The DateTime::TimeZone modules provide a Perl interface to the Olson
time zone database. Rather than using the database directly, we parse
the database files and turn them into a set of modules, one for each
time zone defined. This allows for various optimizations in doing
time zone calculations. This conversion is done with the script in
tools/parse_olson.
The Olson time zone database is the best available source for world
wide time zone information. It is available from
ftp://elsie.nci.nih.gov/pub/. A good starting point for information
on the database, and time zones in general, is
http://www.twinsun.com/tz/tz-link.htm.
