diff --git a/classes/element_helper.php b/classes/element_helper.php
index e8920471..125b1eb0 100644
--- a/classes/element_helper.php
+++ b/classes/element_helper.php
@@ -762,7 +762,7 @@ public static function get_date_format_string(int $date, string $dateformat): st
                     break;
                 case 5:
                     // ISO 8601 date format (YYYY-MM-DD).
-                    $certificatedate = userdate($date, '%Y-%m-%d');
+                    $certificatedate = userdate($date, '%Y-%m-%d', 99, false, false);
                     break;
                 default:
                     $certificatedate = userdate($date, get_string('strftimedate', 'langconfig'));