Represents a time period - either a single period or a repeating period.
An iCalendar (RFC 5545) event, which specifies the name, timing, duration and recurrence of this time period.
DTSTART:20190707T180000 DURATION:P2H RRULE:FREQ=WEEKLY;BYDAY=MO,WE,FR
RRULE fields are supported.
DTSTART must be in local (unzoned) time format. Note that while
END:VEVENT is not required in the request. The response will always