diff --git a/src/View/Widget/DateTimeWidget.php b/src/View/Widget/DateTimeWidget.php
index c2fcca3b..26ab7c72 100644
--- a/src/View/Widget/DateTimeWidget.php
+++ b/src/View/Widget/DateTimeWidget.php
@@ -61,7 +61,7 @@ public function render(array $data, ContextInterface $context)
             $val = $val->format($type === 'date' ? 'Y-m-d' : 'Y-m-d H:i:s');
         }
 
-        if ($format !== null) {
+        if ($format === null) {
             if ($type === 'date') {
                 $format = 'L';
             } elseif ($type === 'time') {