[Ietf-calsify] Re: DURATION and PERIOD - proposal

[Reinhold Kainhofer]

Am Freitag, 15. April 2005 20:55 schrieb Doug Royer:
> Which is why I showed converting it back to the users local time zone.
>
> And it matches what the user expected.
>
> Show an example that fails when you do the conversion to UTC, then
> the duration math, then the conversion back to the TZID.

Take an event in CET (DST starts on March 27, 2005) that starts at 01:30 CET 
on March 27 and lasts one day. The user expects this to end at 01:30 CEST on 
March 28.

Now do the math in UTC. The event starts at 00:30 UTC on March 27 and so ends 
at 00:30 UTC on March 28. That time, however, is 02:30 in the user's new time 
zone. So in this option, the event ends at 02:30 CEST on March 28, while the 
user expects it to end at 01:30.

Reinhold

-- 
------------------------------------------------------------------
Reinhold Kainhofer, Vienna, 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 / KPilot maintainer
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