如何从非标准日期格式在 Javascript 中创建新的 Date()
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How to create a new Date() in Javascript from a non-standard date format
提问by Michel
I have a date in this format: dd.mm.yyyy
我有一个这种格式的日期：dd.mm.yyyy
When I instantiate a JavaScript date with it, it gives me a NaN
当我用它实例化一个 JavaScript 日期时，它给了我一个 NaN
In c# I can specify a date format, to say: here you have my string, it's in this format, please make a Datetime of it.
在c#中我可以指定一个日期格式，比如：这里你有我的字符串，它是这种格式，请为它制作一个日期时间。
Is this possible in JavaScript too? If not, is there an easy way?
这在 JavaScript 中也可能吗？如果没有，有没有简单的方法？
I would prefer not to use a substring for day, substring for month etc. because my method must also be capable of german, italian, english etc. dates.
我不想使用子字符串表示日，不使用子字符串表示月等，因为我的方法还必须能够使用德语、意大利语、英语等日期。
回答by CMS
You will need to create a function to extract the date parts and use them with the Dateconstructor.
您将需要创建一个函数来提取日期部分并将它们与Date构造函数一起使用。
Note that this constructor treats months as zero based numbers (0=Jan, 1=Feb, ..., 11=Dec).
请注意，此构造函数将月份视为从零开始的数字 ( 0=Jan, 1=Feb, ..., 11=Dec)。
For example:
例如：
function parseDate(input) {
var parts = input.match(/(\d+)/g);
// note parts[1]-1
return new Date(parts[2], parts[1]-1, parts[0]);
}
parseDate('31.05.2010');
// Mon May 31 2010 00:00:00
Edit:For handling a variable formatyou could do something like this:
编辑：要处理可变格式，您可以执行以下操作：
function parseDate(input, format) {
format = format || 'yyyy-mm-dd'; // default format
var parts = input.match(/(\d+)/g),
i = 0, fmt = {};
// extract date-part indexes from the format
format.replace(/(yyyy|dd|mm)/g, function(part) { fmt[part] = i++; });
return new Date(parts[fmt['yyyy']], parts[fmt['mm']]-1, parts[fmt['dd']]);
}
parseDate('05.31.2010', 'mm.dd.yyyy');
parseDate('31.05.2010', 'dd.mm.yyyy');
parseDate('2010-05-31');
The above function accepts a formatparameter, that should include the yyyymmand ddplaceholders, the separators are not really important, since only digits are captured by the RegExp.
上面的函数接受一个格式参数，它应该包括yyyymm和dd占位符，分隔符并不重要，因为 RegExp 只捕获数字。
You might also give a look to DateJS, a small library that makes date parsing painless...
你也可以看看DateJS，一个让日期解析变得轻松的小库......
回答by Andy E
It's easy enough to split the string into an array and pass the parts directly to the Date object:
很容易将字符串拆分成一个数组并将这些部分直接传递给 Date 对象：
var str = "01.01.2010";
var dmy = str.split(".");
var d = new Date(dmy[2], dmy[1] - 1, dmy[0]);
回答by Ryley
There is no built in way to manipulate dates the way you would like.
没有内置的方法可以按照您想要的方式操作日期。
The jQuery-UI datepickerhas the functionality you want, I'm sure many other libraries have something similar.
在jQuery的UI日期选择您想要的功能，我相信很多其他库也有类似的东西。
$.datepicker.parseDate('dd.mm.yy', '31.12.2007');
回答by Warty
t="01.01.1970"
parts = t.split(".");
for(var i = 0; i < parts.length; i++) parts[i] = parseInt(parts[i], 10);
new Date(parts[2], parts[1]-1, parts[0]);
Date defined as (Year, Month, Date)
Date()'s month parameter takes Month in Zero based index. January = 0, february = 1, march = 2... etc
日期定义为 (Year, Month, Date)
Date() 的月份参数采用基于零的索引中的月份。一月 = 0，二月 = 1，三月 = 2...等等
Parsing the string to an int isn't necessary, but I dislike passing strings into functions and just hoping that JavaScript will "get it"... Sort of like how some people prefer ===
将字符串解析为 int 不是必需的，但我不喜欢将字符串传递给函数，只是希望 JavaScript 能够“得到它”......有点像有些人喜欢 ===
回答by test
Modified version of the accepted answer which supports value and format without 'dd' and uppercase format
已接受答案的修改版本，支持没有“dd”和大写格式的值和格式
function parseDate(input, format) {
format = (format || 'yyyy-mm-dd').toLowerCase(); // default format
var parts = input.match(/(\d+)/g),
i = 0, fmt = {};
// extract date-part indexes from the format
format.replace(/(yyyy|dd|mm)/g, function(part) { fmt[part] = i++; });
return new Date([parts[fmt['yyyy']], parts[fmt['mm']], parts[fmt['dd']]].filter(x => x !== undefined).join('-'));
}
parseDate('10/2018', 'MM/YYYY')
回答by mushood badulla
Building on CMS answer, I created this function to deal with a variable format
基于 CMS 答案，我创建了这个函数来处理可变格式
function parseDate(input, format) {
format = format || 'yyyy-mm-dd'; // default format
//Change from PHP date format to JS
if (format == 'd/m/Y') {
format = 'dd/mm/yyyy';
}
if (format == 'd/m/Y H:i:s') {
format = 'dd/mm/yyyy hh:ii:ss';
}
let date = NaN;
if (format == 'dd/mm/yyyy') {
let parts = input.match(/(\d+)/g),
i = 0, fmt = {};
// extract date-part indexes from the format
format.replace(/(yyyy|dd|mm)/g, function(part) { fmt[part] = parts[i++]; });
//create date for new format
let createdDate = new Date(fmt['yyyy'], fmt['mm']-1, fmt['dd']);
//check if dates are equal by comparing parts. The issue I had here was
//when I passed an invalid value for month, the output was adjustement to
//accomodate for the extra months
if (
createdDate.getFullYear() == fmt['yyyy'] &&
createdDate.getMonth() == (fmt['mm']-1) &&
createdDate.getDate() == fmt['dd']
) {
date = createdDate;
}
}
//same but taking into account hours minute and seccond
if (format == 'dd/mm/yyyy hh:ii:ss') {
let parts = input.match(/(\d+)/g),
i = 0, fmt = {};
// extract date-part indexes from the format
format.replace(/(yyyy|dd|mm|hh|ii|ss)/g,
function(part) { fmt[part] = parts[i++]; });
let createdDate = new Date(
fmt['yyyy'], fmt['mm']-1, fmt['dd'],
fmt['hh'], fmt['ii'], fmt['ss']
);
if (
createdDate.getFullYear() == fmt['yyyy'] &&
createdDate.getMonth() == (fmt['mm']-1) &&
createdDate.getDate() == fmt['dd'] &&
createdDate.getHours() == fmt['hh'] &&
createdDate.getMinutes() == fmt['ii'] &&
createdDate.getSeconds() == fmt['ss']
) {
date = createdDate;
}
}
return date;
}
