icu.unicode.orgICU - International Components for Unicode

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Unicode® ICU on GitHub Downloading ICU ICU 75 ICU 74 ICU 73 ICU 72 ICU 71 ICU 70 ICU 69 ICU Time Zone Update Utility (ICUTZU) Verifying Downloads Old ICU Releases Download ICU 4.6 M1 (Superseded by 4.6) Download ICU 4.6 M2 (Superseded by 4.6) Download ICU 4.6 RC2 (Superseded by 4.6) Download ICU 4.6 Release Download ICU 4.8 M1 (Superseded by 4.8) Download ICU 49 Download ICU 49 M2 (Superseded by 49) Download ICU 50 Download ICU 51 Download ICU 52 Download ICU 52 Milestone 1 (Superseded by 52) Download ICU 53 Download ICU 53 Milestone 1 Download ICU 54 Download ICU 55 Download ICU 56 Download ICU 57 Download ICU 58 Download ICU 59 Download ICU 60 Download ICU 61 Download ICU 62 Download ICU 63 Download ICU 64 Download the ICU 4.8 Release ICU 3.2 Archive ICU 3.4 Archive ICU 3.6 Archive ICU 3.8 Archive ICU 4.0 Archive ICU 4.2 Archive ICU 4.4 Archive ICU 54 Milestone 1 ICU 55 Milestone 1 ICU 56 Milestone 1 ICU 65 ICU 66 ICU 67 ICU 68 Milestone User Guide ICU4C Readme ICU4J Readme ICU4C APIs ICU4J APIs DocsPapers gdocs-test-1 Contacts and Mailing Lists Submitting ICU Bugs and Feature Requests Time Zone Database Source Code Access git for ICU Developers (moved) Manually Landing PRs Tips (for developers) Linux Tips Related ICU Projects ICU Charts Character Set Mapping Tables Collation: ICU4C (4.8) vs. GLIBC (2.13-1) Collation: ICU4C 3.8 vs. glibc-2.12.3-2 Collation: ICU4J (53.1) vs Java 7 Feature Comparison Chart UTF16 API Comparison ICU4C Footprint Security Information We have moved ICU Technical Committee Former Project Management Committee Meeting Minutes Design Docs Alphabetic Index BreakIterator Character Iterators Dictionary with Word Frequencies RBBI Rule Enhancements C++ C++ string class Shared Objects Smart Pointers Stack Arrays Calendar issues Backwards era-0 years and add,roll Canonically Equivalent Shortest Form Case Mappings Greek Uppercasing CLDR Support Cleanup MessageFormat Redesign Collation Collation v2 code Collation v2 Performance ICU 53 collation v2 work log prefixes ICU 4.6 Changes Script Reordering test Special Byte Values UCA 6.0 Tests UCA Weight Allocation Compact Encodings Compact Encoding of Names Data Formats Resource Bundle Format v2 Data Structures (moved) ICU Code Point Tries (moved) ICU String Tries BytesTrie UCharsTrie Formatting MeasureFormat Updating Measure Unit with new CLDR data MessageFormat Message Formatting Redesign MessageFormat 2011q1 MessagePattern Demo QuestionsDecisions New Syntax Numbers Decimal Format construction performance Number format skeleton support NumberFormat v2 SelectFormat TimeZone getDisplayName Proposal 20070719 getOffset Chat about edge cases 20070719 Discussion 20071030: getOffset for ambiguous time range ICU 4.8 Time Zone Names Timezone Data Loading ICU4J Development Environment Setup - *OBSOLETE* Java 7 Support Java Logger Joint Tests with CLDR Layout Java Layout Tools Locale Canonicalization Root locale and fallback Normalization Custom Normalization (moved) Norwegian locales changes in v39 Number Parsing ICU4J Number Parsing Problems Number Parsing in ICU4J 61 Properties Preparsed UCD (moved) Regular Expressions Named Capture Groups Regular Expressions, UText based operation Representation of alternate data values in ICU Resource Bundles Clean-Sheet API Flat CLDR Locale Data RB design discussion - 2009-08-21 Resource Bundle Issues Size Reduction Caching CLDR Data Collation Resource Bundles Core Breakup General-Purpose Compression ICU4J Modularization Resource Bundle Keys Resource Bundle Strings Timezone debloating Transliteration Resource Bundles Strings Splitter Synchronization Build Time User Provided Synchronization Double-Checked Locking One Time Initialization Territory Containment TerritoryRegion APIs Transforms UnicodeSet Redesign Unified Cache Setup C/C++ Debugging Eclipse Setup for ICU4J UsersNews 2024-04-17: ICU 75 is now available. It updates to CLDR 45 ( beta blog ) locale data with new locales and various additions and corrections. C++ code now requires C++17 and is being made more robust. The CLDR MessageFormat 2.0 specification is now in technology preview , together with a corresponding update of the ICU4J (Java) tech preview and a new ICU4C (C++) tech preview. See Downloading ICUICU 75 . 2023-12-13: ICU 74.2 released with date/time formatting bug fixes. See Downloading ICUICU 74 . 2023-10-31: ICU 74 is now available. I t updates to Unicode 15.1 , including new characters, emoji, security mechanisms, and corresponding APIs and implementations. It also updates to CLDR 44 ( blog ) locale data with new locales and various additions and corrections. See Downloading ICUICU 74 . What is ICU? ICU is a mature, widely used set of C/C++ and Java libraries providing Unicode and Globalization support for software applications. ICU is widely portable and gives applications the same results on all platforms and between C/C++ and Java software. ICU is released under a nonrestrictive open source license that is suitable for use with both commercial software and with other open source or free software. Here are a few highlights of the services provided by ICU: Code Page Conversion: Convert text data to or from Unicode and nearly any other character set or encoding. ICU's conversion tables are based on charset data collected by IBM over the course of many decades, and is the most complete available anywhere. Collation: Compare strings according to the conventions and standards of a particular language, region or country. ICU's collation is based on the Unicode Collation Algorithm plus locale-specific comparison rules from the Common Locale Data Repository , a comprehensive source for this type of data. Formatting: Format numbers, dates, times and currency amounts according the conventions of a chosen locale. This includes translating month and day names into the selected language, choosing appropriate abbreviations, ordering fields correctly, etc. This data also comes from the Common Locale Data Repository. Time Calculations: Multiple types of calendars are provided beyond the traditional Gregorian calendar. A thorough set of timezone calculation APIs are provided. Unicode Support: ICU closely tracks the Unicode standard, providing easy access to all of the many Unicode character properties, Unicode Normalization, Case Folding and other fundamental operations as specified by the Unicode Standard . Regular Expression: ICU's regular expressions fully support Unicode while providing very competitive performance. Bidi: support for handling text containing a mixture of left to right (English) and right to left (Arabic...