如何减去两个joda日期时间？

Question

我知道这不是"它应该工作的方式",但仍然是:如果你有两个DateTime对象,那么减去它们的好方法是什么？将它们转换为Date对象？

DateTime start = new DateTime();
System.out.println(start + " - doing some stuff");

// do stuff

DateTime end = new DateTime();
Period diff = // end - start ???
System.out.println(end + " - doing some stuff took diff seconds");

Answer 1

Period有一个构造函数,它接受两个ReadableInstant实例:

Period diff = new Period(start, end);

(ReadableInstant是由DateTime其他类实现的接口.)

Answer 2

从你的例子中你似乎想要几秒钟的差异所以这应该有所帮助:

Seconds diff = Seconds.secondsBetween(start, end);

Answer 3

这有帮助吗？http://joda-time.sourceforge.net/key_period.html 它显示了以下示例

DateTime start = new DateTime(2004, 12, 25, 0, 0, 0, 0);
DateTime end = new DateTime(2006, 1, 1, 0, 0, 0, 0);

// period of 1 year and 7 days
Period period = new Period(start, end);

// calc will equal end
DateTime calc = start.plus(period);

// able to calculate whole days between two dates easily
Days days = Days.daysBetween(start, end);