Fixed: date pickers for the AdminOrder, AdminSpecificPriceRul, AdminInvoices, AdminCreditSlip, AdminHotelFeaturePriceSettings and filters

controllers/admin/AdminSpecificPriceRuleController.php

@@ -365,6 +365,12 @@ class AdminSpecificPriceRuleControllerCore extends AdminController
     public function postProcess()
     {
         Tools::clearSmartyCache();
+        if (Tools::isSubmit('submitAdd'.$this->table)) {
+            if (strtotime(Tools::getValue('from')) > strtotime(Tools::getValue('to'))) {
+                $this->errors[] = Tools::displayError('The price rule cannot end before it begins.');
+            }
+        }
+
         return parent::postProcess();
     }
 }