iCal does not appear to import Z time format.

I attempted to import some iCal entries generated by a version of the PHP calendar program available on SourceForge. Unfortunately, we're running the 6.14 core, so I was forced to use the 6x.x-1.9-beta2 FeedAPI, so that might be the source of the problem, but it really looks like an issue with iCal. Anyway, I successfully imported the calendar events and everything looked OK except for the times, which were 6 or 5 hours off depending on the date. I do have my timezone set correctly, although I don't believe that should have been a factor.

Here is an example iCal entry:

BEGIN:VEVENT
UID:20091028T173553Z-2000073-15272
SUMMARY: ShadowCaster's most excellent party
DESCRIPTION: Come ready to party
CLASS:PUBLIC
ATTENDEE;ROLE=OWNER;STATUS=CONFIRMED:Default Administrator
ATTENDEE;ROLE=ATTENDEE;STATUS=CONFIRMED: <>
DTSTART:20090524T180000Z
DTSTAMP:20091028T173553Z
DTEND:20090524T213000Z
END:VEVENT

This event occurs from 1:00 PM to 4:30 PM central daylight time. I believe that the times in this entry are correct for Zulu time. However, this is the row that is placed in the database:

vid=280, nid=280, delta=0, field_datetime_value 2009-05-24 23:00:00, field_datetime_value2=2009-05-25 02:30:00

When I look at the calendar entry for this date, I see that the event has a start time of 2009/05/24 06:00PM and an ending time of 2009/05/24 21:30:00.

After I adjust the time of the calendar event by hand, I see in the database:

vid=280, nid=280, delta=0, field_datetime_value 2009-05-24 18:00:00, field_datetime_value2=2009-05-24 21:30:00

Which is what I expected.

Again, I almost raised this against the beta FeedAPI, but the iCal parser seems like it is most likely the culprit.