Doctrine\DBAL\Platforms\DB2Platform::getDateArithmeticIntervalExpression PHP Method

    protected function getDateArithmeticIntervalExpression($date, $operator, $interval, $unit)
    {
        switch ($unit) {
            case self::DATE_INTERVAL_UNIT_WEEK:
                $interval *= 7;
                $unit = self::DATE_INTERVAL_UNIT_DAY;
                break;
            case self::DATE_INTERVAL_UNIT_QUARTER:
                $interval *= 3;
                $unit = self::DATE_INTERVAL_UNIT_MONTH;
                break;
        }
        return $date . ' ' . $operator . ' ' . $interval . ' ' . $unit;
    }