在JavaScript中增加日期 [英] Incrementing a date in JavaScript

问题描述

我需要在JavaScript中增加一天的日期值。

例如，我有一个日期值2010-09-11，我需要存储日期在JavaScript变量中。

如何按日增加日期？

解决方案

您的三个选择：

1。使用JavaScript的日期对象（无库）：

我之前对＃1的答案是错误的（它添加了24小时，未能考虑到夏令时间的过渡; 聪明的人类指出，将在11月失败7，2010年在东部时区）。相反， Jigar的回答是没有库的正确方法： / p>

  var tomorrow = new Date 
 tomorrow.setDate（tomorrow.getDate（）+ 1）; 
  

即使在一个月（或一年）的最后一天也是如此，因为JavaScript日期对象是关于翻转的智能：

  var lastDayOf2015 = new Date 2015年11月31日）; snippet.log（2015年最后一天：+ lastDayOf2015.toISOString（））; var nextDay = new Date（lastDayOf2015）; var dateValue = nextDay.getDate（）+ 1; snippet.log 将date日期设置为+ dateValue）; nextDay.setDate（dateValue）; snippet.log（生成日期：+ nextDay.toISOString（））;  

 <！ - 脚本提供`snippet`对象，请参见http://meta.stackexchange.com/a / 242144/134069  - >< script src =// tjcrowder.github.io/simple-snippets-console/snippet.js\"></script> 

（此答案目前被接受，所以我无法删除。在被接受之前，我建议OP接受Jigar，但也许他们接受了这个项目＃2或＃3在列表中。）

2。使用 MomentJS ：

  var tomorrow = moment（今）.add（1，'day'）; 
  

（当心添加修改实例调用它，而不是返回一个新的实例，所以 today.add（'days'，1）将修改今天这就是为什么我们从 var tomorrow = ... 开始克隆操作。）

3。使用 DateJS ，但尚未在很长时间内更新：

  var today = new Date（）; //或Date.today（）
 var tomorrow = today.add（1）.day（）; 
  

I need to increment a date value by one day in JavaScript.

For example, I have a date value 2010-09-11 and I need to store the date of the next day in a JavaScript variable.

How can I increment a date by a day?

解决方案

Three options for you:

1. Using just JavaScript's Date object (no libraries):

My previous answer for #1 was wrong (it added 24 hours, failing to account for transitions to and from daylight saving time; Clever Human pointed out that it would fail with November 7, 2010 in the Eastern timezone). Instead, Jigar's answer is the correct way to do this without a library:

var tomorrow = new Date();
tomorrow.setDate(tomorrow.getDate() + 1);

This works even for the last day of a month (or year), because the JavaScript date object is smart about rollover:

var lastDayOf2015 = new Date(2015, 11, 31);
snippet.log("Last day of 2015: " + lastDayOf2015.toISOString());
var nextDay = new Date(lastDayOf2015);
var dateValue = nextDay.getDate() + 1;
snippet.log("Setting the 'date' part to " + dateValue);
nextDay.setDate(dateValue);
snippet.log("Resulting date: " + nextDay.toISOString());

<!-- Script provides the `snippet` object, see http://meta.stackexchange.com/a/242144/134069 -->
<script src="//tjcrowder.github.io/simple-snippets-console/snippet.js"></script>

(This answer is currently accepted, so I can't delete it. Before it was accepted I suggested to the OP they accept Jigar's, but perhaps they accepted this one for items #2 or #3 on the list.)

2. Using MomentJS:

var today = moment();
var tomorrow = moment(today).add(1, 'day');

(Beware that add modifies the instance you call it on, rather than returning a new instance, so today.add('days', 1) would modify today. That's why we start with a cloning op on var tomorrow = ....)

3. Using DateJS, but it hasn't been updated in a long time:

var today = new Date(); // Or Date.today()
var tomorrow = today.add(1).day();

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