[tz] Confusing zdump output for America/Ojinaga

[Dave Rolsky]

I'm a bit confused regarding the output from zdump for the new
America/Ojinaga zone. Here's the output for 2022:

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 03:00:00 2022 CDT
isdst=1 gmtoff=-18000
America/Ojinaga  Sun Nov  6 06:59:59 2022 UT = Sun Nov  6 01:59:59 2022 CDT
isdst=1 gmtoff=-18000
America/Ojinaga  Sun Nov  6 07:00:00 2022 UT = Sun Nov  6 01:00:00 2022 CST
isdst=0 gmtoff=-21600

Note that there's no November 30 event. But 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.

But maybe I'm misunderstanding how to interpret the zone file definition?


Cheers,

Dave Rolsky
http://blog.urth.org
https://github.com/autarch
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