用moment.js格式化日期

我有这种格式的字符串：

var testDate = "Fri Apr 12 2013 19:08:55 GMT-0500 (CDT)"

我想使用moment.js以这种格式mm/dd/yyyy : 04/12/2013显示它。

我尝试使用这种方法来做

moment(testDate,'mm/dd/yyyy');

哪些错误并说there is no such method called replace？我是否以错误的方式处理此问题？

编辑：

我还应该提到我使用的是针对meteor.js打包的moment.js的预打包版本

Object [object Date] has no method 'replace' : The Exact error from the console

堆栈跟踪：

 at makeDateFromStringAndFormat (http://127.0.0.1:3000/packages/moment/lib/moment/moment.js?b4e3ac4a3d0794023a4410e7941c3e179398b5b0:539:29)
    at moment (http://127.0.0.1:3000/packages/moment/lib/moment/moment.js?b4e3ac4a3d0794023a4410e7941c3e179398b5b0:652:24)
    at populateProfileForEdit (http://127.0.0.1:3000/client/views/home/administration/directory/profiles/profiles.js?acfff908a6a099f37312f62892a22b40f82e5e0f:147:25)
    at Object.Template.profile_personal.rendered (http://127.0.0.1:3000/client/views/home/administration/directory/profiles/profiles.js?acfff908a6a099f37312f62892a22b40f82e5e0f:130:13)
    at Spark.createLandmark.rendered (http://127.0.0.1:3000/packages/templating/deftemplate.js?b622653d121262e50a80be772bf5b1e55ab33881:126:42)
    at http://127.0.0.1:3000/packages/spark/spark.js?45c746f38023ceb80745f4b4280457e15f058bbc:384:32
    at Array.forEach (native)
    at Function._.each._.forEach (http://127.0.0.1:3000/packages/underscore/underscore.js?867d3653d53e9c7a171483edbcad9670e12288c7:79:11)
    at http://127.0.0.1:3000/packages/spark/spark.js?45c746f38023ceb80745f4b4280457e15f058bbc:382:7
    at _.extend.flush (http://127.0.0.1:3000/packages/deps/deps.js?9642a93ae1f8ffa8eb1c2475b198c764f183d693:231:11) 

的第二个参数moment()是解析格式，而不是显示格式。

为此，您需要.format()方法：

moment(testDate).format('MM/DD/YYYY');

另请注意，情况确实很重要。对于月，月日和年，格式应为大写。

包括moment.js，并使用以下代码可以格式化日期

var formatDate= 1399919400000;

var responseDate = moment(formatDate).format('DD/MM/YYYY');

我的输出是“ 13/05/2014”

moment().format();                                // "2019-08-12T17:52:17-05:00" (ISO 8601, no fractional seconds)
moment().format("dddd, MMMM Do YYYY, h:mm:ss a"); // "Monday, August 12th 2019, 5:52:00 pm"
moment().format("ddd, hA");                       // "Mon, 5PM"

要确定输出日期，请使用format。第二点参数用于解析-但是，如果省略该参数，testDate则将引起弃用警告

弃用警告：提供的值不是公认的RFC2822或ISO格式...

var testDate= "Fri Apr 12 2013 19:08:55 GMT-0500 (CDT)"

let s= moment(testDate).format('MM/DD/YYYY');

msg.innerText= s;

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>

<div id="msg"></div>

要忽略此警告，您应该提供解析格式

var testDate= "Fri Apr 12 2013 19:08:55 GMT-0500 (CDT)"

let s= moment(testDate, 'ddd MMM D YYYY HH:mm:ss ZZ').format('MM/DD/YYYY');

console.log(s);

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>