找出第一个周日/周一每月的日期等 [英] find out the date for first Sunday/Monday etc of the month

问题描述

我要检测第一个星期日/第一/第二周的星期一的日期在java中每月？
我怎样才能实现呢？

I want to detect date of First Sunday/Monday of first/second week in every month in java? How can I achieve it?

我已经检查Calendar类以及Java中日期类，但没能得到该解决方案，请帮我出这一点。

I have checked Calendar class as well as Date class in java but not able to get solution for that so please help me out for this.

推荐答案

使用内置到Java 8 java.time 库：

Java.time

Using java.time library built into Java 8:

import java.time.{DayOfWeek, LocalDate}
import java.time.temporal.TemporalAdjusters.firstInMonth

val now = LocalDate.now() # 2015-11-23
val firstMonday = now.`with`(firstInMonth(DayOfWeek.MONDAY)) # 2015-11-02 (Monday)

您可以选择从 java.time.DayOfWeek任何一天。{周一，周二，周三，周四，周五，周六，周日} 。

如果您需要添加时间信息，你可以使用任何可用的 LOCALDATE 到 LocalDateTime 转换像

If you need to add time information, you may use any available LocalDate to LocalDateTime conversion like

firstMonday.atStartOfDay() # 2015-11-02T00:00

这篇关于找出第一个周日/周一每月的日期等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！