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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