tc39/ecma402

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Status, process, and documents for ECMA 402

Stars: 610
Forks: 120
Open beginner issues: 0
Indexed issues: 170
Avg merge: 21h 31m
Merged PRs (30d): 1

Dominant language: HTML
License: No license data
Last GitHub push: Sep 15, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
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170 open issues indexed

Should a default locale be allowed to have a Unicode locale extension sequence? Open

c: locale s: discuss

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma402#1098 · Opened Sep 2, 2026
ECMA-402 should define overriding of %TypedArray%.prototype.toLocaleString Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

tc39/ecma402#1094 · 2 comments · Opened Aug 23, 2026
Harmonize formatting option standarization between Unicode, ECMA, and WHATWG Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

tc39/ecma402#1089 · 1 comment · Opened Jul 9, 2026
Proposal: Intl.Locale.prototype.getExemplars() Open

c: locale Proposal s: comment

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma402#1076 · 9 comments · 1 reaction · Opened Jun 15, 2026
Intl.Locale.prototype.getNumberingSystems() does not return useful info Open

c: numbers s: discuss

tc39/ecma402#1071 · 1 comment · 1 assignee · Opened May 26, 2026
Intl.NumberFormat#formatRange should support identityFallback option Open

c: numbers Proposal s: help wanted

Difficulty 5/5 Over a week Newbie friendliness 45/100

tc39/ecma402#1064 · 4 comments · 1 reaction · Opened May 11, 2026
Intl.PersonNameFormat for locale-sensitive person name formatting? Open

Proposal s: discuss

Difficulty 5/5 Over a week Newbie friendliness 30/100

tc39/ecma402#1061 · 1 comment · Opened May 5, 2026
Dangi year issue Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

tc39/ecma402#1060 · 2 comments · Opened Apr 30, 2026
RegionPreference: Align with UTS 35? Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma402#1058 · 7 comments · Opened Apr 15, 2026
WeekInfoOfLocale: Handle "ca" Unicode extension Open

c: locale Data

tc39/ecma402#1055 · 2 comments · 1 assignee · Opened Apr 13, 2026
TimeZonesOfLocale: Clarify "common use in region" Open

c: locale Data s: help wanted

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma402#1052 · 4 comments · Opened Apr 9, 2026
Quantitative criteria for accepting more unit usages Open

c: numbers new unit s: discuss

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma402#1047 · 3 comments · 2 reactions · Opened Mar 11, 2026
IsWellFormedLanguageTag doesn't match well-formedness from UTS 35 for duplicate ukey or tkey values Open

c: locale s: discuss

Difficulty 5/5 Over a week Newbie friendliness 25/100

tc39/ecma402#1046 · 2 comments · Opened Mar 9, 2026
A need for Intl.DurationFormat.prototype.formatRange Open

Proposal s: discuss

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma402#1045 · 4 comments · Opened Feb 24, 2026
Guarantee that a format returned from DateTimeStyleFormat can also be returned by BasicFormatMatcher/BestFitFormatMatcher Open

c: datetime Data

Difficulty 5/5 Over a week Newbie friendliness 25/100

tc39/ecma402#1043 · 1 comment · Opened Feb 9, 2026
iso8601 as DateTimeFormat calendar Open

c: datetime s: discuss

Difficulty 5/5 Over a week Newbie friendliness 25/100

tc39/ecma402#1036 · 11 comments · Opened Nov 18, 2025
Are "islamic" and "islamic-rgsa" still supported by Intl.DisplayNames? Open

c: enum s: comment

Difficulty 3/5 1-2 days Newbie friendliness 35/100

tc39/ecma402#1042 · 4 comments · Opened Nov 10, 2025
Intl.NumberFormat and Intl.PluralRules don't agree when to call SetNumberFormatDigitOptions Open

c: spec s: discuss

Difficulty 4/5 3-5 days Newbie friendliness 35/100

tc39/ecma402#1034 · 1 comment · Opened Nov 6, 2025
Support returning region display names with article as needed Open

c: enum

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma402#1030 · 3 comments · Opened Oct 15, 2025
All Browsers and Node interop on CLDR for Intl formatting Open

c: meta Data s: comment

Difficulty 5/5 Over a week Newbie friendliness 25/100

tc39/ecma402#1028 · 3 comments · Opened Sep 17, 2025
Revisiting limits on Intl Mathematical Value Open

c: numbers s: discuss

Difficulty 5/5 Over a week Newbie friendliness 25/100

tc39/ecma402#1017 · 3 comments · 1 reaction · Opened Jul 30, 2025
Allow engines to ship data for locales in Accept-Language Open

c: meta Data s: help wanted User Preferences

Difficulty 5/5 Over a week Newbie friendliness 25/100

tc39/ecma402#1010 · 2 comments · Opened Jun 9, 2025
CreatePartsFromList fails to account for the hypothetical reality of 3-item templates admissible by Unicode Open

c: spec Data enhancement s: help wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

tc39/ecma402#1005 · Opened May 25, 2025
Add a variant of `ListFormat#formatToParts` that returns the source objects Open

c: text enhancement s: discuss

Difficulty 5/5 Over a week Newbie friendliness 25/100

tc39/ecma402#1004 · Opened May 25, 2025
Gregorian cutover date Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

