Format JavaScript date as yyyy-mm-dd

I have a date with the format Sun May 11,2014. How can I convert it to 2014-05-11 using JavaScript?

function taskDate(dateMilli) {
    var d = (new Date(dateMilli) + '').split(' ');
    d[2] = d[2] + ',';

    return [d[0], d[1], d[2], d[3]].join(' ');
}

var datemilli = Date.parse('Sun May 11,2014');
console.log(taskDate(datemilli));

The code above gives me the same date format, sun may 11,2014. How can I fix this?

Just leverage the built-in toISOString method that brings your date to the ISO 8601 format:

let yourDate = new Date()
yourDate.toISOString().split('T')[0]

Where yourDate is your date object.

Edit: @exbuddha wrote this to handle time zone in the comments:

const offset = yourDate.getTimezoneOffset()
yourDate = new Date(yourDate.getTime() - (offset*60*1000))
return yourDate.toISOString().split('T')[0]

You can do:

function formatDate(date) {
    var d = new Date(date),
        month = '' + (d.getMonth() + 1),
        day = '' + d.getDate(),
        year = d.getFullYear();

    if (month.length < 2) 
        month = '0' + month;
    if (day.length < 2) 
        day = '0' + day;

    return [year, month, day].join('-');
}
 
console.log(formatDate('Sun May 11,2014'));

Usage example:

console.log(formatDate('Sun May 11,2014'));

Output:

2014-05-11

Demo on JSFiddle: http://jsfiddle.net/abdulrauf6182012/2Frm3/

I use this way to get the date in format yyyy-mm-dd :)

var todayDate = new Date().toISOString().slice(0, 10);
console.log(todayDate);

2020 ANSWER

You can use the native .toLocaleDateString() function which supports several useful params like locale (to select a format like MM/DD/YYYY or YYYY/MM/DD), timezone (to convert the date) and formats details options (eg: 1 vs 01 vs January).

Examples

const testCases = [
  new Date().toLocaleDateString(), // 8/19/2020
  new Date().toLocaleString(undefined, {year: 'numeric', month: '2-digit', day: '2-digit', weekday:"long", hour: '2-digit', hour12: false, minute:'2-digit', second:'2-digit'}),
  new Date().toLocaleDateString('en-US', {year: 'numeric', month: '2-digit', day: '2-digit'}), // 08/19/2020 (month and day with two digits)
  new Date().toLocaleDateString('en-ZA'), // 2020/08/19 (year/month/day) notice the different locale
  new Date().toLocaleDateString('en-CA'), // 2020-08-19 (year-month-day) notice the different locale
  new Date().toLocaleString("en-US", {timeZone: "America/New_York"}), // 8/19/2020, 9:29:51 AM. (date and time in a specific timezone)
  new Date().toLocaleString("en-US", {hour: '2-digit', hour12: false, timeZone: "America/New_York"}),  // 09 (just the hour)
]

for (const testData of testCases) {
  console.log(testData)
}

Notice that sometimes to output a date in your specific desire format, you have to find a compatible locale with that format. You can find the locale examples here: https://www.w3schools.com/jsref/tryit.asp?filename=tryjsref_tolocalestring_date_all

Please notice that locale just change the format, if you want to transform a specific date to a specific country or city time equivalent then you need to use the timezone param.

The simplest way to convert your date to the yyyy-mm-dd format, is to do this:

var date = new Date("Sun May 11,2014");
var dateString = new Date(date.getTime() - (date.getTimezoneOffset() * 60000 ))
                    .toISOString()
                    .split("T")[0];

How it works:

• new Date("Sun May 11,2014") converts the string "Sun May 11,2014" to a date object that represents the time Sun May 11 2014 00:00:00 in a timezone based on current locale (host system settings)
• new Date(date.getTime() - (date.getTimezoneOffset() * 60000 )) converts your date to a date object that corresponds with the time Sun May 11 2014 00:00:00 in UTC (standard time) by subtracting the time zone offset
• .toISOString() converts the date object to an ISO 8601 string 2014-05-11T00:00:00.000Z
• .split("T") splits the string to array ["2014-05-11", "00:00:00.000Z"]
• [0] takes the first element of that array

