def _persist_dt(self, uuid, dt):
        self.delivery_tags[uuid] = dt
Get value from property to send to datastore.
dataset/ETHPy150Open niwinz/django-greenqueue/greenqueue/backends/rabbitmq.py/RabbitMQService._persist_dt--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/db/__init__.py/DateProperty.get_value_for_datastore