Icalendar
ICalendar is a widely-used data format for representing and exchanging calendaring and scheduling information independent of any particular calendar service or protocol.
Rrule
A rrule is used in the iCal format to specify rules for recurring events.
Others
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It s possible for icalendar software to make this a lot shorter with rrule but these calculations are hard and not everybody implements it from question ICal4j RDATE multiple entries in ics file |