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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 (view raw or flat)
Thread:
Lists: pgsql-hackers
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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