---

Demo

var date = new Date("Sun May 11,2014"); var dateString = new Date(date.getTime() - (date.getTimezoneOffset() * 60000 )) .toISOString() .split("T")[0];

console.log(dateString);

A combination of some of the answers:

var d = new Date(date);
date = [
  d.getFullYear(),
  ('0' + (d.getMonth() + 1)).slice(-2),
  ('0' + d.getDate()).slice(-2)
].join('-');

format = function date2str(x, y) {
    var z = {
        M: x.getMonth() + 1,
        d: x.getDate(),
        h: x.getHours(),
        m: x.getMinutes(),
        s: x.getSeconds()
    };
    y = y.replace(/(M+|d+|h+|m+|s+)/g, function(v) {
        return ((v.length > 1 ? "0" : "") + z[v.slice(-1)]).slice(-2)
    });

    return y.replace(/(y+)/g, function(v) {
        return x.getFullYear().toString().slice(-v.length)
    });
}

Result:

format(new Date('Sun May 11,2014'), 'yyyy-MM-dd')
"2014-05-11

If you don't have anything against using libraries, you could just use the Moments.js library like so:

var now = new Date();
var dateString = moment(now).format('YYYY-MM-DD');

var dateStringWithTime = moment(now).format('YYYY-MM-DD HH:mm:ss');

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>

You can use toLocaleDateString('fr-CA') on Date object

console.log(new Date('Sun May 11,2014').toLocaleDateString('fr-CA'));

Also I found out that those locales give right result from this locales list https://stackoverflow.com/questions/3191664/list-of-all-locales-and-their-short-codes

'en-CA'
'fr-CA'
'lt-LT'
'sv-FI'
'sv-SE'

