BEGIN:VCALENDAR
  PRODID:-//some random cal software//EN
  VERSION:2.0
  BEGIN:VEVENT
  CREATED:20130102T120000Z
  LAST-MODIFIED:20130102T120000Z
  DTSTAMP:20130102T120000Z
  UID:f106ecdf-c716-43ef-9d94-4e6f19f2fcfb
  SUMMARY:a test cal file
  DTSTART;VALUE=DATE:20130101
  DTEND;VALUE=DATE:20130102
  END:VEVENT
  END:VCALENDAR