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.IX Title "DateTime::TimeZone::OlsonDB 3"
.TH DateTime::TimeZone::OlsonDB 3 "2007-12-31" "perl v5.8.8" "User Contributed Perl Documentation"
.SH "NAME"
DateTime::TimeZone::OlsonDB \- An object to represent an Olson time zone database
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  none yet
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module parses the Olson database time zone definition files and
creates various objects representing time zone data.
.PP
Each time zone is broken down into several parts.  The first piece is
an observance, which is an offset from \s-1UTC\s0 and an abbreviation.  A
single zone may contain many observances, reflecting historical
changes in that time zone over time.  An observance may also refer to
a set of rules.
.PP
Rules are named, and may apply to many different zones.  For example,
the \*(L"\s-1US\s0\*(R" rules apply to most of the time zones in the \s-1US\s0,
unsurprisingly.  Rules are made of an offset from standard time and a
definition of when that offset changes.  Changes can be a one time
thing, or they can recur at regular times through a span of years.
.PP
Each rule may have an associated letter, which is used to generate an
abbreviated name for the time zone, along with the offset's
abbreviation.  For example, if the offset's abbreviation is \*(L"C%sT\*(R",
and the a rule specifies the letter \*(L"S\*(R", then the abbreviation when
that rule is in effect is \*(L"\s-1CST\s0\*(R".
.SH "USAGE"
.IX Header "USAGE"
Not yet documented.  This stuff is a mess.
.SH "AUTHOR"
.IX Header "AUTHOR"
Dave Rolsky, <autarch@urth.org>
.SH "COPYRIGHT & LICENSE"
.IX Header "COPYRIGHT & LICENSE"
Copyright (c) 2003\-2007 David Rolsky.  All rights reserved.  This
program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
.PP
The full text of the license can be found in the \s-1LICENSE\s0 file included
with this module.