private static boolean isEaster(Calendar calendar) {
        Calendar easterFirst = getEasterFirst(calendar);
        return (calendar.get(Calendar.MONTH) == easterFirst.get(Calendar.MONTH)
                && (calendar.get(Calendar.DAY_OF_MONTH) == easterFirst.get(Calendar.DAY_OF_MONTH)
                || calendar.get(Calendar.DAY_OF_MONTH) == getEasterSecond(calendar).get(Calendar.DAY_OF_MONTH)));
    }