          'abc': ['Date has wrong format. Use one of these formats instead: YYYY[-MM[-DD]]'],
          '2001-99-99': ['Date has wrong format. Use one of these formats instead: YYYY[-MM[-DD]]'],
          datetime.datetime(2001, 1, 1, 12, 00): ['Expected a date but got a datetime.'],
      }
      outputs = {}
      field = fields.DateField()
  
  
  class TestCustomInputFormatDateField(FieldValues):
      """
 
</s> remove     outputs = {}
 </s> add     outputs = {
        datetime.datetime(2001, 1, 1, 13, 00): '2001-01-01T13:00:00',
        datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()): '2001-01-01T13:00:00Z',
    } </s> remove     def __init__(self, format=None, input_formats=None, *args, **kwargs):
        self.format = format if format is not None else self.format
 </s> add     def __init__(self, format=empty, input_formats=None, *args, **kwargs):
        self.format = format if format is not empty else self.format </s> remove     def __init__(self, format=None, input_formats=None, *args, **kwargs):
        self.format = format if format is not None else self.format
 </s> add     def __init__(self, format=empty, input_formats=None, *args, **kwargs):
        self.format = format if format is not empty else self.format </s> remove     def __init__(self, format=None, input_formats=None, default_timezone=None, *args, **kwargs):
        self.format = format if format is not None else self.format
 </s> add     def __init__(self, format=empty, input_formats=None, default_timezone=None, *args, **kwargs):
        self.format = format if format is not empty else self.format
    outputs = {
        datetime.date(2001, 1, 1): '2001-01-01',
    }
          'abc': ['Date has wrong format. Use one of these formats instead: YYYY[-MM[-DD]]'],
          '2001-99-99': ['Date has wrong format. Use one of these formats instead: YYYY[-MM[-DD]]'],
          datetime.datetime(2001, 1, 1, 12, 00): ['Expected a date but got a datetime.'],
      }
    outputs = {
        datetime.date(2001, 1, 1): '2001-01-01',
    }
      field = fields.DateField()
  
  
  class TestCustomInputFormatDateField(FieldValues):
      """
keep keep keep keep replace keep keep keep keep keep
 Support format=None for date/time fields 
tests/test_fields.py