It won’t take long to notice that when an order is placed on your store the time of the order is incorrect, unless you live in Paris France. In Prestashop v1.2, you can go to the Preferences tab and then change the timezone at the bottom. In v1.1, you must change a line near the top of config.inc.php from the following to whatever timezone you want.

date_default_timezone_set('Europe/Paris');

A list of the available timezones can be found here http://us2.php.net/manual/en/timezones.php