public function isDayAHoliday(DateTime $dateTime, $region)
    {
        $holidayList = $this->holidayCalculator->calculateHolidaysForYear((int) $dateTime->format('Y'), $region, $dateTime->getTimezone());
        $filteredHolidays = (new IncludeTimespanFilter())->filter($holidayList, [
            IncludeTimespanFilter::PARAM_FIRST_DAY => $dateTime,
            IncludeTimespanFilter::PARAM_LAST_DAY => $dateTime,
        ]);

        return count($filteredHolidays) > 0;
    }