code: def convert_from_gps_time(gps_time, gps_week=None):
      
  
      converted_gps_time = None
      gps_timestamp = float(gps_time)
  
      if gps_week != None:
  
          # image date
          converted_gps_time = GPS_START + datetime.timedelta(seconds=int(gps_week) *
                                                              SECS_IN_WEEK + gps_timestamp)
  
      else:
          # TAI scale with 1970-01-01 00:00:10 (TAI) epoch
          os.environ['TZ'] = 'right/UTC'
  
          # by definition
          gps_time_as_gps = GPS_START + \
              datetime.timedelta(seconds=gps_timestamp)
  
          # constant offset
          gps_time_as_tai = gps_time_as_gps + \
              datetime.timedelta(seconds=19)
          tai_epoch_as_tai = datetime.datetime(1970, 1, 1, 0, 0, 10)
  
          # by definition
          tai_timestamp = (gps_time_as_tai - tai_epoch_as_tai).total_seconds()
  
          converted_gps_time = (
              datetime.datetime.utcfromtimestamp(tai_timestamp))
  
      # "right" timezone is in effect
      return converted_gps_time
docs: Convert gps time in ticks to standard time.