CLDR 40 Release Note

No. Date Rel. Note Data Charts Spec Delta Tickets GitHub Tag Delta DTD
40 2021-MM-DD v40 CLDR40 Charts40 LDML40 Δ40 release-40-m1 ΔDtd40

See Key to Header Links

This version is currently in development. See the latest release.


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 v40, the focus is on:

  • Grammatical features (gender and case) for units of measurement in additional locales*
  • Emoji v14 names and search keywords
  • Ironing out any kinks in the modernized Survey Tool front end.

* Previously there was a trial phase for grammatical features with only 12 locales (da, de, es, fr, hi, it, nl, no, pl, pt, ru, sv) this has expanded by an additional 29 locales (am, ar, bn, ca, cs, el, fi, gu, he, hr, hu, hy, is, kn, lt, lv, ml, mr, nb, pa, ro, si, sk, sl, sr, ta, te, uk, ur). Of remaining locales, many don't require grammatical information for units of measurement (such as English or Japanese), while for others the information remains to be gathered.

Data Changes

DTD Changes 

  • TBD

Locale Changes (Sample Link)

  • TBD

  • TBD

JSON Data Changes


Specification Changes


Chart Changes






Known Issues



      Many people have made significant contributions to CLDR and LDML; see the Acknowledgments page for a full listing. Special thanks to Jan Kučera for his work on the migration to Markdown

      The Unicode Terms of Use apply to CLDR data; in particular, see Exhibit 1.
      For web pages with different views of CLDR data, see