Last modified: 2010-05-15 15:38:12 UTC
On machine which clock is not in UTC, the name of the timezone in signatures is the name of timezone the machine's clock is in. Seems like this happens in 1.4 too
IIRC this is done on purpose; the timezone can be set in config for instance to give a more 'natural' localtime for localized wikis. (Such as European time for several of our European- language wikis.)