Open Directory Project Globalization and Internationalization
dmoz.org/Computers/Software/Globalization/Internationalization

International Currency, Date, and Time Formats
msdn.microsoft.com/library/books/devintl/S25C7.HTM

International Date Format Campaign
www.saqqara.demon.co.uk/datefmt.htm

The Calendar Zone
www.calendarzone.com

Date and Time Miscellany
www.merlyn.demon.co.uk/miscdate.htm

Oracle National Language Support Guide
(free registration required)
technet.oracle.com/doc/oracle8i_816/server.816/a76966/toc.htm

Oracle 8i SQL Reference (free registration required)
technet.oracle.com/doc/oracle8i_816/server.816/a76989/toc.htm

PostgreSQL User's Guide
www.postgresql.org/docs/user/index.html

Sybase Transact-SQL User's Guide
sybooks.sybase.com/onlinebooks/group-as/asg1200e/asesqlug