def METHOD_NAME(self):
    date_field = factories.FieldFactory(
        input_type=submissions_models.Field.INPUT_TYPE_DATE, name="datum"
    )
    today = date.today()
    form = self.submission.forms.first()
    date_field.forms.set([form])
    data = {
        f"fields-{form.pk}_{date_field.pk}": today.strftime(
            settings.DATE_INPUT_FORMAT
        )
    }
    self.client.post(
        reverse(
            "submissions:submission_fields",
            kwargs={"submission_id": self.submission.pk},
        ),
        data=data,
    )
    field_val = self.submission.get_fields_values().get(field__name="datum")
    self.assertEqual(
        field_val.value,
        {"val": today.isoformat()},
    )
    self.assertEqual(
        field_val.field.input_type,
        submissions_models.Field.INPUT_TYPE_DATE,
    )