public function getInsertDateUntil(\MUtil_Date $from)
    {
        return Period::applyPeriod(
                $from,
                $this->_gemsSurvey['gsu_valid_for_unit'],
                $this->_gemsSurvey['gsu_valid_for_length']
                );
    }
public function getInsertDateUntil(\MUtil_Date $from)
    {
        return Period::applyPeriod(
                $from,
                $this->_gemsSurvey['gsu_valid_for_unit'],
                $this->_gemsSurvey['gsu_valid_for_length']
                );
    }
public function getInsertDateUntil ( \ MUtil_Date $ from ) { return Period :: applyPeriod ( $ from , $ this -> _gemsSurvey [ 'gsu_valid_for_unit' ] , $ this -> _gemsSurvey [ 'gsu_valid_for_length' ] ) ; }
Calculate the until date for single survey insertion

@param \MUtil_Date $from
@return \MUtil_Date
Calculate the until date for single survey insertion