Hello Magnus
Sharing the solution you've found by yourself would be good thing to do, when you open a topic, since the same info might be useful to anyone else searching for it.
For the others: time zone settings are 'hidden' in the Locale preferences, and can be accessed through a tab on the top right of the program window. Select the option below (sync to UTC) if you're using daylight/summer time in your country (or, at least, this fixed time in Italy with AmiTimeKeeper, a NTP client for AROS).