java两个日期之间的时间差

Question

我必须找出两个不同日期之间的时间差 我试试这个：

Date d1 = null;
Date d2 = null;
d1 = format.parse(startDate);
d2 = format.parse(endDate);

long diff = d2.getTime() - d1.getTime();

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

但是当我将{}设置为2017年5月15日23:40:10和{}设置为2017年5月16日00:05:55时

输出为：

diffSeconds = -15;
diffMinutes = -25;
diffHours   = -23;

我怎样才能解决这个问题？多谢各位

Answer 1

要么是日期格式错误，要么是切换了开始日期和结束日期

以下方法非常有效：

SimpleDateFormat format = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");

String startDate = "15/05/2017 23:40:10";
String endDate = "16/05/2017 00:05:55";

Date d1 = format.parse(startDate);
Date d2 = format.parse(endDate);

long diff = d2.getTime() - d1.getTime();
long diffSeconds = diff / 1000 % 60;
long diffMinutes = diff / (60 * 1000) % 60;
long diffHours = diff / (60 * 60 * 1000);

System.out.println(diffHours + " " + diffMinutes + " " + diffSeconds);

输出为：

0 25 45