计算java中的日期/时间差 [英] Calculate date/time difference in java

问题描述

我想以小时/分钟/秒为单位计算两个日期之间的差异.

I want to calculate difference between 2 dates in hours/minutes/seconds.

我的代码有一个小问题:

I have a slight problem with my code here it is :

String dateStart = "11/03/14 09:29:58";
String dateStop = "11/03/14 09:33:43";

// Custom date format
SimpleDateFormat format = new SimpleDateFormat("yy/MM/dd HH:mm:ss");  

Date d1 = null;
Date d2 = null;
try {
    d1 = format.parse(dateStart);
    d2 = format.parse(dateStop);
} catch (ParseException e) {
    e.printStackTrace();
}    

// Get msec from each, and subtract.
long diff = d2.getTime() - d1.getTime();
long diffSeconds = diff / 1000;         
long diffMinutes = diff / (60 * 1000);         
long diffHours = diff / (60 * 60 * 1000);                      
System.out.println("Time in seconds: " + diffSeconds + " seconds.");         
System.out.println("Time in minutes: " + diffMinutes + " minutes.");         
System.out.println("Time in hours: " + diffHours + " hours."); 

这应该产生:

Time in seconds: 45 seconds.
Time in minutes: 3 minutes.
Time in hours: 0 hours.

但是我得到了这个结果:

However I get this result :

Time in seconds: 225 seconds.
Time in minutes: 3 minutes.
Time in hours: 0 hours.

谁能看到我在这里做错了什么?

Can anyone see what I'm doing wrong here ?

推荐答案

try

long diffSeconds = diff / 1000 % 60;  
long diffMinutes = diff / (60 * 1000) % 60; 
long diffHours = diff / (60 * 60 * 1000);

注意:这里假设 diff 是非负的.

NOTE: this assumes that diff is non-negative.

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