Web/JavaScript/Reference/Global objects/Intl/DateTimeFormat/format

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

Syntax

dateTimeFormat.format(date)

Parameters

date: The date to format.

Description

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

Examples

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'
}).format(d);

"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.

Specifications

Specification
ECMAScript Internationalization API (ECMA-402)The definition of 'Intl.DateTimeFormat.format' in that specification.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
`format`	Chrome Full support 24	Edge Full support 12	Firefox Full support 29	IE Full support 11	Opera Full support 15	Safari Full support 10	WebView Android Full support 4.4	Chrome Android Full support 25	Firefox Android Full support 56	Opera Android Full support 14	Safari iOS Full support 10	Samsung Internet Android Full support 1.5	nodejs Full support 0.12 Notes' Full support 0.12 Notes' Notes' Before version 13.0.0, only the locale data for `en-US` is available by default. See the `DateTimeFormat()` constructor for more details.

Legend

Full support: Full support
See implementation notes.': See implementation notes.