@Override
	public int compareTo(Interval other) {
		int compare = Integer.compare(Integer.parseInt(getDay()), Integer.parseInt(other.getDay()));
		//if (day.getDay() < other.getDay())
        if (compare != 0) return compare;
		compare = startTime.compareTo(other.startTime);
		if (compare != 0) return compare;
        return Integer.compare(length, other.length);
	}