code: def forecast_until(self, timestamp, tsformat=None):
          
          if tsformat is not None:
              timestamp = TimeSeries.convert_timestamp_to_epoch(timestamp, tsformat)
  
          self._forecastUntil = timestamp
docs: Sets the forecasting goal (timestamp wise).
  
          This function enables the automatic determination of valuesToForecast.
  
          :param timestamp:    timestamp containing the end date of the forecast.
          :param string tsformat:    Format of the timestamp. This is used to convert the
              timestamp from UNIX epochs, if necessary. For valid examples
              take a look into the :py:func:`time.strptime` documentation.