-02-28T23:45", "2024-02-29T23:45", "2024-03-01T23:45"]`	Failed

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