Intl.RelativeTimeFormat.prototype.format()

The format() method of Intl.RelativeTimeFormat instances formats a value and unit according to the locale and formatting options of this Intl.RelativeTimeFormat object.

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Syntax

js

format(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.

Description

The function returned by the format getter formats a value and a unit into a string according to the locale and formatting options of this Intl.RelativeTimeFormat object.

Examples

Basic format usage

The following example shows how to create a relative time formatter using the English language.

js

// Create a relative time formatter in your locale
// with default values explicitly passed in.
const rtf = new Intl.RelativeTimeFormat("en", {
  localeMatcher: "best fit", // other values: "lookup"
  numeric: "always", // other values: "auto"
  style: "long", // other values: "short" or "narrow"
});

// Format relative time using negative value (-1).
rtf.format(-1, "day"); // "1 day ago"

// Format relative time using positive value (1).
rtf.format(1, "day"); // "in 1 day"

Using the auto option

If numeric:auto option is passed, it will produce the string yesterday, today, or tomorrow instead of 1 day ago, in 0 days, or in 1 day. This allows to not always have to use numeric values in the output.

js

// Create a relative time formatter in your locale
// with numeric: "auto" option value passed in.
const rtf = new Intl.RelativeTimeFormat("en", { numeric: "auto" });

// Format relative time using negative value (-1).
rtf.format(-1, "day"); // "yesterday"

rtf.format(0, "day"); // "today"

// Format relative time using positive day unit (1).
rtf.format(1, "day"); // "tomorrow"

Specifications

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

Browser compatibility

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See also