W3cubDocs

Intl.RelativeTimeFormat.prototype.formatToParts()

The formatToParts() method of Intl.RelativeTimeFormat instances returns an Array of objects representing the relative time format in parts that can be used for custom locale-aware formatting.

Try it

Syntax

formatToParts(value, unit)

Parameters

value: Numeric value to use in the internationalized relative time message.
unit: Unit to use in the relative time internationalized message. Possible values are: "year", "quarter", "month", "week", "day", "hour", "minute", "second". Plural forms are also permitted.

Return value

An Array of objects containing the formatted relative time in parts.

Description

The Intl.RelativeTimeFormat.prototype.formatToParts method is a version of the format method which it returns an array of objects which represent "parts" of the object, separating the formatted number into its constituent parts and separating it from other surrounding text. These objects have two properties: type a NumberFormat formatToParts type, and value, which is the String which is the component of the output. If a "part" came from NumberFormat, it will have a unit property which indicates the unit being formatted; literals which are part of the larger frame will not have this property.

Examples

Using formatToParts

const rtf = new Intl.RelativeTimeFormat("en", { numeric: "auto" });

// Format relative time using the day unit
rtf.formatToParts(-1, "day");
// [{ type: "literal", value: "yesterday"}]

rtf.formatToParts(100, "day");
// [
//   { type: "literal", value: "in " },
//   { type: "integer", value: "100", unit: "day" },
//   { type: "literal", value: " days" }
// ]

Specifications

Specification
ECMAScript Internationalization API Specification # sec-Intl.RelativeTimeFormat.prototype.formatToParts

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
`formatToParts`	71	79	70	58	14	71	79	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.