ICU 4.2 Archive
NOTE: This is an archive of a very old ICU release.
Use these links to find the source mentioned below:
Download ICU 4.2 release
ICU is the premier library for software internationalization. ICU 4.2 is a major reference release of ICU, with new features, new APIs, and many bug fixes in data and code.
Major changes in ICU 4.2 include the following:
Locale Data: ICU uses and supports data from Common Locale Data Repository (CLDR) 1.7 , which includes data for 146 languages, 159 territories, 468 locales- 21% more locale data than the previous release.
Number system support and the number keyword.
Number system override in DateFormat
Numerics used by Hebrew Calendar date in Hebrew locale
BCP47 (language tag) / Locale transformation
BCP47 mapping of LDML keywords
Encoding selector: Return a list of charsets that can handle the input text
Simple duration: Implementation of CLDR duration format
Available/Preferred keywords for a locale (Calendar, Collation, and Currency)
StringPrep standard profiles: RFC3491 NAMEPREP, RFC3530 NFS4, RFC3722 iSCSI, RFC3920 NodePrep/ResourcePrep, RFC4011 MIB, RFC4013 SASLprep, RFC4505 trace and RFC4518 LDAPprep
Miscellaneous Arabic shaping enhancements
UTF-8 friendly internal data structure for Unicode data lookup
API to get CLDR version used by ICU
ISCII charset converter updates (added Gurumukhi, other updates)
Performance improvements in Time Zone Name format/parse, and in DateIntervalFormat construction
ICU4C Specific Changes
Unicode spoof (confusable) detection (UTS#39)
ICU4J Specific Changes
LocaleBuilder for building well-formed locales (ICU4J only)
MathContext support for BigDecimal formatting in DecimalFormat
LMBCS charset converter
Updates in ICU 4.2.1
Timezone database version 2009j
Platform Installation Notes
Please be sure to view the readme.html that is included in ICU. Most installation questions can be answered there. The z/OS (OS/390) unpax-icu.sh script is required to unpackage the compressed tar file on z/OS, and the i5/OS (OS/400) unpax-icu.sh script is required to unpackage the compressed file on IBM i.
The ICU4C 4.2 source downloads contains a pre-built .dat data archive with ICU's data rather than the data source files. This is to simplify the build process for the majority of users and to reduce platform porting issues. If you need the data source files for customization, then please download the ICU source code from SubVersion repository. If you need to remove data from ICU's data library, you can also consider using the new icupkg tool to modify the data built into ICU.
Known Issues, Bugs and Patches
IBM i Note: At the time of ICU 4.2.1's release, there were known issues in building on IBM i.
Intel ICC Compiler:
ICU4C 4.2 Issues Fixed in the 126.96.36.199 Release
Renaming disabled on Windows
IBM i build issues
IBM zOS build issues
ICU4C 4.2 Issues Fixed in the 4.2.1 Maintenance Release
Older ICU4C 4.2 Releases
Here are links to the older ICU4C 4.2.x releases.
Platform Installation Notes
Please be sure to view the readme.html that is included in ICU4J. Most installation questions can be answered there.
ICU4J 4.2 Issues Fixed in the 188.8.131.52 Maintenance Release
#7107 Synchronization issue in TimeZone.getDisplayName
#7137 ICU4J SimpleDateForamt takes too much time for initializing DateFormatSymbols
#7140 SimpleDateFormat constructor takes too much time on initializing NumberingSystem
#7169 DateTimePatternGenerator threading problem
#7227 BaseTimeZone#getSimpleTimeZoneRulesNear problem
ICU4J 4.2 Issues Fixed in the 4.2.1 Maintenance Release
Older ICU4J 4.2 Releases
Here are links to the older ICU4J 4.2.x releases.