On Tue, Dec 3, 2013, at 11:13 PM, Zefram wrote:
> Alfie John wrote:
> >I had a bit of trouble using timezones defined in the Olson etcetera
> >data file.
>
> DT:TZ intentionally doesn't support them.
The --old option to parse_olson shows that is some support for them, it
just doesn't do them correctly.
> It's not aiming to provide
> precisely the semantics of the Olson database, and you'll see they're
> not listed in DT:TZ:Catalog.
Sorry, I've misunderstood the module then. I saw references to the Olson
database in DT::TZ's documentation, I was under the assumption that it
provided Olson timezones. If it doesn't aim to have mappings to all of
the Olson entries is there a reason not to provide mappings with my
patches? AFAICS it's only etcetera with valid zone data that is missing.
> If you want to resolve zone names
> exactly as in the Olson database, use DateTime::TimeZone::Olson (a
> separate distribution). If you want timezones of fixed offset, prefer
> DateTime::TimeZone::OffsetOnly over the Olson Etc/ names.
I unfortunately need exact mappings, so OffsetOnly isn't an option. I've
looked at DateTime::TimeZone::Olson, and it does what I want, but it
looks like there's a bug (POSIX sign flipping which I've fixed in my
patch to DateTime::TimeZone):
#!/usr/bin/perl
use strict;
use warnings;
use DateTime::Format::ISO8601;
use DateTime::TimeZone::Olson qw(olson_tz);
my $dt
= DateTime::Format::ISO8601
->parse_datetime('2013-12-03T23:39:11')
->set_time_zone('UTC');
print "$dt\n";
$dt->set_time_zone(olson_tz("Etc/GMT+10"));
print $dt,"\n";
Expected output:
2013-12-03T23:39:11
2013-12-04T10:39:11
Actual output:
2013-12-03T23:39:11
2013-12-03T13:39:11
Alfie
--
Alfie John
alf...@fastmail.fm
