RRULE is the recurrence rule of the iCal standard (RFC 5545) and defines recurring calendar events machine-readably.
An RRULE describes how an event repeats – e.g. FREQ=WEEKLY;BYDAY=TU for every Tuesday. It is part of the iCal format and supported by Google Calendar, Apple Calendar, Outlook, and any other iCal client. Even complex patterns like "every first Monday of the month" are possible.
Rehearsal planning in giganizr uses RRULE rules for series – with a visual editor covering the standard patterns and staying iCal-compliant.
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