code: def epoch_to_log_line_timestamp(epoch_time, time_zone=None):
      
      s, ms = divmod(epoch_time, 1000)
      d = datetime.datetime.fromtimestamp(s, tz=time_zone)
      return d.strftime('%m-%d %H:%M:%S.') + str(ms)
docs: Converts an epoch timestamp in ms to log line timestamp format, which
      is readible for humans.
  
      Args:
          epoch_time: integer, an epoch timestamp in ms.
          time_zone: instance of tzinfo, time zone information.
              Using pytz rather than python 3.2 time_zone implementation for
              python 2 compatibility reasons.
  
      Returns:
          A string that is the corresponding timestamp in log line timestamp
          format.