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Re: storing TZ along timestamps

From: Jim Nasby <jim(at)nasby(dot)net>
To: Alexey Klyukin <alexk(at)commandprompt(dot)com>
Cc: Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: storing TZ along timestamps
Date: 2011-07-17 20:26:25
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Lists: pgsql-hackers
On Jul 6, 2011, at 9:24 AM, Alexey Klyukin wrote:
> So, I'd think there are 2 reasonable approaches to storing the
> timezone part:
> 1. Store the timezone abbreviation (i.e. 'EST' along w/ the timestamp
> data). 
> 2. Assign OID to each of the timezones and store it w/ the timestamp.
> The first option seem to avoid the necessity of creating a new system
> catalog for timezone information and the burden of updating it,
> because current implementation is already capable of translating
> abbreviations to useful timezone information. The question is, whether
> just a TZ abbreviation is sufficient to uniquely identify the timezone
> and get the offset and DST rules. If it's not sufficient, how
> conflicting TZ short names are handled in the current code (i.e. 'AT
> TIME ZONE ...')?

It's not enough. See the timezone_abbreviations setting.
Jim C. Nasby, Database Architect                   jim(at)nasby(dot)net
512.569.9461 (cell)               

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