From: Rich Felker <dalias@aerifal.cx>
To: musl@lists.openwall.com
Subject: Re: [PATCHv2] Add support for leap seconds in zoneinfo files
Date: Fri, 6 Dec 2013 01:29:08 -0500 [thread overview]
Message-ID: <20131206062908.GY24286@brightrain.aerifal.cx> (raw)
In-Reply-To: <52A12548.80508@skarnet.org>
On Fri, Dec 06, 2013 at 01:15:52AM +0000, Laurent Bercot wrote:
>
> >Regarding the unfortunate coupling of timezone and leapsecond data
> >into a single file, do the zoneinfo files with leapseconds have their
> >timezone transition times stored in POSIX time or TAI?
>
> TAI-10 (the 10 seconds offset is so it's the same as POSIX time
> before 1972). As I said, it's the only behaviour that makes sense:
> we're counting a number of seconds and we want it to be unambiguous.
> POSIX time would create an ambiguity for the very moment when a leap
> second happens, which defeats the purpose.
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...
> >At the very least they would have some overhead determining that
> >leapseconds aren't in use.
>
> Indeed, one test at executable start. :)
At first use. Definitely not at executable start.
> Do you have any idea what form this test would take, if we're opting
> away from TZ ?
No, I don't know.
Rich
next prev parent reply other threads:[~2013-12-06 6:29 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-26 18:53 [PATCH] " Laurent Bercot
2013-11-26 18:59 ` Laurent Bercot
2013-11-26 23:32 ` Rich Felker
2013-11-27 1:06 ` Rich Felker
2013-11-27 4:10 ` Laurent Bercot
2013-11-27 4:25 ` Rich Felker
2013-11-27 5:53 ` Laurent Bercot
2013-11-27 18:43 ` Szabolcs Nagy
2013-11-27 20:33 ` Laurent Bercot
2013-12-05 1:13 ` [PATCHv2] " Laurent Bercot
2013-12-05 5:18 ` Szabolcs Nagy
2013-12-05 8:58 ` Laurent Bercot
2013-12-05 14:21 ` Szabolcs Nagy
2013-12-05 14:43 ` Rich Felker
2013-12-05 16:31 ` Laurent Bercot
2013-12-05 16:40 ` Rich Felker
2013-12-06 0:36 ` Laurent Bercot
2013-12-06 0:45 ` Rich Felker
2013-12-06 1:15 ` Laurent Bercot
2013-12-06 5:31 ` Szabolcs Nagy
2013-12-06 10:48 ` Laurent Bercot
2013-12-06 11:38 ` Raphael Cohn
2013-12-06 23:29 ` Laurent Bercot
2013-12-07 2:31 ` Rich Felker
2013-12-07 4:02 ` Szabolcs Nagy
2013-12-07 8:52 ` Laurent Bercot
2013-12-06 6:29 ` Rich Felker [this message]
2013-12-06 10:37 ` Laurent Bercot
2013-12-06 12:50 ` Rich Felker
2013-12-06 13:27 ` Szabolcs Nagy
2013-12-06 15:48 ` Rich Felker
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