[Kolab-devel] Possible bug in generated calendar invitations

[Steve Teti]

Hello,

I think there's a problem with invalid timezone information (VTIMEZONE) 
in event invitations - specifically with the TZOFFSETFROM and TZOFFSETTO 
for timezones with negative UTC offsets.  When I create a new calendar 
event, the VTIMEZONE data in the generated invitation looks like this:

BEGIN:VTIMEZONE
TZID:America/New_York
X-MICROSOFT-CDO-TZID:10
BEGIN:STANDARD
DTSTART:20141102T060000
TZOFFSETFROM:-400
TZOFFSETTO:-500
TZNAME:EST
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:20150308T070000
TZOFFSETFROM:-500
TZOFFSETTO:-400
TZNAME:EDT
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:20151101T060000
TZOFFSETFROM:-400
TZOFFSETTO:-500
TZNAME:EST
END:STANDARD
END:VTIMEZONE

Note specifically that the TZOFFSETFROM and TZOFFSETTO are formatted 
without a leading zero.  This problem does not exist for timezones with 
a positive UTC offset - it only manifests for those with a negative 
offset.  Some clients, such as Lightning and Outlook, seem to handle 
this OK.  Other clients (Gmail was the one I found the issue on) do not 
recognize the event invitation at all.  The validator at 
http://severinghaus.org/projects/icv/ throws an error stating "Invalid 
UTC offset [-400] - must be of the form: (+/-)HHMM[SS]".

I have attached a patch for libcalendaring that fixes this issue in my 
deployment.

Thanks,
Steve
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