dev #137875 Admin PNB : fix sort attributes on several columns

library/Class/TableDescription/PNBUsages.php

@@ -34,7 +34,8 @@ class Class_TableDescription_PNBUsages extends Class_TableDescription {
                    'sort_attribute' => 'license_expiration'])
       ->addColumn($this->_('Date de commande'),
                   ['callback' => function($usage) {
-                                   return date('d/m/Y', strtotime($usage->getOrderDate()));
+                                   return (new DateTime($usage->getOrderDate()))
+                                     ->format('d/m/Y');
                                   },
                    'sort_attribute' => 'order_date'])
       ->_addExtraColumns();