var localesList = ["af-ZA",
  "am-ET",
  "ar-AE",
  "ar-BH",
  "ar-DZ",
  "ar-EG",
  "ar-IQ",
  "ar-JO",
  "ar-KW",
  "ar-LB",
  "ar-LY",
  "ar-MA",
  "arn-CL",
  "ar-OM",
  "ar-QA",
  "ar-SA",
  "ar-SY",
  "ar-TN",
  "ar-YE",
  "as-IN",
  "az-Cyrl-AZ",
  "az-Latn-AZ",
  "ba-RU",
  "be-BY",
  "bg-BG",
  "bn-BD",
  "bn-IN",
  "bo-CN",
  "br-FR",
  "bs-Cyrl-BA",
  "bs-Latn-BA",
  "ca-ES",
  "co-FR",
  "cs-CZ",
  "cy-GB",
  "da-DK",
  "de-AT",
  "de-CH",
  "de-DE",
  "de-LI",
  "de-LU",
  "dsb-DE",
  "dv-MV",
  "el-GR",
  "en-029",
  "en-AU",
  "en-BZ",
  "en-CA",
  "en-GB",
  "en-IE",
  "en-IN",
  "en-JM",
  "en-MY",
  "en-NZ",
  "en-PH",
  "en-SG",
  "en-TT",
  "en-US",
  "en-ZA",
  "en-ZW",
  "es-AR",
  "es-BO",
  "es-CL",
  "es-CO",
  "es-CR",
  "es-DO",
  "es-EC",
  "es-ES",
  "es-GT",
  "es-HN",
  "es-MX",
  "es-NI",
  "es-PA",
  "es-PE",
  "es-PR",
  "es-PY",
  "es-SV",
  "es-US",
  "es-UY",
  "es-VE",
  "et-EE",
  "eu-ES",
  "fa-IR",
  "fi-FI",
  "fil-PH",
  "fo-FO",
  "fr-BE",
  "fr-CA",
  "fr-CH",
  "fr-FR",
  "fr-LU",
  "fr-MC",
  "fy-NL",
  "ga-IE",
  "gd-GB",
  "gl-ES",
  "gsw-FR",
  "gu-IN",
  "ha-Latn-NG",
  "he-IL",
  "hi-IN",
  "hr-BA",
  "hr-HR",
  "hsb-DE",
  "hu-HU",
  "hy-AM",
  "id-ID",
  "ig-NG",
  "ii-CN",
  "is-IS",
  "it-CH",
  "it-IT",
  "iu-Cans-CA",
  "iu-Latn-CA",
  "ja-JP",
  "ka-GE",
  "kk-KZ",
  "kl-GL",
  "km-KH",
  "kn-IN",
  "kok-IN",
  "ko-KR",
  "ky-KG",
  "lb-LU",
  "lo-LA",
  "lt-LT",
  "lv-LV",
  "mi-NZ",
  "mk-MK",
  "ml-IN",
  "mn-MN",
  "mn-Mong-CN",
  "moh-CA",
  "mr-IN",
  "ms-BN",
  "ms-MY",
  "mt-MT",
  "nb-NO",
  "ne-NP",
  "nl-BE",
  "nl-NL",
  "nn-NO",
  "nso-ZA",
  "oc-FR",
  "or-IN",
  "pa-IN",
  "pl-PL",
  "prs-AF",
  "ps-AF",
  "pt-BR",
  "pt-PT",
  "qut-GT",
  "quz-BO",
  "quz-EC",
  "quz-PE",
  "rm-CH",
  "ro-RO",
  "ru-RU",
  "rw-RW",
  "sah-RU",
  "sa-IN",
  "se-FI",
  "se-NO",
  "se-SE",
  "si-LK",
  "sk-SK",
  "sl-SI",
  "sma-NO",
  "sma-SE",
  "smj-NO",
  "smj-SE",
  "smn-FI",
  "sms-FI",
  "sq-AL",
  "sr-Cyrl-BA",
  "sr-Cyrl-CS",
  "sr-Cyrl-ME",
  "sr-Cyrl-RS",
  "sr-Latn-BA",
  "sr-Latn-CS",
  "sr-Latn-ME",
  "sr-Latn-RS",
  "sv-FI",
  "sv-SE",
  "sw-KE",
  "syr-SY",
  "ta-IN",
  "te-IN",
  "tg-Cyrl-TJ",
  "th-TH",
  "tk-TM",
  "tn-ZA",
  "tr-TR",
  "tt-RU",
  "tzm-Latn-DZ",
  "ug-CN",
  "uk-UA",
  "ur-PK",
  "uz-Cyrl-UZ",
  "uz-Latn-UZ",
  "vi-VN",
  "wo-SN",
  "xh-ZA",
  "yo-NG",
  "zh-CN",
  "zh-HK",
  "zh-MO",
  "zh-SG",
  "zh-TW",
  "zu-ZA"
];

localesList.forEach(lcl => {
  if ("2014-05-11" === new Date('Sun May 11,2014').toLocaleDateString(lcl)) {
    console.log(lcl, new Date('Sun May 11,2014').toLocaleDateString(lcl));
  }
});

Simply use this:

var date = new Date('1970-01-01'); // Or your date here
console.log((date.getMonth() + 1) + '/' + date.getDate() + '/' +  date.getFullYear());

Simple and sweet ;)

Shortest

.toJSON().slice(0,10);

var d = new Date('Sun May 11,2014' +' UTC');   // Parse as UTC
let str = d.toJSON().slice(0,10);              // Show as UTC

console.log(str);

toISOString() assumes your date is local time and converts it to UTC. You will get an incorrect date string.

The following method should return what you need.

Date.prototype.yyyymmdd = function() {         
                            
    var yyyy = this.getFullYear().toString();                                    
    var mm = (this.getMonth()+1).toString(); // getMonth() is zero-based         
    var dd  = this.getDate().toString();             
                        
    return yyyy + '-' + (mm[1]?mm:"0"+mm[0]) + '-' + (dd[1]?dd:"0"+dd[0]);
};

Source: https://blog.justin.kelly.org.au/simple-javascript-function-to-format-the-date-as-yyyy-mm-dd/

Retrieve year, month, and day, and then put them together. Straight, simple, and accurate.

