FA-76987 / Calendar recurrence rules / Member archive

Merging RRULE instances with RDATE and EXDATE: dedupe merge · case 02

An RDATE equal to a rule instance appears twice.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

All-day series: the rule yields exactly count instances dtstart + k*interval days (COUNT counts rule instances before exclusions; RDATEs never consume COUNT). The instance set is rule plus RDATE minus EXDATE; EXDATE also removes RDATEs. EXDATE values may carry a time part (YYYY-MM-DDTHH:MM:SS) and then exclude their calendar date. Return the unique dates sorted ascending.

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
rdate equal to rule date	`["2024-01-01", "2024-01-08", "2024-01-08", "2024-01-15"]`	`["2024-01-01", "2024-01-08", "2024-01-15"]`	Failed

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