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Date: Wed, 15 Mar 2017 15:01:12 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: DST change issue for timezones in southern hemisphere
On Mon, Mar 06, 2017 at 12:44:53PM +0200, JS wrote:
> Hi!
>
> For some reason DST change in southern hemisphere occurs 1 hour late
> when clock is turned backward and 1 hour early when clock is turned
> forward.
>
> For example, timezone for spec for Brazil is:
> BRT3BRST,M10.3.0/0,M2.3.0/0
> Which means that DST change occurs at midnight.
>
> Output of date for both DST changes:
>
> ~# date
> Sun Feb 19 00:59:59 BRST 2017
> ~# date
> Sun Feb 19 00:00:00 BRT 2017
>
> ~# date
> Sat Oct 14 22:59:59 BRT 2017
> ~# date
> Sun Oct 15 00:00:00 BRST 2017
>
> I've tested the same code on same hardware but with uClibc library
> instead of musl and it works fine.
I think this is indeed a bug. Can you confirm that the correct
progressions across DST change should be:
Sat Feb 18 23:59:59 BRST 2017
Sat Feb 18 23:00:00 BRT 2017
Sat Oct 14 23:59:59 BRT 2017
Sun Oct 15 01:00:00 BRST 2017
If so I think I have a working fix (see attached). The logic for
handling DST transition times for southern hemisphere was trying to do
something special that was actually wrong and didn't need to be
special-cased.
Rich
View attachment "southern-hemisphere.diff" of type "text/plain" (618 bytes)
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