function formatDate(date) {
    var year = date.getFullYear().toString();
    var month = (date.getMonth() + 101).toString().substring(1);
    var day = (date.getDate() + 100).toString().substring(1);
    return year + "-" + month + "-" + day;
}

//Usage example:
alert(formatDate(new Date()));

You can try this: https://www.npmjs.com/package/timesolver

npm i timesolver

Use it in your code:

const timeSolver = require('timeSolver');
const date = new Date();
const dateString = timeSolver.getString(date, "YYYY-MM-DD");

You can get the date string by using this method:

getString

To consider the timezone also, this one-liner should be good without any library:

new Date().toLocaleString("en-IN", {timeZone: "Asia/Kolkata"}).split(',')[0]

new Date().toLocaleDateString('pt-br').split( '/' ).reverse( ).join( '-' );

or

new Date().toISOString().split('T')[0]
new Date('23/03/2020'.split('/').reverse().join('-')).toISOString()
new Date('23/03/2020'.split('/').reverse().join('-')).toISOString().split('T')[0]

Try this!

const formatDate = d => [
    d.getFullYear(),
    (d.getMonth() + 1).toString().padStart(2, '0'),
    d.getDate().toString().padStart(2, '0')
].join('-');

You can make use of padstart.

padStart(n, '0') ensures that a minimum of n characters are in a string and prepends it with '0's until that length is reached.

join('-') concatenates an array, adding '-' symbol between every elements.

getMonth() starts at 0 hence the +1.

The 2021 solution using Intl.

The new Intl Object is now supported on all browsers.
You can choose the format by choosing a "locale" that uses the required format.

The Swedish locale uses the format "yyyy-mm-dd":

// Create a date
const date = new Date(2021, 10, 28);

// Create a formatter using the "sv-SE" locale
const dateFormatter = Intl.DateTimeFormat('sv-SE');

// Use the formatter to format the date
console.log(dateFormatter.format(date)); // "2021-11-28"

Downsides of using Intl:

• You cannot "unformat" or "parse" strings using this method

• You have to search for the required format (for instance on Wikipedia) and cannot use a format-string like "yyyy-mm-dd"

I suggest using something like formatDate-js instead of trying to replicate it every time. Just use a library that supports all the major strftime actions.

new Date().format("%Y-%m-%d")

When ES2018 rolls around (works in chrome) you can simply regex it

(new Date())
    .toISOString()
    .replace(
        /^(?<year>\d+)-(?<month>\d+)-(?<day>\d+)T.*$/,
        '$<year>-$<month>-$<day>'
    )

2020-07-14

Or if you'd like something pretty versatile with no libraries whatsoever

(new Date())
    .toISOString()
    .match(
        /^(?<yyyy>\d\d(?<yy>\d\d))-(?<mm>0?(?<m>\d+))-(?<dd>0?(?<d>\d+))T(?<HH>0?(?<H>\d+)):(?<MM>0?(?<M>\d+)):(?<SSS>(?<SS>0?(?<S>\d+))\.\d+)(?<timezone>[A-Z][\dA-Z.-:]*)$/
    )
    .groups

Which results in extracting the following

{
    H: "8"
    HH: "08"
    M: "45"
    MM: "45"
    S: "42"
    SS: "42"
    SSS: "42.855"
    d: "14"
    dd: "14"
    m: "7"
    mm: "07"
    timezone: "Z"
    yy: "20"
    yyyy: "2020"
}

Which you can use like so with replace(..., '$<d>/$<m>/\'$<yy> @ $<H>:$<MM>') as at the top instead of .match(...).groups to get

14/7/'20 @ 8:45

Unfortunately, JavaScript's Date object has many pitfalls. Any solution based on Date's builtin toISOString has to mess with the timezone, as discussed in some other answers to this question. The clean solution to represent an ISO-8601 date (without time) is given by Temporal.PlainDate from the Temporal proposal. As of February 2021, you have to choose the workaround that works best for you.

use Date with vanilla string concatenation

Assuming that your internal representation is based on Date, you can perform manual string concatenation. The following code avoids some of Date's pitfalls (timezone, zero-based month, missing 2-digit formatting), but there might be other issues.

