ICU - International Components for Unicode

http://www-01.ibm.com/software/globalization/icu
http://bugs.icu-project.org/trac

http://userguide.icu-project.org/formatparse/datetime
http://demo.icu-project.org/icu-bin/locexp/locexp
http://www.localeplanet.com/icu/ko/index.html