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ICU is the premier library for software internationalization, used by a wide array of companies and organizations.

Release Overview

The features for this release include support of CLDR 29 and Unicode 8.0 with grapheme/word/line breaking improved for Emoji sequences.

For more details, including migration issues, see below.

List of tickets fixed in ICU 57

Common Changes

  • CLDR 29: For details of the many changes in CLDR, see CLDR 29.
  • Grapheme/word/line breaking for emoji sequences, based on Unicode 9 proposed rules. See the Unicode emoji break proposal and the Unicode Emoji Technical Report Proposed Update describing the new emoji sequences.  (#12081). 
  • Four new Unicode emoji properties (#11802).
  • DateFormat day period formatting of "noon", "at night", etc. via new pattern characters b & B, and DateTimePatternGenerator support of C for selecting the customary form (#11872).
    • Except: Formatting of "0:00 midnight" has been disabled because it is confusing except for at the end of an interval.
  • RelativeDateTimeFormatter: Simpler formatting API (#12072).
  • More robust CLDR data loading for MeasureFormat (#11986, #12030), RelativeDateTimeFormatter (#12018), and DateIntervalFormat/DateIntervalInfo (#12013).
  • New simple & fast SimpleFormatter class for a trivial subset of MessageFormat as used in CLDR data, e.g., "{0} {1}" (#10896).

ICU4C Specific Changes

  • C API support for RelativeDateTimeFormatter (#12072).
  • Clang annotations for intended switch case fallthroughs, can now compile with -Wimplicit-fallthrough (#12166).
  • Internal header files can be compiled by themselves, for simpler alternative build scripts (#12141).

ICU4J Specific Changes

  • The minimum execution environment was updated to Java 6 (#12022)
  • Compact currency format like "1,2 Mio. €" via CompactDecimalFormat (#10910).

Known Issues

  • There is an impact on performance and memory impact for the first use of transliterators in a process, likely due to the number of new transforms added in CLDR 29 (#12380).
  • C:  ICU4C 57.1 does not build with Visual Studio 2015 when using the included project files. See ticket for workaround. (#11822)
  • C: ICU4C 57.1 does not build under IBM i. This should be remedied in ICU 58. (#12701

Migration Issues

  • ICU4J classes are compiled against Java SE 6 runtime and the class file format was changed to Java 6. ICU4J 57 no longer supports JRE 5 or older Java runtime.
  • There are details on migration issues that may result from CLDR changes on CLDR 29 Migration.
  • The ICU license file has been reformatted to plain text and renamed (#12037).

ICU4C Download

Version: 57.1
Release Date: 2016-03-23

(If the list of files does not appear above, see ICU4C Binaries.)

(If the list of files does not appear above, see ICU4C Source.)

To extract the source code, use the following command: svn export

ICU4J Download

Version: 57.1
Release Date: 2016-03-23
(If the list of files does not appear above, see ICU4J files.)

To extract the source code, use the following command: svn export