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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?
data = json.loads(to_str(request.data))
    iam_client = aws_stack.connect_to_service('iam')
    sid = data.get('StatementId')
    policy = {
        'Version': IAM_POLICY_VERSION,
        'Id': 'LambdaFuncAccess-%s' % sid,
        'Statement': [{
            'Sid': sid,
            'Effect': 'Allow',
            
            
            'Action': data.get('Action'),
            'Resource': func_arn(function)
        }]