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Re: [GENERAL] ISO week dates

From: Peter Eisentraut <peter_e(at)gmx(dot)net>
To: guillaume(at)lelarge(dot)info
Cc: Brendan Jurd <direvus(at)gmail(dot)com>, pgsql-patches(at)postgresql(dot)org
Subject: Re: [GENERAL] ISO week dates
Date: 2006-10-12 17:17:52
Message-ID: 200610121917.53438.peter_e@gmx.net (view raw or flat)
Thread:
Lists: pgsql-generalpgsql-patches
Guillaume Lelarge wrote:
> I've tried to work on the first one, the ISO day field. My patch is
> attached and is against CVS HEAD. It only takes care of the code,
> nothing is done for documentation matter. It works with me :
>
> toto=# select to_char(('2006-10-'||a+2)::date, 'DAY') as "dow",
>    to_char(('2006-10-'||a+2)::date, 'ID') as "ID field",
>    to_char(('2006-10-'||a+2)::date, 'D') as "D field"
>    from generate_series(1, 15) as a;

There is an inconsistency here:  'IYYY' is the four-digit ISO year, 'IW' 
is the two-digit ISO week, but 'ID' would be the one-digit ISO 
day-of-the-week.  I'm not sure we can fix that, but I wanted to point 
it out.

We should also support a format for ISO day-of-the-year, which might 
be 'IDDD'.

-- 
Peter Eisentraut
http://developer.postgresql.org/~petere/

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