wheezy localtime - timezone problem

[AWIDON <enter@awidon.fi>]

Hello ML-Members.

I am new with Skolelinux and I am facing some challenges to get it running.
Using "debian-edu~7.0+edu0" on "tjener" and workstation.

tjener displays an timezone error.

error: ./timezone: /etc/localtime is not equal to (posix/Europe/Berlin), 
/etc/timezone is 'Europe/Helsinki'

As the entry in timezone is the correct one I need to modify the entry in 
localtime. How to do so, as the /etc/localtime file shows me some 
"Buchstabensalat" (letter-salad).

Thank you and summery greetings from Finland

Siegfried