[tz] Confusing zdump output for America/Ojinaga

[Benjamin Drung]

On Tue, 2022-12-13 at 23:23 -0600, Dave Rolsky via tz wrote:
> Actually, I think the issue was with the version of zdump I was using.
> Apparently it didn't work properly with the latest tz data. This is a
> bit weird since Ubuntu released an update with the 2022g changes, but
> apparently the zdump binary is part of a different package, and it
> hasn't been updated since April, AFAICT.

What Ubuntu version are you on?

> On Mon, Dec 12, 2022 at 2:42 PM Paul Eggert <eggert at cs.ucla.edu>
> wrote:
> > On 12/12/22 09:47, Dave Rolsky via tz wrote:
> > > I'm a bit confused regarding the output from zdump for the new
> > > America/Ojinaga zone. Here's the output for 2022:
> > 
> > I see different output with TZDB 2022g:
> > 
> > $ zdump -V -c 2022,2023 America/Ojinaga
> > America/Ojinaga  Sun Mar 13 08:59:59 2022 UT = Sun Mar 13 01:59:59
> > 2022 
> > MST isdst=0 gmtoff=-25200
> > America/Ojinaga  Sun Mar 13 09:00:00 2022 UT = Sun Mar 13 03:00:00
> > 2022 
> > MDT isdst=1 gmtoff=-21600
> > America/Ojinaga  Sun Oct 30 07:59:59 2022 UT = Sun Oct 30 01:59:59
> > 2022 
> > MDT isdst=1 gmtoff=-21600
> > America/Ojinaga  Sun Oct 30 08:00:00 2022 UT = Sun Oct 30 02:00:00
> > 2022 
> > CST isdst=0 gmtoff=-21600
> > 
> > 
> > > based on the zone's definition
> > > I'd expect to see these events:
> > > 
> > > Oct 30 - change to _CST_
> > > Nov 30 - No change, I guess, since the change to the US rules on
> > > Nov 30
> > > doesn't actually change the offset or isdst flag.
> > 
> > Yes, that's what I'd expect too, and it's what I observed above.
> > 
> > Maybe you have an old Ojinaga somehow?