tc39/ecma402#1003 · 8 comments · 3 reactions · Opened May 22, 2025
Unicode is planning to deprecate H24. What should browsers do? Open

c: datetime s: discuss User Preferences

Difficulty 5/5 Over a week Newbie friendliness 20/100

tc39/ecma402#1002 · 12 comments · Opened May 19, 2025
Thin space insertion between currency sign and numbers Open

c: numbers s: comment

Difficulty 5/5 Over a week Newbie friendliness 25/100

tc39/ecma402#1000 · 1 comment · Opened May 18, 2025
Expressing regional overrides for a given locale Open

s: comment User Preferences

Difficulty 5/5 Over a week Newbie friendliness 32/100

tc39/ecma402#995 · 3 comments · Opened Apr 21, 2025
Add ability to use the European number format without specifying a country Open

c: numbers s: comment User Preferences

Difficulty 5/5 Over a week Newbie friendliness 30/100

tc39/ecma402#994 · 6 comments · Opened Apr 18, 2025
Consider unshipping `islamic` and `islamic-rgsa` calendars Open

calendar s: discuss

Difficulty 5/5 Over a week Newbie friendliness 25/100

tc39/ecma402#971 · 21 comments · Opened Mar 3, 2025
DurationFormat resolvedOptions() output should always include `fractionalDigits` Open

behavior c: datetime needs consensus normative s: discuss

Difficulty 3/5 1-2 days Newbie friendliness 45/100

tc39/ecma402#964 · 1 reaction · Opened Mar 1, 2025
Operations specific to DateTimeFormat should have names indicating that Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

tc39/ecma402#961 · 1 comment · Opened Feb 18, 2025
Region is validated, but language is not Open

c: locale question

Difficulty 5/5 Over a week Newbie friendliness 20/100

tc39/ecma402#959 · 5 comments · Opened Feb 12, 2025
Topic for discussion: Unifying the measure and decimal proposals Open

c: numbers Proposal s: in progress

Difficulty 5/5 Over a week Newbie friendliness 20/100

tc39/ecma402#952 · 1 comment · Opened Jan 16, 2025
ECMA-402 should stop accepting language subtags with more than 3 letters Open

c: locale s: in progress

tc39/ecma402#951 · 20 comments · 1 assignee · Opened Dec 21, 2024
Section 9.1 AvailableLocales shouldn't require base language if script is present Open

c: meta s: discuss

Difficulty 4/5 3-5 days Newbie friendliness 35/100

tc39/ecma402#947 · 13 comments · 2 reactions · Opened Dec 10, 2024
Ambiguous minimumFractionDigits resolution Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

tc39/ecma402#946 · 3 comments · Opened Dec 9, 2024
`%IntlSegmentsPrototype%.values()` Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma402#945 · 3 comments · 2 reactions · Opened Dec 3, 2024
Guidelines for locale-sensitive testing in test262 Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

tc39/ecma402#934 · 2 comments · 2 reactions · Opened Oct 24, 2024
DurationFormat should support literal formats when available Open

c: durationformat Proposal s: comment

Difficulty 5/5 Over a week Newbie friendliness 25/100

tc39/ecma402#979 · 1 comment · Opened Oct 7, 2024
Lunar Month support in Intl.DateTimeFormat() Open

Difficulty 5/5 Over a week Newbie friendliness 28/100

tc39/ecma402#962 · 2 comments · Opened Oct 4, 2024
ECMAScript Proposal: Optional ICU Compatibility for Intl API Open

c: meta s: comment

Difficulty 5/5 Over a week Newbie friendliness 25/100

tc39/ecma402#913 · 4 comments · 5 reactions · Opened Jul 31, 2024
Add support for -u extension 'rg' Open

c: meta s: comment User Preferences

Difficulty 5/5 Over a week Newbie friendliness 25/100

tc39/ecma402#950 · 5 comments · Opened Jul 18, 2024
Design for currency and unit inputs that carry their values Open

c: meta Proposal s: in progress

tc39/ecma402#911 · 5 comments · 3 assignees · Opened Jul 18, 2024
toLocaleLowerCase/toLocaleUpperCase should better align with the rest of ECMA-402 Open

behavior c: text normative Small

tc39/ecma402#896 · 2 comments · 1 assignee · Opened Jun 4, 2024
Consider relaxing locale resolution for `Intl.Segmenter` Open

c: meta s: blocked

tc39/ecma402#895 · 6 comments · 1 assignee · Opened Jun 1, 2024
support `compactDisplay: 'long'` in currency formatting Open

c: numbers s: comment

Difficulty 5/5 Over a week Newbie friendliness 30/100

tc39/ecma402#892 · 6 comments · Opened May 16, 2024
Preferred DateTimeFormat invocation to get YYYY-MM-DD formatting Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

tc39/ecma402#891 · 9 comments · 6 reactions · Opened May 15, 2024
Should "und" behave like "root" or undefined? Open

c: meta Data s: discuss

Difficulty 5/5 Over a week Newbie friendliness 25/100

tc39/ecma402#885 · 14 comments · Opened Apr 30, 2024
List of ISO country codes Open

c: locale s: discuss

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma402#874 · 2 comments · 6 reactions · Opened Mar 7, 2024

tc39/ecma402

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