Thanks for the link:-)
THAT'S something I had expected to be linked to either on the maemo download page
http://maemo.org/downloads/product/OS2008/omweather/
or on the project home page...

But I still can't find an explanation why OMWeather doesn't show the correct date.

For my city (Hannover, Germany), it currently shows 'Montag 00 Januar' :-/
And yes, I have set the system date correctly;-)