Single day all day appointments in .ics files

Question

I\'m creating an ics file using ASP.NET for importing holiday into Outlook 2007 and trying to set the all-day-event flag. This works fine on multi-day holidays, but for sing

Answer 1

Leaving this here for anyone else Googling.. I had trouble with the same, mix of all day events and half days particularly in Google Calendar.

My problem was related to how the ICS file was being force downloaded. sounds silly, but a header that forced download, prevented Google calendar from properly parsing all day events. Streaming to the browser had better results. Sample output here. (use VALUE=DATE) for single all day events.

BEGIN:VEVENT
UID:1248
DTSTART;VALUE=DATE:20151218
DTEND;VALUE=DATE:20151219
DTSTAMP:20151218T080000Z
CREATED:20151212T200409Z
DESCRIPTION:examplea
LAST-MODIFIED:20151218T080000Z
LOCATION:
SUMMARY:example summary
SEQUENCE:0
STATUS:CONFIRMED
TRANSP:OPAQUE
END:VEVENT
BEGIN:VEVENT
UID:1249
DTSTART;VALUE=DATE:20151217
DTEND;VALUE=DATE:20151218
DTSTAMP:20151217T080000Z
CREATED:20151212T200409Z
DESCRIPTION:example1
LAST-MODIFIED:20151217T080000Z
LOCATION:
SUMMARY:Example
SEQUENCE:0
STATUS:CONFIRMED
TRANSP:OPAQUE
END:VEVENT