$date="2012-7-18 14:00:00";
        $change= Mage::getModel('core/date')->gmtDate("Y-m-d H:i:s", $date);
        Zend_Debug::dump($change);
        Zend_Debug::dump(Mage::getModel('core/date')->date("Y-m-d H:i:s", $change));
        die();