The Intl.DateTimeFormat.prototype.format() method formats a date according to the locale and formatting options of this Intl.DateTimeFormat object.




The date to format.


The format getter formats a date into a string according to the locale and formatting options of this Intl.DateTimeFormat object.


Using format

Use the format getter function for formatting a single date, here for Serbia:

var options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
var dateTimeFormat = new Intl.DateTimeFormat('sr-RS', options);
console.log(dateTimeFormat.format(new Date()));
// → "недеља, 7. април 2013."

Using format with map

Use the format getter function for formatting all dates in an array. Note that the function is bound to the Intl.DateTimeFormat from which it was obtained, so it can be passed directly to Array.prototype.map().

var a = [new Date(2012, 08), new Date(2012, 11), new Date(2012, 03)];
var options = { year: 'numeric', month: 'long' };
var dateTimeFormat = new Intl.DateTimeFormat('pt-BR', options);
var formatted = a.map(dateTimeFormat.format);
console.log(formatted.join('; '));
// → "setembro de 2012; dezembro de 2012; abril de 2012"

Avoid comparing formatted date values to static values

Most of the time, the formatting returned by format() is consistent. However, this might change in the future and isn't guaranteed for all the languages — output variations are by design and allowed by the specification. Most notably, the IE and Edge browsers insert bidirectional control characters around dates, so the output text will flow properly when concatenated with other text.

For this reason you cannot expect to be able to compare the results of format() to a static value:

let d = new Date("2019-01-01T00:00:00.000000Z");
let formattedDate = Intl.DateTimeFormat(undefined, {
  year: 'numeric',
  month: 'numeric',
  day: 'numeric',
  hour: 'numeric',
  minute: 'numeric',
  second: 'numeric'

"1.1.2019, 01:00:00" === formattedDate;
// true in Firefox and others
// false in IE and Edge

Note: See also this StackOverflow thread for more details and examples.


Browser compatibilityUpdate compatibility data on GitHub

Chrome Edge Firefox Internet Explorer Opera Safari
format 24 12 29 11 15 10
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
format 4.4 25 56 14 10 1.5
format 0.12
Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.

See also

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