Intl.RelativeTimeFormat.prototype.resolvedOptions()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2020.

The resolvedOptions() method of Intl.RelativeTimeFormat instances returns a new object with properties reflecting the options computed during initialization of this RelativeTimeFormat object.

Try it

const rtf1 = new Intl.RelativeTimeFormat("en", { style: "narrow" });
const options1 = rtf1.resolvedOptions();

const rtf2 = new Intl.RelativeTimeFormat("es", { numeric: "auto" });
const options2 = rtf2.resolvedOptions();

console.log(`${options1.locale}, ${options1.style}, ${options1.numeric}`);
// Expected output: "en, narrow, always"

console.log(`${options2.locale}, ${options2.style}, ${options2.numeric}`);
// Expected output: "es, long, auto"

Syntax

resolvedOptions()

Parameters

None.

Return value

A new object with properties reflecting the options computed during the initialization of this RelativeTimeFormat object. The object has the following properties, in the order they are listed:

locale: The BCP 47 language tag for the locale actually used, determined by the locale negotiation process. Only the nu Unicode extension key, if requested, may be included in the output.
style: The value provided for this property in the options argument, with default filled in as needed. It is either "long", "short", or "narrow". The default is "long".
numeric: The value provided for this property in the options argument, with default filled in as needed. It is either "always" or "auto". The default is "always".
numberingSystem: The value provided for this property in the options argument, or using the Unicode extension key "nu", with default filled in as needed. It is a supported numbering system for this locale. The default is locale dependent.

Examples

Using the resolvedOptions() method

const de = new Intl.RelativeTimeFormat("de-DE");
const usedOptions = de.resolvedOptions();

usedOptions.locale; // "de-DE"
usedOptions.style; // "long"
usedOptions.numeric; // "always"
usedOptions.numberingSystem; // "latn"

Specifications

Specification
ECMAScript® 2026 Internationalization API Specification # sec-intl.relativetimeformat.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`	71	79	65	58	14	71	65	50	14	10.0	71	1.8	12.0.0 Before version 13.0.0, only the locale data for `en-US` is available by default. See the `RelativeTimeFormat()` constructor for more details.