[Kde-pim] About KOrganizer's timezone setting

[Reinhold Kainhofer]

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Hello Bruno!

Am Donnerstag, 26. Juli 2007 schrieb Bruno Virlet:
> Following a bug report about the KOrganizer settings timezone being
> different from the system one and not being updated together, 

Yeah, endless story...

> The idea is as follows :
> - The calendar displays local times by default
> - When you add an event, you add it by default with local times but you
> have the ability to change to another timezone if prefered.
> - You can obviously change an event timezone.

Yes, that's extremely important, as recurrences depend on the TZ. E.g. an 
event every monday at 8 am in Vienna is an event every sunday at 11pm in 
LA... Some recurrences can only be expressed in one timezone, but not in 
another. For example, every first sunday of the month at 8am in Vienna. At 
that time in LA there is still the previous day, which might or might not be 
the first sunday of that month (if monday is the first day of the month). 

> - You can possibly change the display timezone of the calendar
> - Changing the display timezone doesn't change any event info, it only
> change the position of the events to match the choosen timezone.

That's exactly the way it is supposed to be. 

A little bit on history to explain the current mess:
In 3.5 and before we used QDateTimes that did not have a timezone attached, so 
all times were converted from UTC to the display timezone with no possibility 
to change the timezone of an event. Even worse, KOrganizer did not have a 
setting to use the system timezone (it imported the system time zone when an 
empty TZ setting was encountered, though. Subsequent changes to the system TZ 
went undetected, however.)

Cheers,
Reinhold

- -- 
- ------------------------------------------------------------------
Reinhold Kainhofer, Vienna University of Technology, Austria
email: reinhold at kainhofer.com, http://reinhold.kainhofer.com/
 * Financial and Actuarial Mathematics, TU Wien, http://www.fam.tuwien.ac.at/
 * K Desktop Environment, http://www.kde.org, KOrganizer maintainer
 * Chorvereinigung "Jung-Wien", http://www.jung-wien.at/
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