[tz] Add option to act like global-tz

[Bradley White]

On Tue, Aug 16, 2022 at 5:23 PM Paul Eggert <eggert at cs.ucla.edu> wrote:

> On 8/16/22 00:08, Bradley White wrote:
> > Is the intent that the standard install and the "PACKRATDATA=backzone
> > PACKRATLIST=zone.tab" install should not exhibit any differences for
> 1970+
> > timestamps?
>
> Yes, and you can test this by running something like the following in a
> source directory. The diff command should output nothing. (The test
> takes a while.) I did this sort of test before releasing 2022b.
>
> make clean
> make TOPDIR=$PWD/tza ZFLAGS=-r at 0 install
> ./zdump -i $(awk '/^[^#]/{print $3}' zone1970.tab) >a.tzs
> make clean
> make TOPDIR=$PWD/tzb ZFLAGS=-r at 0 \
>    PACKRATDATA=backzone PACKRATLIST=zone.tab \
>    install
> ./zdump -i $(awk '/^[^#]/{print $3}' zone1970.tab) >b.tzs
> diff a.tzs b.tzs
> rm -r tza tzb a.tzs b.tzs
>

That seems to only consider zones in "zone1970.tab", which, by definition,
are the zones "where civil timestamps have agreed since 1970."

What about examples like ...

$ TZ=<path-to-standard>/Africa/Freetown date -d @1660625107
Tue Aug 16 04:45:07 GMT 2022
$ TZ=<path-to-packrat>/Africa/Freetown date -d @1660625107
Tue Aug 16 05:05:07 +01 2022

and ...

$ TZ=<path-to-standard>/Pacific/Saipan date -d @230659200
Sun Apr 24 03:00:00 GDT 1977
$ TZ=<path-to-packrat>/Pacific/Saipan date -d @230659200
Sun Apr 24 02:00:00 +10 1977

It sure seems like those post-1970 timestamps are receiving different
treatments (abbreviations notwithstanding).
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