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Full Discussion: DST Change For Australia
Top Forums Shell Programming and Scripting DST Change For Australia Post 302116627 by jim mcnamara on Monday 7th of May 2007 07:39:23 AM
Old 05-07-2007
/usr/share/lib/zoneinfo/Australia/<timezone name>

Can you find a NSW file in the zoneinfo directory? It sounds like it is not there. Or maybe it has some issues, possibly protection.

Plus, DO NOT set time back and forth like that, you can cause cron jobs to do unexpected things. And mess up nightly processing.

UNIX time is kept in seconds since Jan 1 1970. Daylight time changes do not change that count. Changing the date does. The system uses files in /usr/share/lib/zoneinfo/Australia/.... to display the time based on UTC calculated from the number of seconds.

You should set the date (in seconds) to match UTC, whatever that may be.
However use date -a to do that, it is less likely to screw up batch jobs.

You can manually set the timezone using the results of tzselect. It asks questions. tzdump should let you see what /usr/share/lib/zoneinfo/Australia/NSW thinks about DST, if the file is okay.

Last edited by jim mcnamara; 05-07-2007 at 09:01 AM..
 

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DateTime::Format::DateParse(3pm)			User Contributed Perl Documentation			  DateTime::Format::DateParse(3pm)

NAME
DateTime::Format::DateParse - Parses Date::Parse compatible formats SYNOPSIS
use DateTime::Format::DateParse; my $dt = DateTime::Format::DateParse->parse_datetime( $date ); my $dt = DateTime::Format::DateParse->parse_datetime( $date, $zone ); DESCRIPTION
This module is a compatibility wrapper around Date::Parse. USAGE
Import Parameters This module accepts no arguments to it's "import" method and exports no symbols. Methods Class Methods o parse_datetime($date [, $zone]) Accepts a Date::Parse compatible $date string and optionally a Time::Zone compatible $zone string. Returns a DateTime object. GOTCHAS
o If parse_datetime is called on a $date that doesn't know specify a timezone and $zone is not set, then the timezone of the returned DateTime object will be set to the "local" timezone. This is consistent with the behavior of Date::Parse. o If parse_datetime is called without a $zone but the $date string does specify a timezone/offset or if parse_datetime is called with a $zone that DateTime::TimeZone does not understand, the returned DateTime object will have it's timezone set to a fixed offset from UTC. This means that "DST" information is not available and date math will not reflect "DST" transitions. This may be resolved for true timezones by using the DateTime::TimeZone::Alias module to "alias" the Time::Zone timezone to an Olson DB name. This may be done automatically in a future release. CREDITS
Graham Barr (GBARR) <gbarr@pobox.com>, author of Date::Parse Everyone at the DateTime "Asylum". SUPPORT
Support for this module is provided via the <datetime@perl.org> email list. See <http://lists.perl.org/> for more details. AUTHOR
Joshua Hoblitt (JHOBLITT) <jhoblitt@cpan.org> COPYRIGHT
Copyright (c) 2005-6 Joshua Hoblitt. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of the licenses can be found in the LICENSE file included with this module, or in perlartistic and perlgpl as supplied with Perl 5.8.1 and later. SEE ALSO
Date::Parse, Time::Zone, DateTime, DateTime::TimeZone, DateTime::TimeZone::Alias, <http://datetime.perl.org/> perl v5.10.1 2010-04-16 DateTime::Format::DateParse(3pm)
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