日期求差代码

package com;

public class Date {

 public static int rn(int y,int m,int d)//闰年,在明天是几号里用到
 {
 int f=0;
 if(y%400==0||y%4==0&&y%100!=0)
 f=1;
 return f;
 
 }
 public static int  xt(int y1,int m1,int d1,int y2,int m2,int d2)//相同
 {
 int f=0;
 if(y1==y2&&m1==m2&&d1==d2)
 f=1;
 return f;
 }
 public static  int []  mt(int y,int m,int d)//明天
 {  
 
int []a=new int[3];
switch(m)
{
case 1:
case 3:
case 5:
case 7:
case 8:

case 10:
case 12:
{   
d++;
if(d>31)
{
m=m+1;
d=1;
if(m>12)
{
y=y+1;
m=1;
d=1;
}
}

break;
}
case 4:
case 6:
case 9:
case 11:
{  d++;
if(d>30)
{
m=m+1;
d=1;
if(m>12)
{
y=y+1;