CLDR 45 Release Note


Unicode CLDR provides key building blocks for software supporting the world's languages. CLDR data is used by all major software systems (including all mobile phones) for their software internationalization and localization, adapting software to the conventions of different languages.

CLDR 45 is a closed release with no submission period, focusing on just a few areas:

Message Format 2.0 (LDML Part 9)

Software needs to construct messages that incorporate various pieces of information. The complexities of the world's languages make this challenging. The goal for MessageFormat 2.0  is to allow developers and translators to create natural-sounding, grammatically-correct, user interfaces that can appear in any language and support the needs of diverse cultures.

The new MessageFormat defines the data model, syntax, processing, and conformance requirements for the next generation of dynamic messages. It is intended for adoption by programming languages, software libraries, and software localization tooling. It enables the integration of internationalization APIs (such as date or number formats), and grammatical matching (such as plurals or genders). It is extensible, allowing software developers to create formatting or message selection logic that add on to the core capabilities. Its data model provides a means of representing existing syntaxes, thus enabling gradual adoption by users of older formatting systems.

Keyboard 3.0 (LDML Part 7)

Keyboard support for digitally disadvantaged languages is often lacking or inconsistent between platforms. The updated LDML Keyboard 3.0 format specifies an interchange format for keyboard data. This will allow keyboard authors to create a single mapping file for their language, which implementations can use to provide that language’s keyboard mapping on their own platform. This format allows both physical and virtual (that is, on-screen or touch) keyboard layouts for a language to be defined in a single file.

Tooling Changes

Many tooling changes are difficult to accommodate in a data-submission release, including performance work and UI improvements. The changes in v45 improve survey tool performance for linguists during data submission and vetting allowing for higher data quality. They are targeted at the v46 submission period, starting in May, 2024.

Data Changes

DTD Changes 

For a full listing, see Delta DTDs.

Supplemental Data Changes

For a full listing, see ¤¤BCP47 Delta and ¤¤Supplemental Delta

For a full listing, see Delta Data

File Changes

The following files were added:

JSON Data Changes


For this release there are no appreciable changes.



Many people have made significant contributions to CLDR and LDML; see the Acknowledgments page for a full listing. 

The Unicode Terms of Use apply to CLDR data; in particular, see Exhibit 1.

For web pages with different views of CLDR data, see