CLDR 35 Release Note


Unicode CLDR 35 provides an update to the key building blocks for software supporting the world's languages. CLDR data is used by all major software systems for their software internationalization and localization, adapting software to the conventions of different languages for such common software tasks.

CLDR 35 included a limited Survey Tool data collection phase. The following summarizes the changes in the release.

A dot release, version 35.1 is expected in April, with further changes for Japanese calendar.

For details, see Detailed Specification Changes, Detailed Structure Changes, Detailed Data Changes.

Detailed Specification Changes

Aside from documenting additional structure, there have been important modifications to the following areas of LDML:

Part 1: Core

Part 2: General

Part 4: Dates

For more detailed specification changes, see LDML35 Modifications.

Detailed Structure Changes

No DTD changes, except for the following:

XML metadata

DTDs now have enhanced syntax for valid attribute values

Detailed Data Changes

In addition, the following changes were made. This is not complete: for a full list see the list of bug fixes.


The following chart shows the growth of CLDR data over time. It counts the number of data items in /main and /annotations directories, keyed by locale.

The chart does not include data in the /annotationsDerived, /bcp47, /casing, /collation, /dtd, /keyboards, /properties, /rbnf, /segments, /subdivisions, /supplemental, /transforms, /uca, and /validity directories, which is roughly twice as much appears in the above chart.

The chart includes the latest release for each year. The latest data for 2019 will only be available in October; v35.0 just had a limited Survey Tool data collection phase as described in the Overview.


  1. Plural changes (unlikely to cause migration problems).

    1. Marathi (mr) changed the category for 0 to other.

    2. Cornish (kw) added 3 categories and changed many assignments.

  2. Hindi (hi) changed to English AM/PM strings from translations.

  3. The mapping for deprecated language code “mo” has changed from “ro_MD” to just “ro”.


The v35.1 dot-release is focused on the new Japanese era. It includes the following tickets:

Known Issues


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

Key to Header Links

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

For web pages with different views of CLDR data, see