CLDR 42 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.

In CLDR 42, the focus is on:

Locale Status

CLDR v42 Language Count

Data Changes

There were two areas of focus for this release: the formatting of Personal Names, and the upgrade of Modern to include many more languages.

Locale Changes

File Changes 

JSON Data Changes


Formatting people’s names

Software needs to be able to format people's names, such as John Smith or 宮崎駿. The data is typically drawn from a database, where a name record will have fields for the parts of people’s names, such as a given field with a value of “Maria”, and a surname field value of “Schmidt”. 

There are many complications in dealing with the variety of different ways this needs to be done across languages:

CLDR has added structured patterns that enable implementations to format available name fields for a given language. The formatting for a name can vary according to the available name fields, the language of the name and of the viewer, and various input settings.

The new Person Name formatting data has a tech preview status. The CLDR committee is requesting feedback on the data and structure so that it can be refined and enhanced in the next release. ICU will also be offering a tech preview API in its next release. Other clients of CLDR are recommended to try out the new data and structure, and supply feedback back to the CLDR committee in the next few months.

Specification Changes

The following are the main changes in the specification:


The following chart shows the growth of CLDR locale-specific data over time. It is restricted to data items in /main and /annotations directories, so it does not include the non-locale-specific data. The % values are percent of the current measure of Modern coverage. That level is notched up each release, so previous releases had many locales that were at Modern coverage as assessed at the time of their release. There is one line per year, even though there were multiple releases in most years.

The detailed information on changes between v42 release and v41 are at v42 delta_summary.tsv: look at the TOTAL line for the overall counts of Added/Changed/Deleted. See v42 locale-growth.tsv for the detailed figures behind the chart.

CLDR v42 Growth


Known Issues

Upcoming 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