[DEPRECATED IN FAVOR OF Unified Intl.NumberFormat]

Intl.UnitFormat API Specification [draft]

Status

Withdrawn at the 2026 January plenary meeting, due to deprecation

Implementation Progress

• Polyfill: https://github.com/zbraniecki/IntlUnitFormat

Backpointers

• tc39/ecma402#32
• http://cldr.unicode.org/translation/units

Authors

• Zibi Braniecki (@zbraniecki)

Reviewers

TBD

Informative

This proposal is based on the LDML spec, List Patterns:

Prior Art

Usage

let o = new Intl.UnitFormat("en", {
    type: "duration",
    unit: "hour",
    style: "long" // default style
});
console.log(o.format(15)); // "15 hours"

Render Spec

npm install
npm run build
open index.html