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Message-Id: <48EA6B36-2F38-470B-ACD4-D85F92ED0FC7@sonic.net>
Date: Fri, 8 Mar 2024 10:39:34 -0800
From: Guy Harris <gharris@...ic.net>
To: James Cloos <cloos@...loos.com>
Cc: musl@...ts.openwall.com, Time zone mailing list <tz@...a.org>,
Russ Allbery <eagle@...ie.org>, Rich Felker <dalias@...c.org>
Subject: Re: Weird PST8PDT and EST5EDT behavior on Alpine Linux
On Mar 6, 2024, at 7:39 AM, James Cloos <cloos@...loos.com> wrote:
>>>>>> "RA" == Russ Allbery <eagle@...ie.org> writes:
>
> RA> and it's probably time to assume everyone supports the Olson
> RA> identifiers.
>
> Operwrt, at least in general, does not.
I.e., it doesn't provide tzdb files, to save storage space on small embedded devices?
> (Nor does aix, if anyone still cares.)
According to at least one page on IBM's support web site, "The default timezone format for AIX 6.1 and AIX 7 is Olson Time":
https://www.ibm.com/support/pages/managing-time-zone-variable-posix
Is that no longer the case?
> I have a clock (actual hw clock) which uses ntp by way of an embedded
> mips board running a version of openwrt. It lack the ram and storage
> to use tzdb. So I have to use EST5EDT,M3.2.0/2:00:00,M11.1.0/2:00:00
> for the timezone. (The explicit /2:00:00 might be avoidable, but the
> use of self documenting data can be beneficial.)
If the desire here is to allow all users of a system to specify time zones using old-style TZ strings such as EST5EDT rather than either POSIX-style or tzdb-style strings, if the system in question can be used outside of a particular hardwired polity, that'll require some way for time zone rules to be specified.
If the desire here is to allow old-style TZ strings within a given polity - said polity probably being the US - to use old-style TZ strings, that could be done by hardcoding the rules for the US and use them, and, if the US changes the rules, distribute an update to the system.
> (I must say it was a bit anoying that the library kept the original
> definition of EST5EDT et alia rathar than moving with the legislation.
> But only a bit.)
To which library are you referring here?
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