public class Date implements Comparable<Date>{
    int month;
    int day;
    int year;
    public Date(int m, int d, int y){
        this.month = m;
        this.day = d;
        this.year = y;
    }

    @Override
    public int compareTo(Date o) {
        int yDelta = this.year - o.year;
        int mDelta = this.month - o.month;
        int dDelta = this.day - o.day;
        return ((yDelta * 365) + (mDelta * 31) + dDelta);
    }
}