function vanillaToDateOnlyIso8601() {
  // month May has zero-based index 4
  const date = new Date(2014, 4, 11);

  const yyyy = date.getFullYear();
  const mm = String(date.getMonth() + 1).padStart(2, "0"); // month is zero-based
  const dd = String(date.getDate()).padStart(2, "0");

  if (yyyy < 1583) {
    // TODO: decide how to support dates before 1583
    throw new Error(`dates before year 1583 are not supported`);
  }

  const formatted = `${yyyy}-${mm}-${dd}`;
  console.log("vanilla", formatted);
}

use Date with helper library (e.g. formatISO from date-fns)

This is a popular approach, but you are still forced to handle a calendar date as a Date, which represents

> a single moment in time in a platform-independent format

The following code should get the job done, though:

import { formatISO } from "date-fns";

function dateFnsToDateOnlyIso8601() {
  // month May has zero-based index 4
  const date = new Date(2014, 4, 11);
  const formatted = formatISO(date, { representation: "date" });
  console.log("date-fns", formatted);
}

find a library that properly represents dates and times

I wish there was a clean and battle-tested library that brings its own well-designed date–time representations. A promising candidate for the task in this question was LocalDate from @js-joda/core, but the library is less active than, say, date-fns. When playing around with some example code, I also had some issues after adding the optional @js-joda/timezone.

However, the core functionality works and looks very clean to me:

import { LocalDate, Month } from "@js-joda/core";

function jodaDateOnlyIso8601() {
  const someDay = LocalDate.of(2014, Month.MAY, 11);
  const formatted = someDay.toString();
  console.log("joda", formatted);
}

experiment with the Temporal-proposal polyfill

This is not recommended for production, but you can import the future if you wish:

import { Temporal } from "proposal-temporal";

function temporalDateOnlyIso8601() {
  // yep, month is one-based here (as of Feb 2021)
  const plainDate = new Temporal.PlainDate(2014, 5, 11);
  const formatted = plainDate.toString();
  console.log("proposal-temporal", formatted);
}

Here is one way to do it:

var date = Date.parse('Sun May 11,2014');

function format(date) {
  date = new Date(date);

  var day = ('0' + date.getDate()).slice(-2);
  var month = ('0' + (date.getMonth() + 1)).slice(-2);
  var year = date.getFullYear();

  return year + '-' + month + '-' + day;
}

console.log(format(date));

Date.js is great for this.

require("datejs")
(new Date()).toString("yyyy-MM-dd")

None of these answers quite satisfied me. I wanted a cross-platform solution that gave me the day in the local timezone without using any external libraries.

This is what I came up with:

function localDay(time) {
  var minutesOffset = time.getTimezoneOffset()
  var millisecondsOffset = minutesOffset*60*1000
  var local = new Date(time - millisecondsOffset)
  return local.toISOString().substr(0, 10)
}

That should return the day of the date, in YYYY-MM-DD format, in the timezone the date references.

So for example, localDay(new Date("2017-08-24T03:29:22.099Z")) will return "2017-08-23" even though it's already the 24th at UTC.

You'll need to polyfill Date.prototype.toISOString for it to work in Internet Explorer 8, but it should be supported everywhere else.

A few of the previous answer were OK, but they weren't very flexible. I wanted something that could really handle more edge cases, so I took @orangleliu 's answer and expanded on it. https://jsfiddle.net/8904cmLd/1/

function DateToString(inDate, formatString) {
    // Written by m1m1k 2018-04-05

    // Validate that we're working with a date
    if(!isValidDate(inDate))
    {
        inDate = new Date(inDate);
    }

    // See the jsFiddle for extra code to be able to use DateToString('Sun May 11,2014', 'USA');
    //formatString = CountryCodeToDateFormat(formatString);

    var dateObject = {
        M: inDate.getMonth() + 1,
        d: inDate.getDate(),
        D: inDate.getDate(),
        h: inDate.getHours(),
        m: inDate.getMinutes(),
        s: inDate.getSeconds(),
        y: inDate.getFullYear(),
        Y: inDate.getFullYear()
    };

