在Joda-Time的两个日期之间的天数 [英] Number of days between two dates in Joda-Time

问题描述

如何查找两个 Joda-Time 之间的天数差异 DateTime 实例？
天数差异我的意思是说，如果开始是星期一，结束是在星期二我预计返回值为1，不管开始和结束日期的小时/分/秒。

Days.daysBetween（开始，结束）.getDays（）如果开始是在晚上结束，给我0 / p>

我也和其他日期字段有同样的问题，所以我希望有一个通用的方式来忽略不那么重要的字段。

换句话说，3月2日至4日之间的月份也将是1，14时45分至15时12分之间的时间。但是，14:01和14:55之间的小时差将为0。

解决方案

令人痛心的是，withTimeAtStartOfDay答案是错误的，但是只有偶尔。你想要：

  Days.daysBetween（start.toLocalDate（），end.toLocalDate（））。getDays（）
  

事实证明，午夜/开始的一天有时意味着上午1点（在某些地方这样做是夏令时的事情） ，哪些Days.daysBetween不能正常处理。

  // 2013年10月21日20日下午1点，巴西
 DateTimeZone BRAZIL = DateTimeZone.forID（America / Sao_Paulo）; 
 DateTime start = new DateTime（2013，10，20，5，0，0，BRAZIL）; 
 DateTime end = new DateTime（2013，10，21，13，0，0，BRAZIL）; 
 System.out.println（daysBetween（start.withTimeAtStartOfDay（），
 end.withTimeAtStartOfDay（））。getDays（））; 
 // print 0 
 System.out.println（daysBetween（start.toLocalDate（），
 end.toLocalDate（））。getDays（））; 
 // print 1 
  

通过 LocalDate 回避整个问题。

How do I find the difference in Days between two Joda-Time DateTime instances? With ‘difference in days’ I mean if start is on Monday and end is on Tuesday I expect a return value of 1 regardless of the hour/minute/seconds of the start and end dates.

Days.daysBetween(start, end).getDays() gives me 0 if start is in the evening and end in the morning.

I'm also having the same issue with other date fields so I was hoping there would be a generic way to 'ignore' the fields of lesser significance.

In other words, the months between Feb and 4 March would also be 1, as would the hours between 14:45 and 15:12 be. However the hour difference between 14:01 and 14:55 would be 0.

解决方案

Annoyingly, the withTimeAtStartOfDay answer is wrong, but only occasionally. You want:

Days.daysBetween(start.toLocalDate(), end.toLocalDate()).getDays()

It turns out that "midnight/start of day" sometimes means 1am (daylight savings happen this way in some places), which Days.daysBetween doesn't handle properly.

// 5am on the 20th to 1pm on the 21st, October 2013, Brazil
DateTimeZone BRAZIL = DateTimeZone.forID("America/Sao_Paulo");
DateTime start = new DateTime(2013, 10, 20, 5, 0, 0, BRAZIL);
DateTime end = new DateTime(2013, 10, 21, 13, 0, 0, BRAZIL);
System.out.println(daysBetween(start.withTimeAtStartOfDay(),
                               end.withTimeAtStartOfDay()).getDays());
// prints 0
System.out.println(daysBetween(start.toLocalDate(),
                               end.toLocalDate()).getDays());
// prints 1

Going via a LocalDate sidesteps the whole issue.

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