2025 Feb Intl Locale Info API Stage 3 Update

Frank Yung-Fong Tang / 譚永鋒

ftang@google.com

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TC39 Feb 2025 Meeting

Feb 18-22, 2025

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Slide: https://docs.google.com/presentation/d/1wWDYg5BF1wNNAdC6YbBKvRtKS1acyvIP0eLkWCH2c7M

Repo: https://github.com/tc39/proposal-intl-locale-info

Agenda

• Brief introduction
• Seek for consensus of specification change (PR 83)

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Motivation

A proposal to expose Locale information, such as week data (first day of a week, weekend start day, weekend end day, minimum day in the first week), hour cycle used in the locale.

History of this proposal

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• Advanced to Stage 1 in 2020-09 TC39
• Advanced to Stage 2 in 2021-01 TC39
• Advanced to Stage 3 in 2021-04 TC39
• Update in Stage 3 2021-07, 2021-10 TC39 , 2021-12 (order in list), 2022-11 (getters => functions), 2023-01 (+ get- prefix) , 2023-07 (fw / firstDayOfWeek), 2023-09 (fw / firstDayOfWeek), 2023-11 (fw / firstDayOfWeek), 2024-07 (firstDay return number)

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Issue 86 / PR 99

Remove minimalDays from getWeekInfo() from the proposal

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Other Open Issues

• Define fallback behaviour issues/76
• Related to CharacterDirectionOfLocale : 88 , 89 , 90

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Implementation Status

• Browsers
• Chrome/v8: m99
• Safari: v17
• Mozilla: pending
• Polyfill
• bart-krakowski/get-week-info-polyfill

Requesting the Committee

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Consensus for PR 99

Requesting the Community

Firefox Commitment

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