def make_value_from_datastore(self, value):
    if value is not None:
      assert isinstance(value, datetime.datetime)
      value = value.date()
    return value
When receiving a informational response, the appropriate event is
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/db/__init__.py/DateProperty.make_value_from_datastore--crossover with--dataset/ETHPy150Open python-hyper/hyper-h2/test/test_informational_responses.py/TestReceivingInformationalResponses.test_single_informational_response