class DateUtils {

    public static int fromISOtoCalendarDayOfWeek(final DayOfWeek dow) {
        if (dow != null) {
            switch (dow.ordinal()) {
                case 0:
                    return Calendar.MONDAY;
                case 1:
                    return Calendar.TUESDAY;
                case 2:
                    return Calendar.WEDNESDAY;
                case 3:
                    return Calendar.THURSDAY;
                case 4:
                    return Calendar.FRIDAY;
                case 5:
                    return Calendar.SATURDAY;
                case 6:
                    return Calendar.SUNDAY;
            }
        }
        return -1;
    }

    private  DateUtils();

}