public static function weekdays($num = 1): array
    {
        $days = [];
        $day = self::parse(Date('Y-m-d'));
        while (count($days) < $num) {
            if (!$day->isWeekend()) {
                $days[] = clone $day;
            }
            $day->addWeekday();
        }
        return $days;
    }