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"numberingSystem" option for Intl.NumberFormat / "calendar" and "numberingSystem" option for Intl.DateTimeFormat

Category

JavaScript

Type

New or changed feature

Status

Enabled by default (Chrome 80)

Intent stage

Start prototyping

• Breaking change: No
• Enterprise impact: None
• Spec maturity: Incubation
• Web Platform Tests: Yes

WPT details: Tests will be added to test262 before launching

Summary

Allows the calendar and numbering system to be specified in the options object of the DateTimeFormat() and NumberFormat() constructors.

Motivation

A use case for these options are locals with two numbering systems or calendars. The user agent default may be the non-Western one, but in some contexts Western systems are more appropriate. Currently, applications need to parse the BCP 47 language tag. This feature makes it simpler for the developer.

Standards & signals

• Specification: https://github.com/tc39/ecma402/pull/175
• Firefox: No signal
• Safari: No signal
• Web developers: No signals
• Tracking bug: https://bugs.chromium.org/p/v8/issues/detail?id=9154

Ecosystem

• Web Platform Tests: https://wpt.fyi/results/?q=numberingsystem-option-for-intl-numberformat-calendar-and-numberingsystem-option-for-intl-datetimeformat
• Chrome Platform Showcase: https://chrome-platform-showcase.paulkinlan-ea.deno.net/features
• GenDN reference: https://gendn.paulkinlan-ea.deno.net/features
• chrome.dev demos search: https://www.google.com/search?q=site%3Achrome.dev+%22numberingSystem%22%20option%20for%20Intl.NumberFormat%20%2F%20%22calendar%22%20and%20%22numberingSystem%22%20option%20for%20Intl.DateTimeFormat
• MDN Web Docs: https://developer.mozilla.org/en-US/search?q=%22numberingSystem%22%20option%20for%20Intl.NumberFormat%20%2F%20%22calendar%22%20and%20%22numberingSystem%22%20option%20for%20Intl.DateTimeFormat
• Baseline status: https://webstatus.dev/?q=%22numberingSystem%22%20option%20for%20Intl.NumberFormat%20%2F%20%22calendar%22%20and%20%22numberingSystem%22%20option%20for%20Intl.DateTimeFormat

Docs: https://github.com/tc39/ecma402/pull/175

Explainers: https://github.com/tc39/ecma402/pull/175

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