Re: We're not lax enough about maximum time zone offset from UTC

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgreSQL(dot)org, Patric Bechtel <patric(dot)bechtel(at)gmail(dot)com>
Subject: Re: We're not lax enough about maximum time zone offset from UTC
Date: 2012-08-30 20:40:48
Message-ID: 20120830204048.GV8753@momjian.us
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On Wed, May 30, 2012 at 06:10:12PM -0400, Tom Lane wrote:
> Currently, our datetime input code thinks that any UTC offset of more
> than 14:59:59 either way from Greenwich must be a mistake. However,
> after seeing Patric Bechtel's recent bug report, I went trolling in the
> Olson timezone files to see what are the largest offsets used there.
> I found three entries that are further out than that:
>
> # Zone NAME GMTOFF RULES FORMAT [UNTIL]
> Zone Asia/Manila -15:56:00 - LMT 1844 Dec 31
> Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
> Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 18
>
> These are all ancient history of course; it does not appear that any
> zones *currently* use offsets larger than +/- 14 hours, which if memory
> serves is what we considered when we set the existing sanity limit.
>
> However, as pointed out by Patric, if you dump and restore an old
> timestamptz value in one of these zones, it will fail to restore because
> of the sanity check. I think therefore that we'd better enlarge the
> allowed range to 15:59:59 either way.

Any status on this?

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

+ It's impossible for everything to be true. +

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