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

问题描述

我需要在 JavaScript 中将日期值增加一天.

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

例如，我有一个日期值 2010-09-11，我需要将第二天的日期存储在 JavaScript 变量中.

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.

如何将日期增加一天?

推荐答案

三个选项:

我之前对 #1 的回答是错误的(它增加了 24 小时，没有考虑到夏令时的转换；Clever Human 指出它将在东部时区的 2010 年 11 月 7 日失败).相反，Jigar 的答案 是没有库的正确方法:

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:

// To do it in local time
var tomorrow = new Date();
tomorrow.setDate(tomorrow.getDate() + 1);

// To do it in UTC
var tomorrow = new Date();
tomorrow.setUTCDate(tomorrow.getUTCDate() + 1);

这甚至适用于一个月(或一年)的最后一天，因为 JavaScript 日期对象在翻转方面很聪明:

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

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

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

(注意 add 会修改你调用它的实例，而不是返回一个新实例，所以 today.add(1, 'days') 会修改 today.这就是为什么我们从 var today = ... 的克隆操作开始.)

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

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

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