http://bugzilla.wikipedia.org/show_bug.cgi?id=505 See also http://meta.wikimedia.org/wiki/Automatic_timezone_selection - for comments
In four weeks, most of the US states and also European countries will change to daylight saving time ("Sommerzeit") --> timezone offset of many users need to be adapted individually.
What I proposed within this enhancement report was, to switch timezones automatically according to the affected countries (for users who have opted-in such a new method). T.
wikitech-l@lists.wikimedia.org