使用 jquery/javascript 从日期中获取日期

Getting day from date using jquery/javascript

提问by Om3ga

I have a date in this formate "YYYY/MM/DD". Now I want to get the day from this format. How can I get it using javascript or jquery? One way is this

我在这个格式中有一个日期“YYYY/MM/DD”。现在我想从这种格式中获得一天。如何使用 javascript 或 jquery 获取它？一种方法是这样

 $(document).ready(function() {

var d = new Date();

alert(d.getDay());
 } );

but the problem here is that d variable contains date in this format

但这里的问题是 d 变量包含这种格式的日期

Sat Jan 07 2012 18:16:57 GMT+0200 (FLE Standard Time)

How can I get day from date in above format?

如何以上述格式从日期中获取日期？

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Here is how my function look like

这是我的功能的样子

function dayOfWeek(d) {
            var dayNames = new Array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Sunday');
            var currentDate = Math.round(+new Date(d)/1000);
            var nData = new Date(currentDate);
            //alert(nData);
            //alert(nData.getDay());
            //var day = d.split("-")[2];
            //var t = day.replace("0","");
            //alert(t);
            return dayNames[nData.getDay()];
        }

What I am doing is I am passing date in "YYYY-MM-DD" format and it converts that date to unix timestamp and then I get the day and then return the day as Sunday or Monday etc. But here it only returns Friday which is incorrect. When I change the day in date it should return the same day in array.

我正在做的是我以“YYYY-MM-DD”格式传递日期，并将该日期转换为unix时间戳，然后获取日期，然后将日期返回为星期日或星期一等。但在这里它只返回星期五是不正确的。当我更改日期时，它应该在数组中返回同一天。

采纳答案by FK82

The DateObjecthas a toStringmethod which outputs a UTC date string in the format you described. However the DateObjectalso has a host of other methods.

所述DateObject具有toString其输出在您所描述的格式的UTC日期字符串方法。然而，DateObject也有许多其他方法。

To get the day of the month (1-31) you use the getDatemethod:

d = new Date( ).getDate( ) ;

要获取月份中的第几天 (1-31)，您可以使用以下getDate方法：

d = new Date( ).getDate( ) ;

Your date string has a format that will not get recognized by the Datestring constructor. Test this line for its return value:

您的日期字符串的格式不会被Date字符串构造函数识别。测试此行的返回值：

var nData = new Date(currentDate) ;

It will return:

它将返回：

"invalid Date"

If your date format (d) is this,

如果您的日期格式 ( d) 是这样的，

"dd-mm-yyyy"

do this,

做这个，

var a = d.split("-") ;
var date = new Date( a[2], (a[1] - 1), a[0] ) ;

this should net you a working DateObject. Or use the datepicker plug-in for jQuery as described in this post.

这应该会让你工作DateObject。或在此描述的使用日期选择器插件的jQuery岗位。

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Link to MDN documentation

链接到 MDN 文档

回答by Jukka K. Korpela

Instead of using built-in Date to string conversions, which are implementation-dependent, and instead of coding the logic yourself, it is best to use a suitable library. Here's one simple way of doing it using Globalize.js:

与其使用依赖于实现的内置 Date 到字符串的转换，也不要自己编写逻辑代码，最好使用合适的库。这是使用Globalize.js的一种简单方法：

function dayOfWeek(s) {
  var d = Globalize.parseDate(s, 'yyyy/M/d');
  if(d == null) { 
    return null;
  } else {
   return Globalize.format(d, 'dddd');
  }
}

This will parse input in the format YYYY/MM/DD (with obvious modifications if your actual format is YYYY-MM-DD), more exactly so that the year is in 4 digits (yyyy) and the month (M) and day (d) may be in 1 or 2 digits (use MM and dd instead if you wish to enforce 2 digits). Then it writes the date so that only the day of the week is written, as a word (dddd). If the input is not of the specified format, the function returns null, and you should of course have some planned error handling for this case.

这将以 YYYY/MM/DD 格式解析输入（如果您的实际格式是 YYYY-MM-DD，则有明显的修改），更准确地说，年份是 4 位数字 (yyyy) 和月份 (M) 和日期 ( d) 可以是 1 位或 2 位数字（如果您希望强制使用 2 位数字，请改用 MM 和 dd）。然后它写入日期，以便只写入星期几，作为一个字 (dddd)。如果输入不是指定的格式，则该函数返回 null，您当然应该针对这种情况进行一些有计划的错误处理。

As an extra bonus, the code will be globalization-ready: if you ever need to modify the code to produce the names in another language, you just add one function invocation that sets the locale (language) for Globalize.js.

作为额外的好处，代码将支持全球化：如果您需要修改代码以生成另一种语言的名称，您只需添加一个函数调用来设置 Globalize.js 的区域设置（语言）。

回答by Gadde

var d=new Date();
var weekday=new Array(7);
weekday[0]="Sunday";
weekday[1]="Monday";
weekday[2]="Tuesday";
weekday[3]="Wednesday";
weekday[4]="Thursday";
weekday[5]="Friday";
weekday[6]="Saturday";

var n = weekday[d.getDay()];

check

查看

回答by Snake Eyes

Regarding to new updated code:

关于新的更新代码：

$(function()
  {
$("a").click(function () {
            var dayNames = new Array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday');
            var nData = new Date();
            //alert(nData);
            //alert(nData.getDay());
            //var day = d.split("-")[2];
            //var t = day.replace("0","");
            //alert(t);
            alert(dayNames[nData.getDay()]);
        });
});

the above code is an example. Edit http://jsfiddle.net/qgDHB/with your needs.

上面的代码是一个例子。根据您的需要编辑http://jsfiddle.net/qgDHB/。

I removed some lines which are not needed.

我删除了一些不需要的行。

回答by Darren Cook

Inspired by the Globalize answer above, here is how to do it in the Sugar.jslibrary:

受上面 Globalize 答案的启发，以下是如何在Sugar.js库中执行此操作：

<script src="sugar.min.js"></script>
...
var test = Date.create(d);
console.log(test.format("{Weekday}"));

dcan be in loads of different formats (including string or secs-since-1970 or JS Date object) and the output format choices are equally comprehensive.

d可以加载不同的格式（包括字符串或 secs-since-1970 或 JS Date 对象），并且输出格式选择同样全面。

Sugar.js is 17.9K minified and gzipped (which includes all the other features it adds, not just the date stuff); that is about twice the size of Moment.js, the alternative I was considering. But Moment.js does not have the equivalent of the {dow}or {weekday}formats.

Sugar.js 是 17.9K 压缩和 gzip（包括它添加的所有其他功能，而不仅仅是日期内容）；这大约是我正在考虑的替代方案 Moment.js 的两倍。但是 Moment.js 没有{dow}或{weekday}格式的等价物。

回答by megakorre

Is the "format" you are talking about a regular string?

您所说的“格式”是常规字符串吗？

then you can do this

那么你可以这样做

var theDay = theDate.split("/")[2];