题目6 日期差值

import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;

public class Main{
    public static void main(String[]args){
        Date t=new Date();
        t.year=0;
        t.month=1;
        t.day=1;
        int count=0;
        while(t.year!=5001){
            buf[t.year][t.month][t.day]=count;
            t.nextDate();
            count++;
        }
        
        Scanner in=new Scanner(System.in);
        while(in.hasNext()){
            String day=in.nextLine();
            String y=day.substring(0, 4);
            int y_=Integer.valueOf(y);
            String m=day.substring(4, 6);
            int m_=Integer.valueOf(m);
            String d=day.substring(6, 8);
            int d_=Integer.valueOf(d);
            int x1=buf[y_][m_][d_];
             day=in.nextLine();
             y=day.substring(0, 4);
             y_=Integer.valueOf(y);
             m=day.substring(4, 6);
             m_=Integer.valueOf(m);
             d=day.substring(6, 8);
             d_=Integer.valueOf(d);
             int x2=buf[y_][m_][d_];
             System.out.println(Math.abs(x1-x2)+1);
        }
     }
    private static int isYeap(int x){
        if(x%4==0&&x%100!=0||x%400==0) return 1;
        else return 0;
    }
    private static int[][]dayOfMonth={
            {0,0},
            {31,31},
            {28,29},
            {31,31},
            {30,30},
            {31,31},
            {30,30},
            {31,31},
            {31,31},
            {30,30},
            {31,31},
            {30,30},
            {31,31}
    };
    private static class Date{
        int year;
        int month;
        int day;
        void nextDate(){
            day++;
            if(day>dayOfMonth[month][isYeap(year)]){
                day=1;
                month++;
            }
            if(month>12){
                month=1;
                year++;
            }
        }
    }
    private static int[][][]buf=new int[5001][13][32];
}