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

The Intl.DateTimeFormat.prototype.resolvedOptions() method returns a new object with properties reflecting the locale and date and time formatting options computed during initialization of this DateTimeFormat object.

Syntax

dateTimeFormat.resolvedOptions()

Return value

A new object with properties reflecting the locale and date and time formatting options computed during the initialization of the given DateTimeFormat object.

Description

The resulting object has the following properties:

locale: The BCP 47 language tag for the locale actually used. If any Unicode extension values were requested in the input BCP 47 language tag that led to this locale, the key-value pairs that were requested and are supported for this locale are included in locale.
calendar: E.g. "gregory"
numberingSystem: The values requested using the Unicode extension keys "ca" and "nu" or filled in as default values.
timeZone: The value provided for this property in the options argument; undefined (representing the runtime's default time zone) if none was provided. Warning: Applications should not rely on undefined being returned, as future versions may return a String value identifying the runtime’s default time zone instead.
hour12: The value provided for this property in the options argument or filled in as a default.
weekday

era
year
month
day
hour
minute
second
timeZoneName

The values resulting from format matching between the corresponding properties in the options argument and the available combinations and representations for date-time formatting in the selected locale. Some of these properties may not be present, indicating that the corresponding components will not be represented in formatted output.

Examples

Using the resolvedOptions method

var germanFakeRegion = new Intl.DateTimeFormat('de-XX', { timeZone: 'UTC' });
var usedOptions = germanFakeRegion.resolvedOptions();

usedOptions.locale;          // "de"
usedOptions.calendar;        // "gregory"
usedOptions.numberingSystem; // "latn"
usedOptions.timeZone;        // "UTC"
usedOptions.month;           // "numeric"

Specifications

Specification

ECMAScript Internationalization API (ECMA-402)The definition of 'Intl.DateTimeFormat.prototype.resolvedOptions' 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
`resolvedOptions`	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.
computed `timeZone`	Chrome Full support 35	Edge Full support 14	Firefox Full support 53	IE No support No	Opera Full support 30	Safari Full support 10	WebView Android Full support ≤37	Chrome Android Full support 35	Firefox Android Full support 56	Opera Android Full support 22	Safari iOS Full support 10	Samsung Internet Android Full support 3.0	nodejs Full support 8.10.0

Legend

Full support: Full support
No support: No support
See implementation notes.': See implementation notes.