Calculation of next working day date

WorkingDaysCalculator.php

class WorkingDaysCalculator
{
    const SUNDAY = 0;
    const SATURDAY = 6;   

    /**
     * Get next working day date
     *
     * @param \DateTime $baseDate - default now
     * @param int $additionalWorkingDays - default 0
     *
     * @return \DateTime
     */
    public function calculateNextWorkingDay(DateTime $baseDate, $additionalWorkingDays = 0): DateTime
    {
        $date = clone $baseDate;

        if ((int)$date->format('w') === self::SUNDAY) {
            $date->add(new DateInterval('P1D'));
        }

        if ((int)$date->format('w') === self::SATURDAY) {
            $date->add(new DateInterval('P2D'));
        }

        for ($i = 0; $i < $additionalWorkingDays; $i++) {
            $date->add(new DateInterval('P1D'));
            if ((int)$date->format('w') === self::SUNDAY) {
                $date->add(new DateInterval('P1D'));
            }
            if ((int)$date->format('w') === self::SATURDAY) {
                $date->add(new DateInterval('P2D'));
            }
        }

        return $date;
    }
}