A free (libre), open-source (GNU GPL) blogging and content-management system. WordPress is written in PHP, supports severeal operating-systems, and requires a MySQL database.
Notable WordPress sites include the U.S. Library of Congress, MSNBC, and The Rolling Stones.
date.timezone="Europe/Berlin" in php.ini oder date_default_timezone_set('Europe/Berlin'); in wp-config.php - falls variomedia das nicht sowieso schon erledigt...