Welcome to X-Cart! Please start by reading the forum guidelines (
http://forum.x-cart.com/viewtopic.php?t=6489), and posting your X-Cart version in your signature (click the User CP link at the top of the forum). You can find your version by clicking on the 'Summary' link in your admin area.
You'll find Smarty date information here:
http://smarty.php.net/manual/en/language.modifier.date.format.php