    // Build Regex Dynamically based on the list above.
    // It should end up with something like this: "/([Yy]+|M+|[Dd]+|h+|m+|s+)/g"
    var dateMatchRegex = joinObj(dateObject, "+|") + "+";
    var regEx = new RegExp(dateMatchRegex,"g");
    formatString = formatString.replace(regEx, function(formatToken) {
        var datePartValue = dateObject[formatToken.slice(-1)];
        var tokenLength = formatToken.length;

        // A conflict exists between specifying 'd' for no zero pad -> expand
        // to '10' and specifying yy for just two year digits '01' instead
        // of '2001'.  One expands, the other contracts.
        //
        // So Constrict Years but Expand All Else
        if (formatToken.indexOf('y') < 0 && formatToken.indexOf('Y') < 0)
        {
            // Expand single digit format token 'd' to
            // multi digit value '10' when needed
            var tokenLength = Math.max(formatToken.length, datePartValue.toString().length);
        }
        var zeroPad = (datePartValue.toString().length < formatToken.length ? "0".repeat(tokenLength) : "");
        return (zeroPad + datePartValue).slice(-tokenLength);
    });

    return formatString;
}

Example usage:

DateToString('Sun May 11,2014', 'MM/DD/yy');
DateToString('Sun May 11,2014', 'yyyy.MM.dd');
DateToString(new Date('Sun Dec 11,2014'),'yy-M-d');

If you use momentjs, now they include a constant for that format YYYY-MM-DD:

date.format(moment.HTML5_FMT.DATE)

In the most of cases (no time zone handling) this is enough:

date.toISOString().substring(0,10)

Reformatting a date string is fairly straightforward, e.g.

var s = 'Sun May 11,2014';

function reformatDate(s) {
  function z(n){return ('0' + n).slice(-2)}
  var months = [,'jan','feb','mar','apr','may','jun',
                 'jul','aug','sep','oct','nov','dec'];
  var b = s.split(/\W+/);
  return b[3] + '-' +
    z(months.indexOf(b[1].substr(0,3).toLowerCase())) + '-' +
    z(b[2]);
}

console.log(reformatDate(s));

function myYmd(D){
    var pad = function(num) {
        var s = '0' + num;
        return s.substr(s.length - 2);
    }
    var Result = D.getFullYear() + '-' + pad((D.getMonth() + 1)) + '-' + pad(D.getDate());
    return Result;
}

var datemilli = new Date('Sun May 11,2014');
document.write(myYmd(datemilli));

Yet another combination of the answers. Nicely readable, but a little lengthy.

function getCurrentDayTimestamp() {
  const d = new Date();

  return new Date(
    Date.UTC(
      d.getFullYear(),
      d.getMonth(),
      d.getDate(),
      d.getHours(),
      d.getMinutes(),
      d.getSeconds()
    )
  // `toIsoString` returns something like "2017-08-22T08:32:32.847Z"
  // and we want the first part ("2017-08-22")
  ).toISOString().slice(0, 10);
}

This worked for me to get the current date in the desired format (YYYYMMDD HH:MM:SS):

var d = new Date();

var date1 = d.getFullYear() + '' +
            ((d.getMonth()+1) < 10 ? "0" + (d.getMonth() + 1) : (d.getMonth() + 1)) +
            '' +
            (d.getDate() < 10 ? "0" + d.getDate() : d.getDate());

var time1 = (d.getHours() < 10 ? "0" + d.getHours() : d.getHours()) +
            ':' +
            (d.getMinutes() < 10 ? "0" + d.getMinutes() : d.getMinutes()) +
            ':' +
            (d.getSeconds() < 10 ? "0" + d.getSeconds() : d.getSeconds());

print(date1+' '+time1);

var d = new Date("Sun May 1,2014");

var year  = d.getFullYear();
var month = d.getMonth() + 1;
var day   = d.getDate(); 

month = checkZero(month);             
day   = checkZero(day);

var date = "";

date += year;
date += "-";
date += month;
date += "-";
date += day;

document.querySelector("#display").innerHTML = date;
    
function checkZero(i) 
{
    if (i < 10) 
    {
        i = "0" + i
    };  // add zero in front of numbers < 10

    return i;
}

<div id="display"></div>

new Date(new Date(YOUR_DATE.toISOString()).getTime() - 
                 (YOUR_DATE.getTimezoneOffset() * 60 * 1000)).toISOString().substr(0, 10)

No library is needed

Just pure JavaScript.

