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Under utils/common.py, 

TIMESTAMP_FORMAT_MILLIS = '%Y-%m-%dT%H:%M:%S.%fZ'

The %f produces time with microseconds, for example: 2020-03-18T19:43:18.115783Z.


However, when interacting the AWS s3 and sns apis, I receive DateTimes like this:

2020-03-02T22:32:13.240Z
i.e. milliseconds. 

This seems like a simple change to the utils. TIMESTAMP_FORMAT_MILLIS is named as if it should be millis as well. This is seems like a simple change. Is there a reason it should be microseconds?
self.subscriber['RawMessageDelivery'] = 'true'
        action = {
            'Message': ['msg']
        }
        result = sns_listener.create_sns_message_body(self.subscriber, action)
        self.assertEqual(result, 'msg')
    def test_create_sns_message_body(self):
        action = {
            'Message': ['msg']
        }
        result_str = sns_listener.create_sns_message_body(self.subscriber, action)
        result = json.loads(result_str)
        try:
            uuid.UUID(result.pop('MessageId'))
        except KeyError:
            assert False, 'MessageId missing in SNS response message body'