public function setHolidaysInMonth(\DateTime $lngDate, $inclCatholicEaster = false)
    {
        $holidaysInGivenYear = $this->setHolidays($lngDate, $inclCatholicEaster);
        $thisMonthDayArray   = $this->setMonthAllDaysIntoArray($lngDate);
        $holidays            = 0;
        foreach ($thisMonthDayArray as $value) {
            if (in_array($value, $holidaysInGivenYear)) {
                $holidays += 1;
            }
        }
        return $holidays;
    }