diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/argument/Date.php b/core/modules/views/lib/Drupal/views/Plugin/views/argument/Date.php
index 9cb7464..56158ed 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/argument/Date.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/argument/Date.php
@@ -88,9 +88,9 @@ public static function create(ContainerInterface $container, array $configuratio
    */
   public function defaultArgumentForm(&$form, &$form_state) {
     parent::defaultArgumentForm($form, $form_state);
-    $form['default_argument_type']['#options'] += array('date' => t('Current date'));
-    $form['default_argument_type']['#options'] += array('node_created' => t("Current node's creation time"));
-    $form['default_argument_type']['#options'] += array('node_changed' => t("Current node's update time"));
+    $form['default_argument_type']['#options'] += array('date' => $this->t('Current date'));
+    $form['default_argument_type']['#options'] += array('node_created' => $this->t("Current node's creation time"));
+    $form['default_argument_type']['#options'] += array('node_changed' => $this->t("Current node's update time"));
   }
 
   /**
@@ -124,7 +124,7 @@ public function getDefaultArgument($raw = FALSE) {
    * {@inheritdoc}
    */
   public function getSortName() {
-    return t('Date', array(), array('context' => 'Sort order'));
+    return $this->t('Date', array(), array('context' => 'Sort order'));
   }
 
   /**