code: def started(self):
          
          statistics = self._properties.get("statistics")
          if statistics is not None:
              millis = statistics.get("startTime")
              if millis is not None:
                  return _helpers._datetime_from_microseconds(millis * 1000.0)
docs: Datetime at which the job was started.
  
          :rtype: ``datetime.datetime``, or ``NoneType``
          :returns: the start time (None until set from the server).