I've set the German wiki to consider the default timezone as Central European (Summer) Time. That is, if you _don't_ set a timezone offset (leave it blank) you see times in CEST. If you do set an offset, it's still measured against UTC, so there should be no nasty surprises.
The four-tilde signature-with-time also shows according to this site-wide default local time. (This can be set via $wgLocaltimezone in LocalSettings.php)
Note that this does not affect the places in recentchanges list where the date change is shown; this is a known bug that affects anyone with offset not set to server time.
Giskart wrote:
And there are also locations where the difference between UTC and local time is not clean houres but also 30 minutes. For French Polynesia http://www.wikipedia.org/wiki/French_Polynesia it is UTC - 9:30 Does the software support - 30 minutes ? I have no succes. Not that i am from "French Polynesia" but i like to know. -- giskart
Not yet, but I'll be sure and bang that in.
-- brion vibber (brion @ pobox.com)