如何获取给定日期的月份的最后一天 [英] How to get last day of the month for the given date

问题描述

我有一个给定的日期：

  01/10/2017（mm / dd / yyyy）
 
日历c = c.getInstance（）; 
 
 c.setTime（date）; 
  

现在指向一个月的最后一天，我使用以下代码：

  c.set（Calendar.Date，c.getActualMaximum（Calendar.Date））; 
  

预期输出：01/31/2017

原始输出：02/01/2017

我没有得到预期的输出。它让我回到下个月的第一天。

任何人都可以帮助我吗？

解决方案

Java 8的新日期时间功能在这里：

  LocalDate date = LocalDate.of（2000，Month.OCTOBER，15）; 
 LocalDate lastOfMonth = date.with（TemporalAdjusters.lastDayOfMonth（））; 
 System.out.printf（月的最后一天：％s％n，lastOfMonth）;是的，您理论上也可以使用Calendar对象，并自己进行各种低级操作。但是有机会：你会得到错误的...好吧，除非你看起来这里并遵循那里的建议。
 
 
 
但是，Basil正确地指出：310项目与java.time非常接近（因为后者的设计是为了匹配前者）;和310可以移植返回到Java7。所以如果有不止一个地方需要处理日期，那么我会研究一下：通过使用理智的日期/时间库，让你的生活更轻松。
 
I have a given date:
01/10/2017(mm/dd/yyyy)

Calendar c = c.getInstance();

c.setTime(date);
Now to point to the last day of the month I am using the following code:
c.set(Calendar.Date, c.getActualMaximum(Calendar.Date));



  
Expected Output : 01/31/2017
  
  
Original Output : 02/01/2017
I am not getting the expected output. Its returning me the first day of next month. 

Can anyone please help me?
解决方案
You better use the new date time features of Java 8 here:
LocalDate date = LocalDate.of(2000, Month.OCTOBER, 15);
LocalDate lastOfMonth = date.with(TemporalAdjusters.lastDayOfMonth());
System.out.printf("last day of Month: %s%n", lastOfMonth );
Yes, you could theoretically also use Calendar objects and do all kinds of low level operations yourself. But chances are: you will get that wrong ... well, unless you look here and follow the advise from there.

But as Basil is correctly pointing out: The 310 project is pretty close to java.time (because the later was designed to match the former); and 310 can be "ported" back to Java7. So if there is more than one place where you need to deal with dates, I would look into exactly that: making your life easier by using the "sane" date/time library.

                        
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