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Re: Postgresql likes Tuesday...

From: Hannu Krosing <hannu(at)tm(dot)ee>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Rod Taylor <rbt(at)rbt(dot)ca>,PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Postgresql likes Tuesday...
Date: 2002-09-30 20:46:38
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Tue, 2002-10-01 at 03:31, Tom Lane wrote:
> Offhand this seems kinda inconsistent to me --- I'd expect 
> regression=# select extract(week from date '2002-09-30');
>  date_part
> -----------
>         40
> (1 row)
> to produce 39, not 40, on the grounds that the first day of Week 40
> is tomorrow not today.  Alternatively, if today is the first day of
> Week 40 (as EXTRACT(week) seems to think), then ISTM that the to_date
> expression should produce today not tomorrow.
> I notice that 2001-12-31 is considered part of the first week of 2002,
> which is also pretty surprising:

There are at least 3 different ways to start week numbering:

1. from first week with any days in current year

2. from first full week in current year

3. from first week with thursday in current year

perhaps more...

I suspect it depends on locale which should be used.


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