diff --git a/core/modules/system/system.admin.inc b/core/modules/system/system.admin.inc
index c3c2ce4..2a6fec5 100644
--- a/core/modules/system/system.admin.inc
+++ b/core/modules/system/system.admin.inc
@@ -2554,7 +2554,7 @@ function system_date_time_formats() {
         $row = array();
         $row[] = array('data' => $date_format_id);
         $row[] = array('data' => $format_info['name']);
-        $row[] = array('data' => format_date(REQUEST_TIME, $date_format_id));
+        $row[] = array('data' => check_plain(format_date(REQUEST_TIME, $date_format_id)));
 
         // Prepare Operational links.
         $links = array();