[tz] Confusing zdump output for America/Ojinaga

Paul Eggert eggert at cs.ucla.edu
Wed Dec 14 14:24:42 UTC 2022

On 12/13/22 21:23, 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.

Very weird, since old zdump should work with new tzdata, within reason. 
And I don't observe the problem on an Ubuntu 20.04.5 LTS x86-64 host 
with current patches that include tzdata 2022g (see transcript below). 
So I suspect you have a corrupted copy of America/Ojinaga, or something 
like that. I am attaching my system's copy which you should be able to 
test by using its absolute file name, e.g., by running "zdump -V -c 
2022,2023 /tmp/Ojinaga" if you save it into /tmp.

$ grep VERSION= /etc/os-release
VERSION="20.04.5 LTS (Focal Fossa)"
$ dpkg-query -l tzdata | grep tzdata
ii  tzdata         2022g-0ubuntu0.20.04.1 all          time zone and 
daylight-saving time data
$ ls -l /usr/share/zoneinfo/America/Ojinaga
-rw-r--r-- 1 root root 1524 Dec  1 04:54 /usr/share/zoneinfo/America/Ojinaga
$ zdump --version
zdump (Ubuntu GLIBC 2.31-0ubuntu9.9) 2.31
$ 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
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