Format JavaScript date as yyyy-mm-dd

Question

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

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Answer 1

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.

Answer 2

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

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

Answer 3

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

new Date().toLocaleDateString() // 8/19/2020

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)

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.

Answer 4

Date.js is great for this.

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

Answer 5

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);

Answer 6

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")