diff --git a/src/Reports/ShopPeriodReport.php b/src/Reports/ShopPeriodReport.php
index b7e63771..c5e2dc5e 100644
--- a/src/Reports/ShopPeriodReport.php
+++ b/src/Reports/ShopPeriodReport.php
@@ -82,7 +82,9 @@ public function parameterFields()
         // When using silverware/calendar package, setting the date format breaks the admin interface.  Leave default
         // behavior as was, but allow the date format not to be set as a config override
         if ($this->config()->get('disable_set_date_format') != true) {
+            $start->setHTML5(false);
             $start->setDateFormat($dateformat);
+            $end->setHTML5(false);
             $end->setDateFormat($dateformat);
         }