W3cubDocs

/JavaScript

Intl.DateTimeFormat

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

Try it

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[@@toStringTag]

The initial value of the @@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

Browser compatibility

Desktop Mobile Server
Chrome Edge Firefox Opera Safari Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet WebView Android Deno Node.js
DateTimeFormat 24 12 29 15 10 25 56 14 10 1.5 4.4 1.8 13.0.0
0.12.0Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the DateTimeFormat instance silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
DateTimeFormat 24 12 29 15 10 25 56 14 10 1.5 4.4 1.8
0.12.0Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.
format 24 12 29 15 10 25 56 14 10 1.5 4.4 1.8
0.12.0Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.
formatRange 76 79 91 63 14.1 76 91 54 14.5 12.0 76 1.8
12.9.0Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.
formatRangeToParts 76 79 91 63 14.1 76 91 54 14.5 12.0 76 1.8
12.9.0Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.
formatToParts
57Before version 71, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 71 and later use the specification defined dayPeriod. See bug 865351.
18 51
44Before version 58, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 58 and later use the specification defined dayPeriod. See bug 865351.
11
57Before version 71, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 71 and later use the specification defined dayPeriod. See bug 865351.
56
43Before version 50, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 50 and later use the specification defined dayPeriod. See bug 865351.
11
7.0Before version 71, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 71 and later use the specification defined dayPeriod. See bug 865351.
57Before version 71, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 71 and later use the specification defined dayPeriod. See bug 865351.
1.8
8.0.0["Before version 12.0.0, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 12.0.0 and later use the specification defined dayPeriod. See bug 865351.", "Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details."]
resolvedOptions 24 12 29 15 10 25 56 14 10 1.5 4.4 1.8
0.12.0Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.
supportedLocalesOf 24 12 29 15 10 25 56 14 10 1.5 4.4 1.8 13.0.0
0.12.0Before version 13.0.0, only the locale data for en-US is available by default. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.

See also

© 2005–2023 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat