1256

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?

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6
  • Really consider using a library like Moment.js. It will format in desired result :) Commented Jan 28, 2016 at 19:14
  • 17
    Why using a library when 5 line of code can do the work ? @Ankur Commented May 15, 2017 at 7:15
  • Possible duplicate of Where can I find documentation on formatting a date in JavaScript? Commented Jul 11, 2018 at 18:08
  • Related: What are valid Date Time Strings in JavaScript? Note that "Sun May 11,2014" is not a valid date string and parsing it might fail in some browsers. Commented Feb 9, 2019 at 12:33
  • @Black Mamba why use library when few line do trick Commented Jul 20, 2022 at 15:44

56 Answers 56

Reset to default
1
2
1653

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]
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17 Comments

BE CAREFUL with this method as it first converts to the date to UTC. If you are in a + timezone and your time portion is early in the day, then it could roll-back a day. Alternatively, if you're in a - timezone and your time portion is late in the day, then it could roll forward a day.
Try this instead: new Date(yourDateStr).toISOString().split('T')[0]
const offset = yourDate.getTimezoneOffset(); yourDate = new Date(yourDate.getTime() + (offset*60*1000)); yourDate.toISOString().split('T')[0] this should solve the issue of timezone
now.toISOString().substring(0,10); This is a cleaner alternative, since it reminds you that YYYY-MM-DD are the first ten characters of the complete iso format
Note: using the helpful solution commented by @mjwrazor, I had to subtract instead of add the offset to get the correct date (change the + (offset to a - (offset)
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998

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/

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10 Comments

Really multiple variable declarations in the same statement? stackoverflow.com/questions/694102/…
@Fuser97381 Multiple variable declarations in the same statement is more than just an aesthetic style preference. It is a dangerous practice. If you inadvertently fail add a comma after each declaration you end up creating global variables. Not something that should be encouraged on what may become the canonical answer to a question.
'use strict'; @bhspencer
Reformatting a date string should not depend on successful parsing of non-standard strings by the built-in parser. Given the OP format, it can be reformatted in less code without using a Date at all.
this works like a charm but I don't understand why javascript does not have a native solution for this... I mean, we are in 2020 and date is an important aspect to web apps.
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437

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'}), // 'Wednesday, 14/06/2023, 13:43:57'
  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.

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20 Comments

For my case where I didn't need the time zones, new Date().toLocaleDateString('en-CA') was perfect
The exact format of .toLocaleDateString('en-CA') is not portable and will break in newer browsers! It recently changed from yyyy-MM-dd to M/d/yyyy in browsers with ICU 72 (Chrome 110 and Firefox 110 beta). Do not make assumptions about specific the specific formatting of locales. Use one of the answers based on .toISOString().
@SamBarnum That…is the wrong lesson to learn here. There’s no guarantee sv-SE won’t change in the future too. If you’re parsing the result, use .toISOString().
Thank God they reverted it back. So can use en-CA again. unicode-org.atlassian.net/browse/CLDR-16399
This answer doesn't directly address the question. The gist here is essentially "try your luck with using a non-default locale"… and even then there is no explicit solution in the many (unrelated) examples given
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415

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

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

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8 Comments

How do you handle the date switching by a day as mentioned here by @Luke_Baulch?
You can do this: var todayDate = new Date(); todayDate.setMinutes(todayDate.getMinutes() - todayDate.getTimezoneOffset()); todayDate.toISOString().slice(0,10); This should help avoid the UTC problem.
@FernandoAguilar One doubt though, how do we know we need to subtract the offset or add it?
Doesn't always work. It sometimes subtracts a day due to UTC conversion.
UTC!!!! in australia we are +10 timezone. Because I tend to fix things in afternoon it has taken me a week to find this.
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246

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);

Note :

The first part of the code (new Date(...)) may need to be tweaked a bit if your input format is different from that of the OP. As mikeypie pointed out in the comments, if the date string is already in the expected output format and the local timezone is west of UTC, then new Date('2022-05-18') results in 2022-05-17. And a user's locale (eg. MM/DD/YYYY vs DD-MM-YYYY) may also impact how a date is parsed by new Date(...). So do some proper testing if you want to use this code for different input formats.

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10 Comments

No one else is aghast that this is the simplest way??
@JoeDevmon : I don't see how that's relevant here. The - (date.getTimezoneOffset() * 60000 ) bit should eliminate any timezone differences, including the impact of daylight savings time.
@JohnSlegers that's what I was thinking, but then I was still getting the day before in some cases. I refactored and your example works now. I must have had a weird date string or something. Thanks for sticking with it and pointing that out. +1 👍
I've searched high and low across SO and other sites to find the best way to deal with timezone issues with dates in JS, and hands down, this is by far the easiest and the best. Thank you!
It sad but it is simpliest way to format js date to string you need. I'm new in js, but in java it is 100 times easier to format date to any format. That is why was thinking there are easier way, but after I tried different solutions I choose this one. Thank you for your answer.
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98

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('-');
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4 Comments

