Java 计算两个日期的时间差

package sixth;

import java.util.Scanner;

public class Time {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in = new Scanner(System.in);
		String str1 = in.nextLine();
		String str2 = in.nextLine();
		int sYear,sMonth,sDay,eYear,eMonth,eDay;
		String []Str1 = str1.split(" ");
		String []Str2 = str2.split(" ");//split用于对字符串的分隔，在空格处对字符串进行分解
		//!!!!split(" ")用法的两个双引号中间必须使用空格，否则程序会报错
		int []num1 = new int[Str1.length];
		int []num2 = new int[Str2.length];
		for(int index = 0;index < Str1.length;index ++) {
			num1[index] = Integer.parseInt(Str1[index],10);
			num2[index] = Integer.parseInt(Str2[index],10);
			
		}
		sYear = num1[0];
		sMonth = num1[1];
		sDay = num1[2];
		eYear = num2[0];
		eMonth = num2[1];
		eDay = num2[2];
		int month;
		int DAY = Sign(sYear,sMonth) - sDay + eDay;
		if(sYear != eYear) {
			for(int year = sYear;year < eYear; year ++) {
				if(year == sYear) {
					month = sMonth + 1;
				}
				else month = 1;
				for(;month <= 12;month ++) {
					DAY = DAY + Sign(year,month);
				}
			}
			for(int newYue = 1;newYue <= eMonth;newYue ++) {
				DAY += Sign(eYear,newYue);
			}
		}
		else
		{
			if(sMonth == eMonth) {
				DAY = eDay - sDay;
			}
			else {
				for(int yue = sMonth + 1;yue <= eMonth; yue ++) {
					DAY += Sign(sYear,yue);
				}
			}
		}
		System.out.println(DAY);
	}
	public static int Sign(int year,int month) {
		int flag = 1;//闰年标志位
		if(year % 400 == 0 ||year % 4 == 0 && year % 100 != 0)
			flag = 1;
		else 
			flag = 0;
		if(month == 1||month == 3||month == 5||month == 7||month == 8||month == 10||month == 12)
			return 31;
		else if(month == 2)
			return 28 + flag;
		else 
			return 30;
	}
}