Horde_Date::fromDays PHP Method

    public static function fromDays($days)
    {
        if (function_exists('jdtogregorian')) {
            list($month, $day, $year) = explode('/', jdtogregorian($days));
        } else {
            $days = intval($days);
            $days -= 1721119;
            $century = floor((4 * $days - 1) / 146097);
            $days = floor(4 * $days - 1 - 146097 * $century);
            $day = floor($days / 4);
            $year = floor((4 * $day + 3) / 1461);
            $day = floor(4 * $day + 3 - 1461 * $year);
            $day = floor(($day + 4) / 4);
            $month = floor((5 * $day - 3) / 153);
            $day = floor(5 * $day - 3 - 153 * $month);
            $day = floor(($day + 5) / 5);
            $year = $century * 100 + $year;
            if ($month < 10) {
                $month += 3;
            } else {
                $month -= 9;
                ++$year;
            }
        }
        return new Horde_Date($year, $month, $day);
    }