Intl.DateTimeFormat

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2017.

The Intl.DateTimeFormat object enables language-sensitive date and time formatting.

Try it

const date = new Date(Date.UTC(2020, 11, 20, 3, 23, 16, 738));
// Results below assume UTC timezone - your results may vary

// Specify default date formatting for language (locale)
console.log(new Intl.DateTimeFormat("en-US").format(date));
// Expected output: "12/20/2020"

// Specify default date formatting for language with a fallback language (in this case Indonesian)
console.log(new Intl.DateTimeFormat(["ban", "id"]).format(date));
// Expected output: "20/12/2020"

// Specify date and time format using "style" options (i.e. full, long, medium, short)
console.log(
  new Intl.DateTimeFormat("en-GB", {
    dateStyle: "full",
    timeStyle: "long",
    timeZone: "Australia/Sydney",
  }).format(date),
);
// Expected output: "Sunday, 20 December 2020 at 14:23:16 GMT+11"

Constructor

Intl.DateTimeFormat()

Creates a new Intl.DateTimeFormat object.

Static methods

Intl.DateTimeFormat.supportedLocalesOf()

Returns an array containing those of the provided locales that are supported without having to fall back to the runtime's default locale.

Instance properties

These properties are defined on Intl.DateTimeFormat.prototype and shared by all Intl.DateTimeFormat instances.

Intl.DateTimeFormat.prototype.constructor

The constructor function that created the instance object. For Intl.DateTimeFormat instances, the initial value is the Intl.DateTimeFormat constructor.

Intl.DateTimeFormat.prototype[Symbol.toStringTag]

The initial value of the [Symbol.toStringTag] property is the string "Intl.DateTimeFormat". This property is used in Object.prototype.toString().

Instance methods

Intl.DateTimeFormat.prototype.format()

Getter function that formats a date according to the locale and formatting options of this DateTimeFormat object.

Intl.DateTimeFormat.prototype.formatRange()

This method receives two Dates and formats the date range in the most concise way based on the locale and options provided when instantiating DateTimeFormat.

Intl.DateTimeFormat.prototype.formatRangeToParts()

This method receives two Dates and returns an Array of objects containing the locale-specific tokens representing each part of the formatted date range.

Intl.DateTimeFormat.prototype.formatToParts()

Returns an Array of objects representing the date string in parts that can be used for custom locale-aware formatting.

Intl.DateTimeFormat.prototype.resolvedOptions()

Returns a new object with properties reflecting the locale and formatting options computed during initialization of the object.

Examples

Using DateTimeFormat

In basic use without specifying a locale, DateTimeFormat uses the default locale and default options.

js
const date = new Date(Date.UTC(2012, 11, 20, 3, 0, 0));

// toLocaleString without arguments depends on the implementation,
// the default locale, and the default time zone
console.log(new Intl.DateTimeFormat().format(date));
// "12/19/2012" if run with en-US locale (language) and time zone America/Los_Angeles (UTC-0800)

Using locales

This example shows some of the variations in localized date and time formats. In order to get the format of the language used in the user interface of your application, make sure to specify that language (and possibly some fallback languages) using the locales argument:

js
const date = new Date(Date.UTC(2012, 11, 20, 3, 0, 0));

// Results below use the time zone of America/Los_Angeles (UTC-0800, Pacific Standard Time)

// US English uses month-day-year order
console.log(new Intl.DateTimeFormat("en-US").format(date));
// "12/19/2012"

// British English uses day-month-year order
console.log(new Intl.DateTimeFormat("en-GB").format(date));
// "19/12/2012"

// Korean uses year-month-day order
console.log(new Intl.DateTimeFormat("ko-KR").format(date));
// "2012. 12. 19."

// Arabic in most Arabic speaking countries uses real Arabic digits
console.log(new Intl.DateTimeFormat("ar-EG").format(date));
// "١٩‏/١٢‏/٢٠١٢"

// for Japanese, applications may want to use the Japanese calendar,
// where 2012 was the year 24 of the Heisei era
console.log(new Intl.DateTimeFormat("ja-JP-u-ca-japanese").format(date));
// "24/12/19"

// when requesting a language that may not be supported, such as
// Balinese, include a fallback language, in this case Indonesian
console.log(new Intl.DateTimeFormat(["ban", "id"]).format(date));
// "19/12/2012"

Using options

The date and time formats can be customized using the options argument:

js
const date = new Date(Date.UTC(2012, 11, 20, 3, 0, 0, 200));

// request a weekday along with a long date
let options = {
  weekday: "long",
  year: "numeric",
  month: "long",
  day: "numeric",
};
console.log(new Intl.DateTimeFormat("de-DE", options).format(date));
// "Donnerstag, 20. Dezember 2012"

// an application may want to use UTC and make that visible
options.timeZone = "UTC";
options.timeZoneName = "short";
console.log(new Intl.DateTimeFormat("en-US", options).format(date));
// "Thursday, December 20, 2012, GMT"

// sometimes you want to be more precise
options = {
  hour: "numeric",
  minute: "numeric",
  second: "numeric",
  timeZone: "Australia/Sydney",
  timeZoneName: "short",
};
console.log(new Intl.DateTimeFormat("en-AU", options).format(date));
// "2:00:00 pm AEDT"

// sometimes you want to be very precise
options.fractionalSecondDigits = 3; //number digits for fraction-of-seconds
console.log(new Intl.DateTimeFormat("en-AU", options).format(date));
// "2:00:00.200 pm AEDT"

// sometimes even the US needs 24-hour time
options = {
  year: "numeric",
  month: "numeric",
  day: "numeric",
  hour: "numeric",
  minute: "numeric",
  second: "numeric",
  hour12: false,
  timeZone: "America/Los_Angeles",
};
console.log(new Intl.DateTimeFormat("en-US", options).format(date));
// "12/19/2012, 19:00:00"

// to specify options but use the browser's default locale, use undefined
console.log(new Intl.DateTimeFormat(undefined, options).format(date));
// "12/19/2012, 19:00:00"

// sometimes it's helpful to include the period of the day
options = { hour: "numeric", dayPeriod: "short" };
console.log(new Intl.DateTimeFormat("en-US", options).format(date));
// 10 at night

The used calendar and numbering formats can also be set independently via options arguments:

js
const options = { calendar: "chinese", numberingSystem: "arab" };
const dateFormat = new Intl.DateTimeFormat(undefined, options);
const usedOptions = dateFormat.resolvedOptions();

console.log(usedOptions.calendar);
// "chinese"

console.log(usedOptions.numberingSystem);
// "arab"

console.log(usedOptions.timeZone);
// "America/New_York" (the users default timezone)

Specifications

Specification
ECMAScript® 2025 Internationalization API Specification
# datetimeformat-objects

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
DateTimeFormat
DateTimeFormat() constructor
Supports normative optional ChainDateTimeFormat behavior
locales parameter
options parameter
options.calendar parameter
options.dateStyle parameter
options.dayPeriod parameter
options.fractionalSecondDigits parameter
options.hourCycle parameter
options.numberingSystem parameter
options.timeStyle parameter
options.timeZoneName parameter
shortGeneric/longGeneric/shortOffset/longOffset as options.timeZoneName option
options.timeZone parameter
IANA time zone names in options.timeZone option
format
formatRange
formatRangeToParts
formatToParts
resolvedOptions
computed timeZone
supportedLocalesOf

Legend

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Full support
Full support
Partial support
Partial support
No support
No support
See implementation notes.
Has more compatibility info.

See also