java - 不同时区的两个 java 日期之间经过的天数

Question

我有两个日期，但一个是 CET，另一个是 CEST。

   Calendar calFrom = Calendar.getInstance();
            calFrom.set( 2013, 2, 20,0,0,0);
            Calendar calTo = Calendar.getInstance();
            calTo.set( 2013, 3, 5,0,0,0);

        long daysPassed= (calTo.getTime().getTime() - calFrom.getTime().getTime()) / (1000 * 60 * 60 * 24);
        System.out.println("calFrom: " + calFrom.getTime());
        System.out.println("calTo: " + calTo.getTime());
        System.out.println("daysPassed: " + daysPassed);

输出显示:

calFrom: Wed Mar 20 00:00:00 CET 2013
calTo: Fri Apr 05 00:00:00 CEST 2013
daysPassed: 15

但是 Microsoft Excel 表示这两天的差异是 16!

如何像Excel一样计算过去的天数？

Answer 1

JodaTime 似乎可以处理这个问题: http://kodejava.org/how-do-i-get-number-of-days-between-two-dates-in-joda/