BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//PIMUTILS.ORG//NONSGML khal / icalendar //EN
BEGIN:VEVENT
SUMMARY:This event is invalid but should still be supported by khal
DTSTART;VALUE=DATE:20071201
DTEND;VALUE=DATE:20071202
UID:invalidRRULEUNTIL
RRULE:FREQ=MONTHLY;UNTIL=20080202T000000Z
END:VEVENT
END:VCALENDAR