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Intl.dateTimeFormat

The Intl.DateTimeFormat object is a constructor for objects that enable language-sensitive date and time formatting.

Constructor

Intl.DateTimeFormat()
Creates a new 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 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.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.
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.

Examples

Using DateTimeFormat

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

var 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:

var 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:

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

// request a weekday along with a long date
var 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;
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 'default'
console.log(new Intl.DateTimeFormat('default', 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:

var options = {calendar: 'chinese', numberingSystem: 'arab'};
var dateFormat = new Intl.DateTimeFormat('default', options);
var 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 compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
DateTimeFormat 24 12 29 11 15 10
DateTimeFormat() constructor 24 12 29 11 15 10
format 24 12 29 11 15 10
formatRange 76 No No No No No
formatRangeToParts 76 No No No No No
formatToParts 57
57
Before version 71, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 71 and later use the specification defined dayPeriod. See Chromium bug 865351.
18 51 No 44
44
Before version 58, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 58 and later use the specification defined dayPeriod. See Chromium bug 865351.
11
resolvedOptions 24 12 29 11 15 10
supportedLocalesOf 24 12 29 11 15 10
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
DateTimeFormat 4.4 25 56 14 10 1.5
DateTimeFormat() constructor 4.4 25 56 14 10 1.5
format 4.4 25 56 14 10 1.5
formatRange 76 76 No 54 No No
formatRangeToParts 76 76 No 54 No No
formatToParts 57
57
Before version 71, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 71 and later use the specification defined dayPeriod. See Chromium bug 865351.
57
57
Before version 71, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 71 and later use the specification defined dayPeriod. See Chromium bug 865351.
56 43
43
Before version 50, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 50 and later use the specification defined dayPeriod. See Chromium bug 865351.
11 7.0
7.0
Before version 71, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 71 and later use the specification defined dayPeriod. See Chromium bug 865351.
resolvedOptions 4.4 25 56 14 10 1.5
supportedLocalesOf 4.4 25 56 14 10 1.5
Server
Node.js
DateTimeFormat 0.12
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.
DateTimeFormat() constructor 13.0.0
13.0.0
0.12
Before 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 for versions prior to 13, see Node.js documentation on the --with-intl option and how to provide the data.
format 0.12
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.
formatRange 12.9.0
12.9.0
Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.
formatRangeToParts 12.9.0
12.9.0
Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.
formatToParts 8.0.0
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 Chromium 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 0.12
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.
supportedLocalesOf 13.0.0
13.0.0
0.12
Before version 13.0.0, only the locale data for en-US is available by default. To make full ICU (locale) data available for versions prior to 13, see Node.js documentation on the --with-intl option and how to provide the data.

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat