Java计算两个日期相差的天数详解编程语言

java根据开始时间和结束时间，计算中间天数，并打印

import java.text.SimpleDateFormat; 
import java.util.Date; 
  
  
public class Calcdate { 
    static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 
    static SimpleDateFormat ymd = new SimpleDateFormat("yyyy-MM-dd"); 
  
    public static void main(String[] args)throws Exception{ 
        Date beginTime = sdf.parse("2015-04-23 12:32:44"); 
//        Date endTime = sdf.parse("2015-04-23 14:56:44"); 
        Date endTime = sdf.parse("2015-04-29 14:56:44"); 
  
        long diff = (endTime.getTime() - beginTime.getTime()) / (86400 * 1000); 
        System.out.println("diff = " + diff); 
  
        Date sb = null; 
        Date se = null; 
        if(diff == 0){ 
            sb = beginTime; 
            se = endTime; 
  
            String ss = String.format("%d> Sb=%s, Se=%s", 1, Coder.DateTimeToStr(sb), Coder.DateTimeToStr(se)); 
            System.out.println(ss); 
        }else { 
            int i = 0; 
            while (i <= diff) { 
                if (i == 0) { 
                    sb = beginTime; 
                    se = sdf.parse(ymd.format(sb) + " 23:59:59"); 
                } else if (i == diff) { 
                    sb = sdf.parse(ymd.format(endTime) + " 00:00:00"); 
                    se = endTime; 
                } else { 
                    se = new Date(beginTime.getTime() + i * 24 * 60 * 60 * 1000); 
                    sb = sdf.parse(ymd.format(se) + " 00:00:00"); 
                    se = sdf.parse(ymd.format(se) + " 23:59:59"); 
                } 
  
                String ss = String.format("%d> Sb=%s, Se=%s", i, Coder.DateTimeToStr(sb), Coder.DateTimeToStr(se)); 
                System.out.println(ss); 
  
                i++; 
            } 
        } 
    } 
}