Morilog\Jalali\jDateTime::j2d PHP Method

    public static function j2d($jy, $jm, $jd)
    {
        $jCal = self::jalaliCal($jy);
        return self::g2d($jCal['gy'], 3, $jCal['march']) + ($jm - 1) * 31 - self::div($jm, 7) * ($jm - 7) + $jd - 1;
    }