Revert "Fix for coupon expiration date validation"

This reverts commit 3dc4dc7

Author: Schrank

src/app/code/community/Hackathon/PromoCodeMessages/Model/Validator.php

@@ -163,7 +163,7 @@ protected function _validateGeneral($rule, $coupon)
 
         // check to date
         if ($rule->getToDate()) {
-            $toDate = new Zend_Date($rule->getToDate() . ' 23:59:59', Varien_Date::DATE_INTERNAL_FORMAT);
+            $toDate = new Zend_Date($rule->getToDate(), Varien_Date::DATE_INTERNAL_FORMAT);
             if ($now->isLater($toDate, Zend_Date::DATE_MEDIUM)) {
                 Mage::throwException($this->_formatMessage(
                     'Your coupon is no longer valid. It expired on %s.',