你可以使用轻量级库Moment js

npm install moment

给图书馆打电话

var moments = require("moment");

现在转换成你需要的格式

moment().format('MMMM Do YYYY, h:mm:ss a');

更多格式和细节，你可以关注官方文档Moment js

appHelper.validateDates = function (start, end) {
    var returnval = false;

    var fd = new Date(start);
    var fdms = fd.getTime();
    var ed = new Date(end);
    var edms = ed.getTime();
    var cd = new Date();
    var cdms = cd.getTime();

    if (fdms >= edms) {
        returnval = false;
        console.log("step 1");
    }
    else if (cdms >= edms) {
        returnval = false;
        console.log("step 2");
    }
    else {
        returnval = true;
        console.log("step 3");
    }
    console.log("vall", returnval)
    return returnval;
}

我需要一个简单的格式化库，不需要locale和语言支持。所以我修改了

http://www.mattkruse.com/javascript/date/date.js

并且使用它。参见https://github.com/adgang/atom-time/blob/master/lib/dateformat.js

文档非常清楚。

我在Nodejs和angularjs中使用dateformat，很好

安装

$ npm install dateformat
$ dateformat --help

demo

var dateFormat = require('dateformat');
var now = new Date();

// Basic usage
dateFormat(now, "dddd, mmmm dS, yyyy, h:MM:ss TT");
// Saturday, June 9th, 2007, 5:46:21 PM

// You can use one of several named masks
dateFormat(now, "isoDateTime");
// 2007-06-09T17:46:21

// ...Or add your own
dateFormat.masks.hammerTime = 'HH:MM! "Can\'t touch this!"';
dateFormat(now, "hammerTime");
// 17:46! Can't touch this!

// You can also provide the date as a string
dateFormat("Jun 9 2007", "fullDate");
// Saturday, June 9, 2007
...

这是我写的一个轻量级的简单日期格式库，可以在node.js和浏览器上运行

安装

使用NPM安装

npm install @riversun/simple-date-format

or

直接加载(浏览器)，

<script src="https://cdn.jsdelivr.net/npm/@riversun/simple-date-format/lib/simple-date-format.js"></script>

加载库

ES6

import SimpleDateFormat from "@riversun/simple-date-format";

CommonJS node.js)

const SimpleDateFormat = require('@riversun/simple-date-format');

Usage1

const date = new Date('2018/07/17 12:08:56');
const sdf = new SimpleDateFormat();
console.log(sdf.formatWith("yyyy-MM-dd'T'HH:mm:ssXXX", date));//to be "2018-07-17T12:08:56+09:00"

用钢笔跑

Usage2

const date = new Date('2018/07/17 12:08:56');
const sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssXXX");
console.log(sdf.format(date));//to be "2018-07-17T12:08:56+09:00"

格式化模式

https://github.com/riversun/simple-date-format#pattern-of-the-date

检查下面的代码和到Date Object, Intl的链接。DateTimeFormat

// var ts_hms = new Date(UTC); // ts_hms.format("%Y-%m-%d %H:%M:%S") // exact format console.log(new Date().toISOString().replace('T', ' ').substring(0, 19)) // other formats console.log(new Date().toUTCString()) console.log(new Date().toLocaleString('en-US')) console.log(new Date().toString()) // log format const parts = new Date().toString().split(' ') console.log([parts[1], parts[2], parts[4]].join(' ')) // intl console.log(new Intl.DateTimeFormat('en-US', {dateStyle: 'long', timeStyle: 'long'}).format(new Date()))