javascript中的Date()如何工作? [英] How does the Date() in javascript work?
问题描述
我正在尝试使用JS中的Date函数将"NINE/MAR/2008"解析为:
I am trying to parse "NINE/MAR/2008" using Date function in JS as:
new Date("NINE/MAR/2008")
这给我的结果是:
2008年3月1日星期六
Sat Mar 01 2008
JS中的日期解析会考虑什么逻辑?
What logic does the date parsing in JS consider?
推荐答案
Date 构造函数和 Date.parse 的 only 格式规范要求支持的是:
The only formats that the Date constructor and Date.parse are required by the specification to support are:
-
ECMAScript第5版引入的一个 ，例如
2015-04-29，它是 ISO-8601 ，但它们混淆了时区(
The one introduced by ECMAScript 5th edition in 2009 such as
2015-04-29, which was meant to be a simplified version of ISO-8601 but they messed up on timezones (fixed in ECMAScript 2015, but then had to be amended again in ECMAScript 2016), and
该JavaScript引擎(未指定)上任何 Date#toString 输出的内容.
Whatever Date#toString outputs on that JavaScript engine (which is not specified).
大多数JavaScript引擎也将解析 mm/dd/yyyy (其中所有数字始终以美国格式，月初)，但这不是 >指定的行为.有些人可能会解析 yyyy/mm/dd (请注意/而不是-)，但这仍然是未定义的行为，尤其是某些引擎可能将其解释为UTC，将其他时间解释为当地时间(这很重要，即使它只是一个没有时间的日期).
Most JavaScript engines will also parse mm/dd/yyyy (where those are all numbers — always in U.S. format, month-first), but that is not specified behavior. Some may parse yyyy/mm/dd (note the / rather than -), but again it's undefined behavior, and in particular some engines may interpret it as UTC and others as local time (and it matters, even if it's just a date without a time on it).
所有其他日期解析必须由您自己的代码或您使用的库中的代码(例如MomentJS)完成.您可以使用
All other date parsing has to be done by your own code or code in a library that you use, such as MomentJS. You can build a Date from its constituent parts using the long form of the constructor, e.g.: new Date(2008, 2, 9) for 9th March, 2008 (note that months start with 0 = January).
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