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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.

Try it

Syntax

js 
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

js 
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
0.12.0Before 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

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/resolvedOptions