PRODID:-//Example Calendar//NONSGML v1.0//EN\r
BEGIN:VEVENT\r
UID:2013-06-30@geohash.invalid\r
-DTSTAMP:2013-06-30T00:00:00Z\r
+DTSTAMP:20130630T000000Z\r
DTSTART;VALUE=DATE:20130630\r
DTEND;VALUE=DATE:20130701\r
SUMMARY:XKCD geohashing\, Boston graticule\r