RRULE Tester

Recurrence rules are how calendars encode “every 2nd Tuesday” or “last weekday of the month” (RFC 5545). Paste a rule — with or without a DTSTART line — and see exactly which dates it generates.

Rule

RRULE (a bare FREQ=… works too)

DTSTART (used when the rule has no DTSTART line)

Show

Examples:

Occurrences are computed in floating local time (no time-zone conversion), which is how most calendar apps treat recurring events. Supported: FREQ (SECONDLY excluded), INTERVAL, COUNT, UNTIL, BYDAY incl. ordinals, BYMONTH, BYMONTHDAY incl. negatives, BYHOUR, BYMINUTE, BYSETPOS, WKST. Not supported: BYWEEKNO, BYYEARDAY, BYSECOND, RDATE/EXDATE.