Java 在 Joda-Time DateTime 中添加一天
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Add one day into Joda-Time DateTime
提问by user1156041
I have date Wed May 08 00:00:00 GMT+06:30 2013. I add one day into it by using Joda-TimeDateTimelike this.
我有约会Wed May 08 00:00:00 GMT+06:30 2013。我像这样使用Joda-Time DateTime将一天添加到其中。
DateTime dateTime = new DateTime(date);
dateTime.plusDays(1);
When I print dateTime, I got this date 2013-05-08T00:00:00.000+06:30. The joda date time didn't add one day. I haven't found any error.
当我打印 dateTime 时，我得到了这个 date 2013-05-08T00:00:00.000+06:30。joda 日期时间没有增加一天。我没有发现任何错误。
Thanks
谢谢
采纳答案by Don Roby
The plusDaysmethod is not a mutator. It returns a copy of the given DateTimeobject with the change made rather than changing the given object.
该plusDays方法不是突变器。它返回给定DateTime对象的副本，并进行更改，而不是更改给定对象。
If you want to actually change the variable dateTimevalue, you'll need:
如果要实际更改变dateTime量值，则需要：
DateTime dateTime = new DateTime(date);
dateTime = dateTime.plusDays(1);
回答by Ilya
If you want add days to current date time instance, use MutableDateTime
如果要将天数添加到当前日期时间实例，请使用MutableDateTime
MutableDateTime dateTime = new MutableDateTime(date);
dateTime.addDays(1);
