def isoformat(self):
    import time
    epoch = float(self.text)/1000
    return time.strftime('%Y-%m-%dT%H:%M:%S.000Z', time.gmtime(epoch))
(string) Return the timestamp as a ISO 8601 formatted string,
dataset/ETHPy150Open CollabQ/CollabQ/vendor/gdata/exif/__init__.py/Time.isoformat