public static boolean isHoliday(Calendar calendar) {
        return (isEaster(calendar)
                || isChristmasSecond(calendar)
                || isFifthOfMay(calendar)
                || isAscensionDay(calendar)
                || isPentecostFirst(calendar)
                || isPentecostSecond(calendar)
                || isGoodFriday(calendar)
                || isQueensDay(calendar));
    }