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Implement hanidays spellout rules

C-datetimeComponent: datetime, calendars, time zonesComponent: datetime, calendars, time zones

Status: Open.

#7922 In unicode-org/icu4x;

· Manishearth opened on Apr 28, 2026

·  

Backlog ⟨P4⟩

Refactor calendar constructor roundtrip tests to be per-calendar or use test_all_cals

C-datetimeComponent: datetime, calendars, time zonesComponent: datetime, calendars, time zones

Status: Open.

#7921 In unicode-org/icu4x;

· sffc opened on Apr 28, 2026

·  

Tech Debt Priority ⟨P2⟩

Add conditional lint for impl Writeable for {integer}

blockedA dependency must be resolved before this is actionableA dependency must be resolved before this is actionable

C-metaComponent: Relating to ICU4X as a wholeComponent: Relating to ICU4X as a whole

Status: Open.

#7920 In unicode-org/icu4x;

· sffc opened on Apr 28, 2026

Include icu4x-datagen help text in the README file

C-data-infraComponent: provider, datagen, fallback, adaptersComponent: provider, datagen, fallback, adapters

Status: Open.

#7900 In unicode-org/icu4x;

· sffc opened on Apr 22, 2026

Remove ICU-defined properties

C-unicodeComponent: Props, sets, triesComponent: Props, sets, tries

discussDiscuss at a future ICU4X-SC meetingDiscuss at a future ICU4X-SC meeting

Status: Open.

#7892 In unicode-org/icu4x;

· robertbastian opened on Apr 21, 2026

Consider adding more helper macros like utc_offset!

C-metaComponent: Relating to ICU4X as a wholeComponent: Relating to ICU4X as a whole

discussDiscuss at a future ICU4X-SC meetingDiscuss at a future ICU4X-SC meeting

Status: Open.

#7889 In unicode-org/icu4x;

· sffc opened on Apr 21, 2026

·  

Backlog ⟨P4⟩

Potential quadratic behavior in dictionary segmenter

C-segmentationComponent: SegmentationComponent: Segmentation

Status: Open.

#7888 In unicode-org/icu4x;

· Manishearth opened on Apr 20, 2026

Date::try_new_gregorian should take the era as an argument

C-datetimeComponent: datetime, calendars, time zonesComponent: datetime, calendars, time zones

discussDiscuss at a future ICU4X-SC meetingDiscuss at a future ICU4X-SC meeting

Status: Open.

#7883 In unicode-org/icu4x;

· sffc opened on Apr 17, 2026

·  

ICU4X 3.0

The metazone assignment for 1970-01-01 is used before 1970

C-datetimeComponent: datetime, calendars, time zonesComponent: datetime, calendars, time zones

Status: Open.

#7870 In unicode-org/icu4x;

· robertbastian opened on Apr 14, 2026

Inconsistent naming NoCalendarFormatter vs FixedCalendarDateTimeFormatter

C-datetimeComponent: datetime, calendars, time zonesComponent: datetime, calendars, time zones

Status: Open.

#7869 In unicode-org/icu4x;

· robertbastian opened on Apr 14, 2026

Should LocaleDirectionality::get perform full Add-Likely-Subtags algorithm?

C-localeComponent: Locale identifiers, BCP47Component: Locale identifiers, BCP47

Status: Open.

#7866 In unicode-org/icu4x;

· anba opened on Apr 10, 2026

LocaleExpander::maximize doesn't remove Zzzz script and ZZ region subtags before matching

C-localeComponent: Locale identifiers, BCP47Component: Locale identifiers, BCP47

Status: Open.

#7865 In unicode-org/icu4x;

· anba opened on Apr 10, 2026