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Date: Tue, 5 Mar 2024 13:37:36 -0800
From: Guy Harris <gharris@...ic.net>
To: Russ Allbery <eagle@...ie.org>
Cc: Rich Felker <dalias@...c.org>, Ian Abbott via tz <tz@...a.org>,
musl@...ts.openwall.com
Subject: Re: [tz] Re: Weird PST8PDT and EST5EDT behavior on Alpine
Linux
On Mar 5, 2024, at 12:56 PM, Russ Allbery via tz <tz@...a.org> wrote:
> but for the record, PST8PDT was for support for very
> old commercial UNIXes where I believe that was the only recognized style
> of TZ setting, and I'm pretty dubious that the POSIX-introduced :PST8PDT
> syntax would work there.
That TZ syntax dates back at least to System III:
http://www.bitsavers.org/pdf/att/unix/System_III/UNIX_Users_Manual_Release_3_Jun80.pdf
(see CTIME(3C)), which did not support anything tzdb-related, and didn't even support the more elaborate POSIX TZ syntax to include rules. At least according to the CTIME(3C) page, System V Release 1 doesn't appear to support the POSIX syntax (or tzdb), and the same is true of SVR2 and SVR3.
Full POSIX support - but not tzdb support, may have shown up in SVR3.2; SVR4 had a tzcode-based implementation and shipped with the tzdb files.
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