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Date: Fri, 6 Dec 2013 07:50:55 -0500
From: Rich Felker <>
Subject: Re: [PATCHv2] Add support for leap seconds in zoneinfo files

On Fri, Dec 06, 2013 at 10:37:56AM +0000, Laurent Bercot wrote:
> >The reason I asked is that it means, if you're using TAI-10, you have
> >to have matching zoneinfo files for the daylight time transitions to
> >work correctly. This really complicates the matter of having POSIX/TAI
> >and TZ be separate...
>  Yes, people using TAI-10 should also be using right/ timezones instead of
> posix/ ones. That's why TZ as a test is appealing: it ensures consistency.
> But at that level it's entirely the admin's responsibility to have
> consistent configuration: leap-second-conscious admins won't mind doing
> some extra work to have a setting that pleases them.

The problem with this approach is that an individual user may unset
$TZ or set it to a POSIX-syntax timezone such as "UTC" on a system
where the system clock is using TAI-10. Users generally expect this to
work, and their expectation is justified. Valid scripts might even use
TZ=UTC as part of their functionality.


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