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Message-ID: <87r0gopc9g.fsf@hope.eyrie.org>
Date: Tue, 05 Mar 2024 14:03:23 -0800
From: Russ Allbery <eagle@...ie.org>
To: Guy Harris <gharris@...ic.net>
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
Guy Harris <gharris@...ic.net> writes:
> 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.
I don't see any reference to the leading colon in that documentation. Am
I just missing something? It seems to support what I said: PST8PDT was
supported, but :PST8PDT was not.
If an environment variable named TZ is present, asctime uses the
contents of the variable to override the default time zone. The value
of TZ must be a three-letter time zone name, followed by a number
representing the difference between local time and Greenwich time in
hours, followed by an optional three-letter name for a daylight time
zone. For example, the setting for New Jersey would be EST5EDT.
--
Russ Allbery (eagle@...ie.org) <https://www.eyrie.org/~eagle/>
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