If I look at the headers of the message I'm replying to, I see this:
Date: Tue, 27 Apr 2010 22:23:39 +0300
Helmut, your local clock seems to be correct, but your timezone settings  
is not. The +0300 at the end of your header indicates you are set to  
UTC+2 with summer time (or UTC+3), but it should be set to UTC+1 with  
summer time.
That timezone is used by mailers to adjust the date displayed for  
messages. Normally you should see something like 20:53 for this message,  
since it is my local time and we are in the same timezone.