Calender entry Timezone problems (iCal)

[gero]

Hi,

I've added a link to a shared Calender in Zimbra (OpenSource version version 4.0.4) and if the Calendar in Zimbra shows all appointments 9 hours later than the actual time.
The ICS file is created by Apple iCal and Zimbra is running on the same machine as iCal.

I noticed that several people had similar problems. One of the suggestions was to include an additional '/' after the TZID=, but that did no help.

The timezone on my machine is set to CET:
macmini-gero:/tmp gero$ date
Tue Feb 6 13:35:13 CET 2007

An example of a Calender event in the ICS file that is not showing correct is:
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20070130T093000
SUMMARY:Confcall Fanny
UID:20CED457-8477-4D07-9D5F-F2C35186D115
DTSTAMP:20070203T190407Z
SEQUENCE:1
DURATION:PT30M
BEGIN:VALARM
ACTION:AUDIO
TRIGGER:-PT5M
X-WR-ALARMUID:3E4F557C-1633-48B6-A25E-0974A16953C8
ATTACH;VALUE=URI:
END:VALARM
END:VEVENT

Any ideas what the problem could be and how this can be resolved?

9 hours difference is exactly the time difference between CET (my timezone) and California (wheer Zimbra office is).... could there be someting hardcoded?

Regards,
Gero