diff --git a/mod/quiz/report/responses/responses_table.php b/mod/quiz/report/responses/responses_table.php
index 7ae766873e5..b1d49abf817 100644
--- a/mod/quiz/report/responses/responses_table.php
+++ b/mod/quiz/report/responses/responses_table.php
@@ -21,6 +21,7 @@ class quiz_report_responses_table extends table_sql {
     }
     function build_table(){
         if ($this->rawdata) {
+            $this->strtimeformat = str_replace(',', ' ', get_string('strftimedatetime'));
             parent::build_table();
         }
     }