The example below gets the last two months from today:

var d = new Date()
d.setMonth(d.getMonth() - 2);
var dateString = new Date(d);
console.log('Before Format', dateString, 'After format', dateString.toISOString().slice(0,10))

PHP compatible date format

Here is a small function which can take the same parameters as the PHP function date() and return a date/time string in JavaScript.

Note that not all date() format options from PHP are supported. You can extend the parts object to create the missing format-token

/** * Date formatter with PHP "date()"-compatible format syntax. */ const formatDate = (format, date) => { if (!format) { format = 'Y-m-d' } if (!date) { date = new Date() }

  const parts = {
    Y: date.getFullYear().toString(),
    y: ('00' + (date.getYear() - 100)).toString().slice(-2),
    m: ('0' + (date.getMonth() + 1)).toString().slice(-2),
    n: (date.getMonth() + 1).toString(),
    d: ('0' + date.getDate()).toString().slice(-2),
    j: date.getDate().toString(),
    H: ('0' + date.getHours()).toString().slice(-2),
    G: date.getHours().toString(),
    i: ('0' + date.getMinutes()).toString().slice(-2),
    s: ('0' + date.getSeconds()).toString().slice(-2)
  }

  const modifiers = Object.keys(parts).join('')
  const reDate = new RegExp('(?<!\\\\)[' + modifiers + ']', 'g')
  const reEscape = new RegExp('\\\\([' + modifiers + '])', 'g')

  return format
    .replace(reDate, $0 => parts[$0])
    .replace(reEscape, ($0, $1) => $1)
}

// ----- EXAMPLES ----- console.log( formatDate() ); // "2019-05-21" console.log( formatDate('H:i:s') ); // "16:21:32" console.log( formatDate('Y-m-d, o\n H:i:s') ); // "2019-05-21, on 16:21:32" console.log( formatDate('Y-m-d', new Date(2000000000000)) ); // "2033-05-18"

Gist

Here is a gist with an updated version of the formatDate() function and additional examples: https://gist.github.com/stracker-phil/c7b68ea0b1d5bbb97af0a6a3dc66e0d9

If the date needs to be the same across all time zones, for example represents some value from the database, then be sure to use UTC versions of the day, month, fullyear functions on the JavaScript date object as this will display in UTC time and avoid off-by-one errors in certain time zones.

Even better, use the Moment.js date library for this sort of formatting.

Format and finding maximum and minimum date from hashmap data:

var obj = {"a":'2001-15-01', "b": '2001-12-02' , "c": '2001-1-03'};

function findMaxMinDate(obj){ let formatEncode = (id)=> { let s = id.split('-'); return ${s[0]+'-'+s[2]+'-'+s[1]}} let formatDecode = (id)=> { let s = id.split('/'); return ${s[2]+'-'+s[0]+'-'+s[1]}} let arr = Object.keys( obj ).map(( key )=> { return new Date(formatEncode(obj[key])); }); let min = new Date(Math.min.apply(null, arr)).toLocaleDateString(); let max = new Date(Math.max.apply(null, arr)).toLocaleDateString(); return {maxd: ${formatDecode(max)}, mind:${formatDecode(min)}} }

console.log(findMaxMinDate(obj));

