BEGIN:VCALENDAR
VERSION:2.0
PRODID:test
BEGIN:VEVENT
UID:test-rdate-period-start-duration
DESCRIPTION:event with rdate period start duration
DTSTART:20000101T000000Z
DURATION:PT1H
DTSTAMP:20000101T000000Z
RRULE:FREQ=WEEKLY
RDATE;VALUE=PERIOD:20000102T000000Z/PT2H
END:VEVENT
END:VCALENDAR