Date settings ?

I have this massage all over my post- news on page and on the cutenews:

Strict Standards:date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CET/1.0/no DST' instead in /homepages/33/d341912531/htdocs/kejos/cutenews/inc/shows.inc.php on line 850

How do I mange time setting ( where ?) and how do I get out the massage appearing on every of my new and old posts.

Thank you people of the world !
M