Bug ID 91318
Summary Exchange can send TimeZone with zero StandardDate
Product SyncEvolution
Version unspecified
Hardware Other
OS All
Status NEW
Severity normal
Priority medium
Component ActiveSync
Assignee syncevolution-issues@syncevolution.org
Reporter g+syncevolution@cobb.uk.net
CC syncevolution-issues@syncevolution.org

Under some circumstances (not known -- may be to do with updates to existing
events but only seems to occur for me with some specific events imported from
outside Outlook), Exchange sends a <TimeZone> which is mostly 0.

The TZOFFSETFROM and TZOFFSETTO seem to come out right, but the DTSTART is all
zero (invalid).  This results in an invalid VTIMEZONE being generated and
passed to syncevolution.

Although I don't know what causes Exchange to send this, and it could be argued
that the message is invalid because the SYSTEMTIME cannot be all zero, we
apparently have to handle this case.  It looks like what Exchange is trying to
do is to specify a timezone (+0100 in my case) for the event without knowing
the real timezone for the event. I suggest that if the starting date-time in
the timezone sent from Exchange is zero, that we set it to an arbitrary date in
the past.  I suggest 1970-01-01, for little good reason.

I plan to investigate this further, and create a fix, but it may not be
immediate as my build/test environment is not up to date.

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