I like the solution the best - easy to read, and does not rely on toISOString() and the potential timezone pitfalls with using that function.
this is the first one that doesn't make my brain hurt.
This fails in Chrome if the date string is already in the expected output format and the local timezone is west of UTC: d = new Date('2022-05-18') results in '2022-05-17'. That means that if the user's locale format is not '5/18/2022' this might also break.
@mikeypie Not true. You just simply got the date parsing wrong, since new Date('2022-05-18') will be parsed as UTC date 2022-05-18T00:00:00.000Z, and this simply corresponds to a local time on 2022-05-17 if you're west of UTC.
64 
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
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3 Comments

I like the additional flexibility that this solution gives over the other answers to this question. I haven't thoroughly tested this, but for the format I desired (i.e. "yyyy-MM-dd hh:mm:ss"), it works just as expected.
here's a version which avoids the eval and comments better jsfiddle.net/8904cmLd/2
"H" should be capitalized, not "h" (small)
61

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>

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4 Comments

Cool solution, but its a 300kb package
Applied in react project: npm install moment --save import moment from 'moment'; const showEventDate = moment(your-date-here).format('YYYY-MM-DD; HH:mm A'); A pure solution for presenting date/time in any format. It gives local date-time with AM/PM and whatever you need just changing the format. Moment.js also provides easy date/time counting solution.
@theTradeCoder as Adam mentioned above the size of moment is pretty large (I think it is more like 67kb, but still) so you should consider that when evaluating the ease of use and utility of any dependency. There are smaller alternatives (day.js = 2kb).
Just an update about the moment.js library that - moment.js is already discontinued.
57

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 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));
  }
});

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6 Comments

Any idea why this works? Is ISO format just the default, or do these locales genuinely use that format? If it's the former I'd be concerned that it could change unexpectedly in the future.
THis is not working with NodeJS outside of browser.
@jymbob I think these locales genuinely use those formats. I've came to the same answer by looking at this Wikipedia page: en.wikipedia.org/wiki/Date_format_by_country
After 3 days, and trawling through too many SO javascript date questions, and trying to ask a new question (30 mins before closed as duplicate) here at last is an answer that is actually correct. I could weep.
en-CA no longer works in new Chrome
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30

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"
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3 Comments

but where is the time?
The question was only about formatting dates. This answer only returns a formatted date, no time. If you want the time formatted, see if one of the other answers can help you.
Using a locale's format is depending on it to never change. Another answer on this question used Canada's locale to do the same, until it broke. stackoverflow.com/questions/23593052/…
24

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);

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3 Comments

This doesn't work when the client is ahead of the UTC and the date in the UTC time is one day behind the current client date.
We don't need a screenshot for this if you are not in the 00+00 timezone: > d=new Date() ; d.setHours(0,30,0,0) ; d --> Sat Oct 09 2021 00:30:00 GMT+0100 (BST) ; d.toJSON() --> "2021-10-08T23:30:00.000Z"
In snippet I show how to operate on UTC dates (which is timezone independent)
23

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

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

Example

var date = new Date();
console.log(date.toISOString()); // 2022-07-04T07:14:08.925Z
console.log(date.toISOString().substring(0,10)); // 2022-07-04
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3 Comments

note "date" should be a var date = new Date() before this line. Or, just new Date() .toISOString().substring(0,10);
substring(0, 10) will only work for the next ~8000 years
data.offer_start =1972-07-10 00:00:00 data.offer_start.substring(0,10)
21

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 ;)

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4 Comments

padding is not there for 2 letter format. it'll show single digit if date or month is less than 10 that's why can't use this directly.
yess but that can be achived simply using javascript, its totaly upto your requirement i think so , isn't it ? @YatenderSingh
yeah correct but check the title of question "yyyy-mm-dd" format he wants :)
var old_date = new Date(date); var new_date = old_date.getFullYear() + '-' + (old_date.getMonth() + 1) + '-' + old_date.getDate()
20

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/

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Comments

16 
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!

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4 Comments

The second option might display the wrong date because it will display the data in UTC timezone.
NOTE: "en-CA" locale string no longer generates yyyy-mm-dd
toISOString uses timezone
@V319 It uses UTC timezone, no?
15

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()));

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Comments

10 
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.

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Comments

10

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);
}
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Note that the NPM package proposal-temporal is deprecated and should not be used. Developers looking for Temporal polyfills should check github.com/tc39/proposal-temporal#polyfills to see the recommended list of polyfills, which as of today are @js-temporal/polyfill and temporal-polyfill
9

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
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7 Comments

