Issues

• Intl.NumberFormat: which locale pattern to use for currencyDisplay: "code"

  tc39/ecma402#1105 · Filter by author younies opened on Sep 30, 2026
  1

• How should JS handle un-deprecation of EST5EDT, CST6CDT, MST7MDT, PST8PDT in TZDB 2026d?

  tc39/ecma402#1103 · Filter by author justingrant opened on Sep 23, 2026
  19

• Contradiction in definition of internal slots

  tc39/ecma402#1101 · Filter by author jugglinmike opened on Sep 21, 2026

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

  c: locales: discuss
  tc39/ecma402#1098 · Filter by author gibson042 opened on Sep 2, 2026

• ECMA-402 should define overriding of %TypedArray%.prototype.toLocaleString

  tc39/ecma402#1094 · Filter by author gibson042 opened on Aug 23, 2026
  2

• Harmonize formatting option standarization between Unicode, ECMA, and WHATWG

  tc39/ecma402#1089 · Filter by author aphillips opened on Jul 9, 2026
  1

• Proposal: Intl.Locale.prototype.getExemplars()

  c: localeProposals: comment
  tc39/ecma402#1076 · Filter by author sffc-bot opened on Jun 15, 2026
  9

• Intl.Locale.prototype.getNumberingSystems() does not return useful info

  c: numberss: discuss
  tc39/ecma402#1071 · Filter by author sffc opened on May 26, 2026
  1

  

• Intl.NumberFormat#formatRange should support identityFallback option

  c: numbersProposals: help wanted
  tc39/ecma402#1064 · Filter by author devongovett opened on May 11, 2026 · Nice-to-Have
  4

• Intl.PersonNameFormat for locale-sensitive person name formatting?

  Proposals: discuss
  tc39/ecma402#1061 · Filter by author xfq opened on May 5, 2026
  1

• Dangi year issue

  tc39/ecma402#1060 · Filter by author FrankYFTang opened on Apr 30, 2026
  2

• RegionPreference: Align with UTS 35?

  tc39/ecma402#1058 · Filter by author anba opened on Apr 15, 2026
  7

• WeekInfoOfLocale: Handle "ca" Unicode extension

  c: localeData
  tc39/ecma402#1055 · Filter by author anba opened on Apr 13, 2026 · Next ECMAScript Release
  2

  

• TimeZonesOfLocale: Clarify "common use in region"

  c: localeDatas: help wanted
  tc39/ecma402#1052 · Filter by author anba opened on Apr 9, 2026 · Next ECMAScript Release
  4

• Quantitative criteria for accepting more unit usages

  c: numbersnew units: discuss
  tc39/ecma402#1047 · Filter by author sffc opened on Mar 11, 2026
  3

• A need for Intl.DurationFormat.prototype.formatRange

  Proposals: discuss
  tc39/ecma402#1045 · Filter by author FrankYFTang opened on Feb 24, 2026
  4

• Guarantee that a format returned from DateTimeStyleFormat can also be returned by BasicFormatMatcher/BestFitFormatMatcher

  c: datetimeData
  tc39/ecma402#1043 · Filter by author ptomato opened on Feb 9, 2026
  1

• iso8601 as DateTimeFormat calendar

  c: datetimes: discuss
  tc39/ecma402#1036 · Filter by author ptomato opened on Nov 18, 2025
  11

• Are "islamic" and "islamic-rgsa" still supported by Intl.DisplayNames?

  c: enums: comment
  tc39/ecma402#1042 · Filter by author anba opened on Nov 10, 2025
  4

• Intl.NumberFormat and Intl.PluralRules don't agree when to call SetNumberFormatDigitOptions

  c: specs: discuss
  tc39/ecma402#1034 · Filter by author anba opened on Nov 6, 2025
  1

• Support returning region display names with article as needed

  c: enum
  tc39/ecma402#1030 · Filter by author lucacasonato opened on Oct 15, 2025
  3

• All Browsers and Node interop on CLDR for Intl formatting

  c: metaDatas: comment
  tc39/ecma402#1028 · Filter by author snowystinger opened on Sep 17, 2025
  3

• Revisiting limits on Intl Mathematical Value

  c: numberss: discuss
  tc39/ecma402#1017 · Filter by author sffc opened on Jul 30, 2025 · Next ECMAScript Release
  3

• Allow engines to ship data for locales in Accept-Language

  c: metaDatas: help wantedUser Preferences
  tc39/ecma402#1010 · Filter by author sffc opened on Jun 9, 2025 · Next ECMAScript Release
  2

• CreatePartsFromList fails to account for the hypothetical reality of 3-item templates admissible by Unicode

  c: specDataenhancements: help wanted
  tc39/ecma402#1005 · Filter by author dead-claudia opened on May 25, 2025 · Next ECMAScript Release