Intent to ship Intl.DateTimeFormat.protoytpe.formatToParts

[Jungshik Shin (신정식, 申政湜)]

Contact emails js...@chromium.org Spec https://github.com/tc39/ecma402/files/41759/formatToParts.pdf Summary Intl.DateTimeFormat.prototype.formatToParts() is scheduled to be added to the EcmaScript Internationalization API specification (Ecma 402). It adds a method to format date and time to a list of tokens and their type (e.g. literal, day, year, month, hour, minute, era, etc). It's implemented and shipped by Firefox. v8 implemented it behind a flag.

Motivation Formatting different parts of a DateTime string in different styles (font weight, size, color, etc) is not possible currently because DateTimeFormat does not offer a way to access individual parts of formatted DateTime. This API gives back a list of token types and their offsets making it possible to style different parts differently in an i18n-aware manner. See https://github.com/tc39/ecma402/issues/30  Interoperability risk Firefox: Shipped Edge: No public signals Safari: No public signals Web developers: No signals

spec discussion: https://github.com/tc39/ecma402/issues/30 

polyfill: https://github.com/andyearnshaw/Intl.js/blob/master/src/12.datetimeformat.js

Compatibility risk None. This is a new API. Ongoing technical constraints None Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)? Yes or no. Yes OWP launch tracking bug https://bugs.chromium.org/p/v8/issues/detail?id=5244 Link to entry on the Chrome Platform Status https://www.chromestatus.com/features/6319456309477376 Requesting approval to ship? Yes

[Jungshik Shin (신정식, 申政湜)]

Cross-posting to v8-dev@

Contact emails
js...@chromium.org
Spec

https://github.com/tc39/ecma402/files/41759/formatToParts.pdf

Summary

Intl.DateTimeFormat.prototype.formatToParts() is scheduled to be added to the EcmaScript Internationalization API specification (Ecma 402).
It adds a method to format date and time to a list of tokens and their type (e.g. literal, day, year, month, hour, minute, era, etc).

It's implemented and shipped by Firefox. v8 implemented it behind a flag.

Motivation

Formatting different parts of a DateTime string in different styles (font weight, size, color, etc) is not possible currently because DateTimeFormat does not offer a way to access individual parts of formatted DateTime. This API gives back a list of token types and their offsets making it possible to style different parts differently in an i18n-aware manner. See https://github.com/tc39/ecma402/issues/30 
Interoperability risk

Firefox: Shipped

Safari: No public signals
Web developers: No signals

Edge: No public signals

[Daniel Ehrenberg]

LGTM

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[Adam Klein]

LGTM2

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