There are several simpler ways to butcher the toISOString string which were already posted before this one. For people who are willing to tolerate the potential inaccuracy of using toISOString, the sheer overhead and code bloat makes this a solution that no one should consider (the first snippet anyway).
Look, man, unless you're trying to reparse dates literally hundreds of thousands of times in a matter of seconds you're not going to see any difference at all, so I don't know where you get off calling it bloat. Like with any other novel answer added to an old, already-answered question; this provides the reader with choice, and maybe, knowledge ("gee, I didnt know regex could do that!"). The reader should know whether or not an answer is appropriate for their usecase, and you insult them.
I never mentioned performance so you can leave the argument about 100,000 iterations. My point is that earlier answers provided simpler techniques.
Yes, but not readable, or easily extensible. You called it bloat, which is literally code...that is perceived as unnecessarily long, slow, or otherwise wasteful of resources. SO is primarily for knowledge, so yes, even though the literal question has been answered, sometimes there are other angles that others (and at least already literally 3▲) find might useful! Imagine that. I don't play the "Fastest Gun In The West" game, so when you see me post a late answer, it is because I have something valuable to offer and I hope that you will acknowledge the care that I take. -some hypocrite
Nothing hypocritical going on here. I am very clear about how the first snippet is far less attractive than simply calling .slice(0,10). slice() is much more concise, direct, readable. I love regex but not for this question. See how I am not attacking you as a person? I am judging your answer to this question.
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8

Simply Retrieve year, month, and day, and then put them together.

    function dateFormat(date) {
        const day = date.getDate();
        const month = date.getMonth() + 1;
        const year = date.getFullYear();

        return `${year}-${month}-${day}`;
    }

    console.log(dateFormat(new Date()));

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For me the day is off by one.
7

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

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

Problem with this is that every locale will return different result. For example en-GB will return 20/12/2012 and ko-KR will return2012. 12. 20.. But format should be yyyy-mm-dd
7

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
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7

This is what I did.

Another alternate short and simple method:-

const date = new Date().toISOString();
console.log(date.substring(0, date.indexOf('T')));

Used substring() with indexOf("T") rather than splitting it into array at character 'T' and accessing element at 0th index.

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Note, that toISOString() always outputs in UTC. If you're trying to display a local time for a user, this can break in edge cases. For example if it's 2024/4/29 locally, but 2024/4/30 UTC, this will output the UTC 2024/04/30 not your local time 2024/04/29.
6

Warning this code does not work in certain versions of Chrome, Node.js, etc.

  • Expected: yyyy-MM-dd
  • Actual: M/d/yyyy

References

Please consider timezones when converting Date to date string.

Two methods can be used.

  • .toISOString(); - Fixed to GMT+0. Includes time, which should be removed later.
  • .toLocaleDateString('en-CA'); - Timezone can be specified. Defaults to system.

Note that en-CA is a locale, not a timezone. Canada uses the YYYY-MM-DD format.

In the following example, the system timezone is set to PDT (GMT-7)

const date = new Date('2023-04-08 GMT+09:00');
// Sat Apr 08 2023 00:00:00 GMT+0900 (한국 표준시)
// Fri Apr 07 2023 08:00:00 GMT-0700 (Pacific Daylight Time)

// Based on GMT+0 or UTC - time is substringed.
date.toISOString(); // '2023-04-07T15:00:00.000Z'
date.toISOString().substring(0, 10); // '2023-04-07'

// Based on GMT-7 - local timezone of the system
date.toLocaleDateString('en-CA'); // '2023-04-07'

// Based on GMT+9 - Asia/Seoul is GMT+9
date.toLocaleDateString('en-CA', { timeZone: 'Asia/Seoul' }); // '2023-04-08'
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Comments

5

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));
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Comments

5

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")
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5

Use the new Temporal proposal (see browser support below) with a PlainDate object:

Temporal.PlainDate.from({ year: 2006, month: 8, day: 24 }).toString() // '2006-08-24'

Or, if you want the date for today:

Temporal.Now.plainDateISO().toString() // '2023-08-25'

Demo with <input type="date" /> (React): https://codesandbox.io/s/hungry-forest-nymhkl?file=/src/App.js

Browser Support

Temporal proposal on Can I use shows lacking support for now (no browsers supporting this as of Aug 2023). So unless this changes by the time you do this, you will need to install @js-temporal/polyfill and apply the polyfill like this:

import { Temporal, Intl, toTemporalInstant } from '@js-temporal/polyfill';
Date.prototype.toTemporalInstant = toTemporalInstant;
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4

Date.js is great for this.

require("datejs")
(new Date()).toString("yyyy-MM-dd")
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4

You can use this function for better format and easy of use:

function convert(date) {
    const d = Date.parse(date)
    const   date_obj = new Date(d)
    return `${date_obj.getFullYear()}-${date_obj.toLocaleString("default", { month: "2-digit" })}-${date_obj.toLocaleString("default", { day: "2-digit"})}`
}

This function will format the month as 2-digit output as well as the days

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4 

const YYYY_MM_DD_Formater = (date) => {
    const t = new Date(date)
    const y = t.getFullYear()
    const m = ('0' + (t.getMonth() + 1)).slice(-2)
    const d = ('0' + t.getDate()).slice(-2)
    return `${y}-${m}-${d}`
}

Update

const YYYY_MM_DD_Formater = (date,format='YYYY-MM-DD') => {
    const t = new Date(date)
    const y = t.getFullYear()
    const m = ('0' + (t.getMonth() + 1)).slice(-2)
    const d = ('0' + t.getDate()).slice(-2)
    return format.replace('YYYY',y).replace('MM',m).replace('DD',d)
}

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