diff --git a/flask_admin/form/fields.py b/flask_admin/form/fields.py
index b31cc38d3..f1b0c71c7 100644
--- a/flask_admin/form/fields.py
+++ b/flask_admin/form/fields.py
@@ -36,9 +36,8 @@ def __init__(self, label=None, validators=None, format=None, **kwargs):
             :param kwargs:
                 Any additional parameters
         """
-        super(DateTimeField, self).__init__(label, validators, **kwargs)
-
-        self.format = format or '%Y-%m-%d %H:%M:%S'
+        super(DateTimeField, self).__init__(
+            label, validators, format or '%Y-%m-%d %H:%M:%S', **kwargs)
 
 
 class TimeField(fields.Field):