与雅达时间倒数到圣诞节 [英] Count Down to Christmas with Joda-Time

问题描述

我正在尝试执行 Joda-Time 倒数到圣诞节，但到目前为止我感到震惊我尝试java.util.Date和大多数StackOverflow问题和答案建议使用Joda-Time。但我不能让它工作。一些代码给出不同的答案。

I am trying to implement Joda-Time to count down to Christmas, but so far I'm struck. I tried java.util.Date and most StackOverflow questions and answers suggested to use Joda-Time. But I can't get it working. Some codes give different answers.

以下是我尝试的一些代码，

Here are some codes I tried,

DateTime now = new DateTime();
DateTime christmas = new DateTime(2012, 12, 25, 8, 0, 0, 0);
Days daysToChristmas = Days.daysBetween(today, christmas); 
System.out.println(daysToChristmas.toString());

这样打印 P187D 作为答案。

DateTime start = new DateTime(DateTime.now());
DateTime end = new DateTime(2012, 12, 25, 0, 0, 0 ,0);
Interval interval = new Interval(start, end);
Period period = interval.toPeriod();
System.out.println("Seconds " + period.getSeconds());
System.out.println("Minutes " + period.getMinutes());
System.out.println("Hours " + period.getHours());
System.out.println("Days " + period.getDays());

这将打印以下结果，

Seconds 36
Minutes 21
Hours 7
Days 4

我出错了？

推荐答案

您应该使用 为了确定涉及的月数/天/等等：

You should be using a Period in order to determine the number of months/days/etc involved:

Period period = new Period(start, end);

将间隔转换为一段时间将有一直很好，但是无参数超载包括所有期间单位 - 而您没有打印出这些月份。

Converting an Interval to a period would have been fine too, but parameterless overload includes all period units - and you weren't printing out the months.

现在，如果你只需要天，小时，分钟，秒，那么您需要创建一个适当的 PeriodType ，例如

PeriodType periodType = PeriodType.dayTime().withMillisRemoved();
Period period = new Period(start, end, periodType);

然后你可以要求这些个人字段，一切都应该很好。

Then you can ask for those individual fields, and all should be well.

（实际上你可以使用 dayTime（），因为毫无意图干扰别人。）

(You could actually use just dayTime(), given that the millis won't interfere with anything else.)

所以你可以直接从开始和 end 建立你的期间或者如果您想保留间隔，您可以使用：

So you can either build your period directly from the start and end as above, or if you want to keep the Interval, you can use:

Period period = interval.toPeriod(periodType);

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