added missing import

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@2423 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/FormulatorPatch.py

@@ -641,7 +641,7 @@ class PatchedDateTimeWidget(DateTimeWidget):
         
 DateTimeField.widget = PatchedDateTimeWidget()
 
-from Products.Formulator.Validator import DateTimeValidator, ValidationError
+from Products.Formulator.Validator import DateTimeValidator, ValidationError, DateTime
 
 class PatchedDateTimeValidator(DateTimeValidator):
     """