下面是一种更通用的方法，它允许日期和时间组件，并且可以作为数字或字符串进行相同的排序。

根据“Date ISO format”中的数字顺序，转换为本地时区，去掉非数字。例如:

// monkey patch version
Date.prototype.IsoNum = function (n) {
    var tzoffset = this.getTimezoneOffset() * 60000; //offset in milliseconds
    var localISOTime = (new Date(this - tzoffset)).toISOString().slice(0,-1);
    return localISOTime.replace(/[-T:\.Z]/g, '').substring(0,n || 20); // YYYYMMDD
}

使用

var d = new Date();
// Tue Jul 28 2015 15:02:53 GMT+0200 (W. Europe Daylight Time)
console.log(d.IsoNum(8));  // "20150728"
console.log(d.IsoNum(12)); // "201507281502"
console.log(d.IsoNum());   // "20150728150253272"

Moment.js可以成为你的朋友

var date = new Date();
var formattedDate = moment(date).format('YYYYMMDD');

<pre>Date.prototype.getFromFormat = function(format) {
    var yyyy = this.getFullYear().toString();
    format = format.replace(/yyyy/g, yyyy)
    var mm = (this.getMonth()+1).toString(); 
    format = format.replace(/mm/g, (mm[1]?mm:"0"+mm[0]));
    var dd  = this.getDate().toString();
    format = format.replace(/dd/g, (dd[1]?dd:"0"+dd[0]));
    var hh = this.getHours().toString();
    format = format.replace(/hh/g, (hh[1]?hh:"0"+hh[0]));
    var ii = this.getMinutes().toString();
    format = format.replace(/ii/g, (ii[1]?ii:"0"+ii[0]));
    var ss  = this.getSeconds().toString();
    format = format.replace(/ss/g, (ss[1]?ss:"0"+ss[0]));
    var ampm = (hh >= 12) ? "PM" : "AM";
    format = format.replace(/ampm/g, (ampm[1]?ampm:"0"+ampm[0]));
    return format;
};
var time_var = $('#899_TIME');
var myVar = setInterval(myTimer, 1000);
function myTimer() {
    var d = new Date(); 
    var date = d.getFromFormat('dd-mm-yyyy hh:ii:ss:ampm');
    time_var.text(date);

} </pre>

use the code and get the output like **26-07-2017 12:29:34:PM**

check the below link for your reference

https://parthiban037.wordpress.com/2017/07/26/date-and-time-format-in-oracle-apex-using-javascript/ 

回答另一个简单性和可读性的问题。 此外，不鼓励使用新方法编辑现有的预定义类成员:

function getDateInYYYYMMDD() {
    let currentDate = new Date();

    // year
    let yyyy = '' + currentDate.getFullYear();

    // month
    let mm = ('0' + (currentDate.getMonth() + 1));  // prepend 0 // +1 is because Jan is 0
    mm = mm.substr(mm.length - 2);                  // take last 2 chars

    // day
    let dd = ('0' + currentDate.getDate());         // prepend 0
    dd = dd.substr(dd.length - 2);                  // take last 2 chars

    return yyyy + "" + mm + "" + dd;
}

var currentDateYYYYMMDD = getDateInYYYYMMDD();
console.log('currentDateYYYYMMDD: ' + currentDateYYYYMMDD);

一个衬线(2022)，带正确的时区偏移

var dateDisplay = new Date(Date.now() - (new Date().getTimezoneOffset() * 1000 * 60)).toJSON().slice(0, 10).replaceAll("-", "");

// YearMonthDay var dateDisplay = new Date(Date.now() - (new Date().getTimezoneOffset() * 1000 * 60)).toJSON().slice(0, 10).replaceAll("-", ""); console.log("YearMonthDay"); console.log(dateDisplay); // Year-Month-Day var dateDisplay = new Date(Date.now() - (new Date().getTimezoneOffset() * 1000 * 60)).toJSON().slice(0, 10); console.log("Year-Month-Day"); console.log(dateDisplay); // Year-Month-Day Hour:Minute:Second var dateDisplay = new Date(Date.now() - (new Date().getTimezoneOffset() * 1000 * 60)).toJSON().slice(0, 19).replace("T", " "); console.log("Year-Month-Day Hour:Minute:Second"); console.log(dateDisplay); // Year-Month-Day Hour-Minute-Second var dateDisplay = new Date(Date.now() - (new Date().getTimezoneOffset() * 1000 * 60)).toJSON().slice(0, 19).replace("T", " ").replaceAll(":", "-"); console.log("Year-Month-Day Hour-Minute-Second"); console.log(dateDisplay); // ISO-8601 standard: YYYY-MM-DDTHH:mm:ss.sssZ var dateDisplay = new Date(Date.now() - (new Date().getTimezoneOffset() * 1000 * 60)).toJSON(); console.log("ISO-8601 standard: YYYY-MM-DDTHH:mm:ss.sssZ"); console.log(dateDisplay);

您可以创建自己的函数，如下所示

function toString(o, regex) {
    try {
        if (!o) return '';
        if (typeof o.getMonth === 'function' && !!regex) {
            let splitChar = regex.indexOf('/') > -1 ? '/' : regex.indexOf('-') > -1 ? '-' : regex.indexOf('.') > -1 ? '.' : '';
            let dateSeparate = regex.split(splitChar);
            let result = '';
            for (let item of dateSeparate) {
                let val = '';
                switch (item) {
                    case 'd':
                        val = o.getDate();
                        break;
                    case 'dd':
                        val = this.date2Char(o.getDate());
                        break;
                    case 'M':
                        val = o.getMonth() + 1;
                        break;
                    case 'MM':
                        val = this.date2Char(o.getMonth() + 1);
                        break;
                    case 'yyyy':
                        val = o.getFullYear();
                        break;
                    case 'yy':
                        val = this.date2Char(o.getFullYear());
                        break;
                    default:
                        break;
                }
                result += val + splitChar;
            }
            return result.substring(0, result.length - 1);
        } else {
            return o.toString();
        }
    } catch(ex) { return ''; }
}

function concatDateToString(args) {
    if (!args.length) return '';
    let result = '';
    for (let i = 1; i < args.length; i++) {
        result += args[i] + args[0];
    }
    return result.substring(0, result.length - 1);
}

function date2Char(d){
    return this.rightString('0' + d);
}

function rightString(o) {
    return o.substr(o.length - 2);
}

使用:

var a = new Date();
console.log('dd/MM/yyyy: ' + toString(a, 'dd/MM/yyyy'));
console.log('MM/dd/yyyy: ' + toString(a, 'MM/dd/yyyy'));
console.log('dd/MM/yy: ' + toString(a, 'dd/MM/yy'));
console.log('MM/dd/yy: ' + toString(a, 'MM/dd/yy'));