Next you looked at some Joda concepts, and then how to use Joda to do date calculations and formatting.
然后介绍了一些Joda概念，以及如何使用Joda执行日期计算和格式化。
Now that you've seen how to create a few of the more useful Joda classes, I'll show you how to use them to perform date calculations.
现在，您已经了解了如何创建一些非常有用的joda类，我将向您展示如何使用它们执行日期计算。
The API methods I'll show you for doing date calculations all return a new instance of the corresponding Joda class, leaving the original instance unchanged.
我将向您展示的用于处理日期计算的API方法全部返回一个对应joda类的新实例，同时保持原始实例不变。
Contains members that get the current date or time, perform date calculations, return a date or time, set the date or time, or time the duration of a process.
包含的成员会取得目前日期或时间、执行日期计算、传回日期或时间、设定日期或时间，或计算处理序持续期间的时间。
Date calculations aren't difficult in Geronimo systems, as Calendar and Date classes are defined for you.
日期计算在Geronimo系统中并不困难，因为定义了Calendar和date类。
Date calculations aren't difficult in Geronimo systems, as Calendar and Date classes are defined for you.
日期计算在Geronimo系统中并不困难，因为定义了Calendar和date类。
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