public static double deltaHours(int calUnit, int increments) {
        if (calUnit == Calendar.DATE) {
            return 24 * increments;
        } else if (calUnit == Calendar.HOUR) {
            return increments;
        } else if (calUnit == Calendar.MINUTE) {
            return increments / 60;
        } else if (calUnit == Calendar.SECOND) {
            return increments / 3600;
        }
        return -1;
    }