.ics Calendar Event off by one day

I have something strange going on: I have a .ics Calendar Event (see below).
What's weird is that if I set a date, the actual date it puts in the calendar is one day earlier. For the example below, I set it with a date of April 30, but when I open the file, it's got a date of April 29 :confused:

It's not that big of a deal (I can just set the date one day ahead), but I thought it was kind of strange...

Code:

---

BEGIN:VCALENDAR
VERSION:1.0
BEGIN:VEVENT
DTSTART:20090430
DTEND:20090430
SUMMARY:tet
LOCATION:test
DESCRIPTION:tet
PRIORITY:3
END:VEVENT
END:VCALENDAR

---

Might this be the issue?

Quote:

---

RFC 2445, section 4.8.2.2:

4.8.2.2 Date/Time End

Property Name: DTEND

Purpose: This property specifies the date and time that a calendar
component ends.

Value Type: The default value type is DATE-TIME. The value type can
be set to a DATE value type.

Property Parameters: Non-standard, value data type, time zone
identifier property parameters can be specified on this property.

Conformance: This property can be specified in "VEVENT" or
"VFREEBUSY" calendar components.

Description: Within the "VEVENT" calendar component, this property
defines the date and time by which the event ends. The value MUST be
later in time than the value of the "DTSTART" property.


According to the RFC, DTEND must be greater than DTSTART. Which would
seem to imply that in order to get "all day" behavior for a single VEVENT,
DTEND = DTSTART + 1, not DTEND = DTSTART as it's currently interpreted.

The behavior of "DTEND = DTSTART + 1" being one day in length is supported
by Google Calendar, Microsoft Outlook, and Mozilla SunBird at the least (I
have not yet tested other calendards).

All of the iCal remote calendars I looked at that used VALUE=DATE also had
DTEND as being DTSTART + 1 to signify a single day.

---

When I saw your post, I immediately thought "That's gotta be it!"

Until I changed the DTSTART to 04292009 and the DTEND to 04302009 to test, and now it's trying to populate the calendar with an event starting on 04/28/2009 and ending on 04/29/2009 - it's still off by 1 day! Now I'm determined to find out what's going on with this...

Try adding the time to the dates. e.g.

DTSTART;TZID=US/Pacific:20090430T150000
DTEND;TZID=US/Pacific:20090430T160000

Adding the time finally made it get the date right - thanks!