This code change the order of DD MM YYYY

function convertDate(format, date) {
    let formatArray = format.split('/');
    if (formatArray.length != 3) {
        console.error('Use a valid Date format');
        return;
    }
    function getType(type) { return type == 'DD' ? d.getDate() : type == 'MM' ? d.getMonth() + 1 : type == 'YYYY' && d.getFullYear(); }
    function pad(s) { return (s < 10) ? '0' + s : s; }
    var d = new Date(date);
    return [pad(getType(formatArray[0])), pad(getType(formatArray[1])), getType(formatArray[2])].join('/');
}

const today = new Date(); // or whatever 

const yearFirstFormater = (date): string => {
    const modifiedDate = new Date(date).toISOString().slice(0, 10);
    return `${modifiedDate.split('-')[0]}/${modifiedDate.split('-')[1]}/${modifiedDate.split('-')[2]}`;
}

const monthFirstFormater = (date): string => {
    const modifiedDate = new Date(date).toISOString().slice(0, 10);
    return `${modifiedDate.split('-')[1]}/${modifiedDate.split('-')[2]}/${modifiedDate.split('-')[0]}`;
}

const dayFirstFormater = (date): string => {
    const modifiedDate = new Date(date).toISOString().slice(0, 10);
    return `${modifiedDate.split('-')[2]}/${modifiedDate.split('-')[1]}/${modifiedDate.split('-')[0]}`;
}

console.log(yearFirstFormater(today));
console.log(monthFirstFormater(today));
console.log(dayFirstFormater(today));

formatDate(date) {
  const d = new Date(date)
  const ye = new Intl.DateTimeFormat('en', { year: 'numeric' }).format(d);
  const mo = new Intl.DateTimeFormat('en', { month: 'short' }).format(d);
  const da = new Intl.DateTimeFormat('en', { day: '2-digit' }).format(d);
  return `${da}-${mo}-${ye}`;
}

console.log("Formatated Date : ", formatDate("09/25/2020") )
// Output :: Formatated Date : 25-Sep-2020

Follow up on https://stackoverflow.com/a/29774197/1189762 This is what I had to change regarding the offset for when people are east or west from the Greenwich Mean Time:

export const toNativeHtml5InputDate = (date) => {
  if (!date) return date;

  let offset = new Date(date).getTimezoneOffset();

  offset =
	offset < 0
      ? offset * -1 // east from Greenwich Mean Time
      : offset; // west from Greenwich Mean Time

  return new Date(new Date(date).getTime() + offset * 60 * 1000)
	.toISOString()
	.split('T')[0];
};

All given answers are great and helped me big. In my situation, I wanted to get the current date in yyyy mm dd format along with date-1. Here is what worked for me.

var endDate = new Date().toISOString().slice(0, 10); // To get the Current Date in YYYY MM DD Format

var newstartDate = new Date();
newstartDate.setDate(newstartDate.getDate() - 1);
var startDate = newstartDate.toISOString().slice(0, 10); // To get the Yesterday's Date in YYYY MM DD Format
alert(startDate);

I modified Samit Satpute's response as follows:

var newstartDate = new Date();
// newstartDate.setDate(newstartDate.getDate() - 1);
var startDate = newstartDate.toISOString().replace(/[-T:\.Z]/g, ""); //.slice(0, 10); // To get the Yesterday's Date in YYYY MM DD Format
console.log(startDate);

It is easily accomplished by my date-shortcode package:

const dateShortcode = require('date-shortcode')
dateShortcode.parse('{YYYY-MM-DD}', 'Sun May 11,2014')
//=> '2014-05-11'

We run constantly into problems like this. Every solution looks so individual. But looking at php, we have a way dealing with different formats. And there is a port of php's strtotime function at https://locutus.io/php/datetime/strtotime/. A small open source npm package from me as an alternative way:

<script type="module">
import { datebob } from "@dipser/datebob.js";
console.log( datebob('Sun May 11, 2014').format('Y-m-d') ); 
</script>

See datebob.js

This worked for me, and you can paste this directly into your HTML if needed for testing:

<script type="text/javascript">
    if (datefield.type!="date"){ // If the browser doesn't support input type="date",
                                 // initialize date picker widget:
        jQuery(function($){ // On document.ready
            $('#Date').datepicker({
                dateFormat: 'yy-mm-dd', // THIS IS THE IMPORTANT PART!!!
                showOtherMonths: true,
                selectOtherMonths: true,
                changeMonth: true,
                minDate: '2016-10-19',
                maxDate: '2016-11-03'
            });
        })
    }
</script>