如果我有一天的具体日期，如何获得上一周的那一天的日期？ [英] If I have a specific date of a day, how do I get the date of that day in the previous week?

问题描述

---

例如，如果我有一个日期，那么请参阅@Basil Bourque 变量date1，值为（dd / mm / yyy）03/07/2011，这是星期天。如何获取上一个星期日date2的日期？这将有价值（dd / mm / yyyy）26/06/2011。

有没有一个简单的方法，例如：

伪代码：

 日期date1 =（03/07/2011）; 
日期date2 = date1.subtractNumberOfDays（7）; 
  

解决方案

java.time

问题和答案使用旧的过时的日期时间类。而是使用java.time类。

LocalDate

LocalDate 类表示只有日期的值，没有时间和时区。

  LocalDate localDate = LocalDate.of（2011，Month.JULY，3）; 
  

或者，将第二个参数中的整数传递给 Month 枚举。

上周

您可以从日期减去一周。

  LocalDate weekPrior = localDate.minusWeeks（1）; 
  

上一个星期之前

如果您想要一周中的特定日期，请使用 TemporalAdjuster 。

在 TemporalAdjusters 课程（注意复数的''）。

  LocalDate beforeTuesday = localDate.with（TemporalAdjusters.previous（DayOfWeek.TUESDAY））; 
  

SEE ANSWER FROM @Basil Bourque for most up to date answer

---

For example, if I have a "Date" variable "date1" with a value of (dd/mm/yyy) 03/07/2011, which is a Sunday. How do I get the "Date" of the previous Sunday "date2"? which would have the value (dd/mm/yyyy) 26/06/2011.

Is there an easy way of doing it, for example:

pseudo code:

Date date1 = (03/07/2011);
Date date2 = date1.subtractNumberOfDays(7);

解决方案

java.time

The Question and Answers use old outmoded date-time classes. Instead use the java.time classes.

LocalDate

The LocalDate class represents a date-only value without time-of-day and without time zone.

LocalDate localDate = LocalDate.of( 2011 , Month.JULY , 3 ); 

Alternatively, pass an integer in second argument instead of the Month enum. Pass 1-12 for January-December.

Previous week

You can subtract a week from the date.

LocalDate weekPrior = localDate.minusWeeks( 1 );

Previous day-of-week

If you want a specific day of the week, use a TemporalAdjuster.

Several such handy implementations provided in the TemporalAdjusters class (note the plural 's').

LocalDate priorTuesday = localDate.with( TemporalAdjusters.previous( DayOfWeek.TUESDAY ) ) ;

这篇关于如果我有一天的具体日期，如何获得上一周的那一天的日期？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！