停止 javascript Date 函数更改时区偏移量

问题描述

所以我有需要从字符串转换为日期对象的 iso 日期时间.如何保持日期不将其转换为本地浏览器时区.

So I have iso date time that need to be converted from a string to date object. How do I keep date from converting it to local browser timezone.

new Date('2013-07-18T17:00:00-05:00')
Thu Jul 18 2013 18:00:00 GMT-0400 (EDT)

我想得到

2013 年 7 月 18 日星期四 17:00:00 GMT-0500 (XX)

Thu Jul 18 2013 17:00:00 GMT-0500 (XX)

推荐答案

虽然 MomentJS 是一个很棒的库，但它可能无法为每个用例提供解决方案.例如，我的服务器以 UTC 格式提供日期，并且当日期的时间部分未保存在数据库中(因为它无关紧要)时，客户端会收到一个默认时间全为零的字符串 - 午夜 - 并以+0000 的偏移量.然后浏览器会根据我的本地时区自动调整，并将时间向后拉几个小时，结果是前一天.

While MomentJS is a great library, it may not provide a solution for every use case. For example, my server provides dates in UTC, and when the time portion of the date is not saved in the db (because it's irrelevant), the client receives a string that has a default time of all zeros - midnight - and ends with an offset of +0000. The browser then automatically adjusts for my local time zone and pulls the time back by a few hours, resulting in the previous day.

MomentJs 也是如此.

This is true with MomentJs as well.

一种解决方案是切掉字符串的时间部分，然后按照其他答案中的说明使用 MomentJS.

One solution is to slice off the time portion of the string, and then use MomentJS as described in the other answers.

但是如果 MomentJS 不是一个可行的选择会发生什么，即我已经有很多地方使用 JS Date 并且不想更新这么多代码行?问题是如何首先阻止浏览器根据本地时区转换日期.答案是，当日期是 ISO 格式时，你不能.

But what happens if MomentJS is not a viable option, i.e. I already have many places that use a JS Date and don't want to update so many lines of code? The question is how to stop the browser from converting dates based on local time zone in the first place. And the answer is, when the date is in ISO format, you cannot.

然而，没有规定你传递给 JavaScript 的 Date 构造函数的字符串必须是 ISO 格式.如果您只是将分隔年、月、日的 - 替换为 /，您的浏览器将执行任何转换.

However, there is no rule that says the string you pass to JavaScript's Date constructor must be in ISO format. If you simply replace the - that separates the year, month, and day with a /, your browser will not perform any conversion.

在我的例子中，我只是更改了 Dates 服务器端的格式，问题就解决了，而无需使用 MomentJS 更新所有客户端 JS 日期.

In my case, I simply changed the format of the Dates server-side, and the problem was solved without having to update all the client-side JS dates with MomentJS.

请注意，在解析字符串以创建 Date 实例时，JavaScript 的 Date 类的 MDN 文档会警告不可预测的浏览器行为.

Note that the MDN docs for JavaScript's Date class warn about unpredictable browser-behavior when parsing a string to create a Date instance.

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