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Intl.DateTimeFormat.prototype.resolvedOptions()

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

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Syntax

resolvedOptions()

Parameters

None.

Return value

A new object with properties reflecting the locale and date and time formatting options computed during the initialization of the given Intl.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; defaults to the runtime's default time zone. Should never be undefined.
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

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

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

Specifications

Specification
ECMAScript Internationalization API Specification # sec-intl.datetimeformat.prototype.resolvedoptions

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
`resolvedOptions`	24	12	29	15	10	25	56	14	10	1.5	4.4	1.8	0.12.0 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`	35	14	53	30	10	35	56	22	10	3.0	37	1.8	8.10.0