Recurring events with timezone

Georg C. F. Greve greve at
Thu Oct 28 19:37:16 CEST 2010

Hi Tobias,

On Thursday 28 October 2010 18.47:24 Tobias König wrote:
> I'm not familiar with the recurrence rules of the kolab format, but with
> ICal one can specify quite sophisticated exceptions. So a german kolab
> client could split the above event into the two events: [...]
> The question is how complex these DST rules are in the various country and
> if kolab format supports to express them as exceptions.

Thank you for the explanation.

Considering that DST rules are ugly, this sounds fragile to me, to be honest.

> The other clients (not the creator) just add their local DST offset to get
> the local time. The time of the event is bound to the creators timezone,
> right?

Almost. A user should be able to set the time zone to which this event is 
sticky. That COULD be the user's time zone. It could be another.

> I'm not working on the calendaring part, so I can't really comment on what
> would fit best. But since we have a good timezone/date library, both
> conversions should be possible for us.

Alright. Do you think you could identify the right person working on Kontact 
to take a look at this and tell us whether they have a preference?

It would be annoying to agree on a solution and then hear back from the person 
working on this code in Kontact that this is the absolutely worst to 

Best regards,

Georg C. F. Greve
Chief Executive Officer

Kolab Systems AG
Zürich, Switzerland

e: greve at
t: +41 78 904 43 33

pgp: 86574ACA Georg C. F. Greve
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