diff --git a/core/modules/locale/locale.datepicker.js b/core/modules/locale/locale.datepicker.js
index 55edf37..b7baa96 100644
--- a/core/modules/locale/locale.datepicker.js
+++ b/core/modules/locale/locale.datepicker.js
@@ -75,7 +75,6 @@ Drupal.behaviors.localeDatepicker = {
         Drupal.t('Fr'),
         Drupal.t('Sa')
       ],
-      dateFormat: Drupal.t('mm/dd/yy'),
       firstDay: 0,
       isRTL: 0
     }, Drupal.settings.jquery.ui.datepicker);