Javascript 如何从javascript中的字符串获取月份？

How to get month from string in javascript?

提问by Edward

I have tried

我试过了

     var d=new Date("2012-07-01 00:00:00.0");
     alert(d.getMonth());   

But getting NAN.

但是得到NAN.

I want month as Julyfor the above date.

July以上的日期想要月。

回答by Clyde Lobo

Assuming your date is in YYYY-MM-DD format

假设您的日期是 YYYY-MM-DD 格式

var arr = "2012-07-01 00:00:00.0".split("-");
var months = [ "January", "February", "March", "April", "May", "June",
    "July", "August", "September", "October", "November", "December" ];
var month_index =  parseInt(arr[1],10) - 1;
console.log("The current month is " + months[month_index]);

回答by danielnixon

Using the JavaScript Internationalization API:

使用JavaScript 国际化 API：

var date = new Date("2012-07-01");

var monthName = new Intl.DateTimeFormat("en-US", { month: "long" }).format;
var longName = monthName(date); // "July"

var shortMonthName = new Intl.DateTimeFormat("en-US", { month: "short" }).format;
var shortName = shortMonthName(date); // "Jul"

回答by heretolearn

Try this:

尝试这个：

var str="2012-07-01";   //Set the string in the proper format(best to use ISO format ie YYYY-MM-DD or YYYY-MM-DDTHH:MM:SS)
  var d=new Date(str);  //converts the string into date object
  var m=d.getMonth()+1; //get the value of month
     alert(m);          // Display the month value

NOTE:The getMonth() returns the value in range 0-11. Therefore +1 to the value in range 1-12.

注意：getMonth() 返回 0-11 范围内的值。因此 +1 到 1-12 范围内的值。

回答by lebryant

You will need to create an array for it: http://www.w3schools.com/jsref/jsref_getmonth.asp

您需要为它创建一个数组：http: //www.w3schools.com/jsref/jsref_getmonth.asp

also why not initialise your date as: var d = new Date(2012,7,1);

还有为什么不将您的日期初始化为： var d = new Date(2012,7,1);

回答by david9

Try with this:

试试这个：

var months = [ "January", "February", "March", "April", "May", "June",
   "July", "August", "September", "October", "November", "December" ];
document.write("The current month is " + months[d.getMonth()]);

January->0, February-1 and so on...

一月-> 0，二月-1 等等...

回答by Bat_Programmer

You can use this library to make things easier. http://www.datejs.com/And then try the following code:

你可以使用这个库让事情变得更简单。 http://www.datejs.com/然后试试下面的代码：

var d=new Date.parse("2012-07-01 00:00:00.0");
 alert(d..tString('MMMM'));

回答by voltrevo

Short answer: with the above code most people will get an alert with 6these days because Chrome and Firefox now understand that format. It's 6 and not 7 because Dates understand months as indexes beginning with 0, so 0 is Jan, 1 is Feb, 2 is Mar, etc. . So the simplest fix is this:

简短的回答：使用上面的代码，现在大多数人都会收到警报，6因为 Chrome 和 Firefox 现在可以理解这种格式。它是 6 而不是 7，因为Dates 将月份理解为以 0 开头的索引，因此 0 是 Jan，1 是二月，2 是三月，等等。所以最简单的修复是这样的：

var d=new Date("2012-07-01 00:00:00.0");
var months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
var monthIndex = d.getMonth();
alert(months[monthIndex]);

(Please consider using a different approach to constructing dates though!)

（请考虑使用不同的方法来构建日期！）

Long answer:

长答案：

var d=new Date("2012-07-01 00:00:00.0");

The problem is you are getting an invalid date object because the browser doesn't understand that string. Browsers aren't consistent about this - Chrome and Firefox actually parse it correctly and will alert 6instead of NaN. It's still not a good idea to be imprecise with your formats though - current Safari for example doesn't parse it. Formats that are guaranteed to work are described in https://tools.ietf.org/html/rfc2822#section-3.3.

问题是您得到一个无效的日期对象，因为浏览器不理解该字符串。浏览器对此并不一致 - Chrome 和 Firefox 实际上会正确解析它，并且会发出警报6而不是NaN. 尽管如此，对您的格式不精确仍然不是一个好主意 - 例如，当前的 Safari 不会解析它。https://tools.ietf.org/html/rfc2822#section-3.3中描述了保证有效的格式。

You might prefer to use this constructor though:

不过，您可能更喜欢使用此构造函数：

new Date(year, month[, date[, hours[, minutes[, seconds[, milliseconds]]]]]);

In your example, you would call it like so:

在您的示例中，您可以这样称呼它：

var d=new Date(2012, 6, 1);

Note the 6 and not 7 though! Dates understand months as indexes beginning with 0, so 0 is Jan, 1 is Feb, 2 is Mar, etc. . This is confusing when using the date constructor but easier to convert to Julythat was asked for:

请注意 6 而不是 7！Dates 将月份理解为以 0 开头的索引，因此 0 是 Jan，1 是 Feb，2 是 Mar，等等。这在使用日期构造函数时令人困惑，但更容易转换July为要求的：

var d=new Date(2012, 6, 1);
var months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
var monthIndex = d.getMonth();
alert(months[monthIndex]);

You can learn more about Datehere: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Date

您可以Date在此处了解更多信息：https: //developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Date

回答by Diode

Javascript Date object doesn't store full names of month. So you have to use an array.

Javascript Date 对象不存储月份的全名。所以你必须使用一个数组。

var dateString = "2012-07-01 00:00:00.0";

var monthNames = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

var date = new Date(dateString.replace(" ", "T"));
alert(monthNames [date.getMonth()]);