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BUG #4372: TO_DATE with ISO week and day

From: "Kees Westerlaken" <kees(dot)westerlaken(at)valuecare(dot)nl>
To: pgsql-bugs(at)postgresql(dot)org
Subject: BUG #4372: TO_DATE with ISO week and day
Date: 2008-08-22 13:32:51
Message-ID: 200808221332.m7MDWpVt003415@wwwmaster.postgresql.org (view raw or flat)
Thread:
Lists: pgsql-bugs
The following bug has been logged online:

Bug reference:      4372
Logged by:          Kees Westerlaken
Email address:      kees(dot)westerlaken(at)valuecare(dot)nl
PostgreSQL version: 8.3.3
Operating system:   Windows
Description:        TO_DATE with ISO week and day
Details: 

The TO_DATE conversion with ISO week (IW) and ISO day (ID) format accepts
invalid values and sometimes returns wrong result.

select to_date('2008-31-4','IYYY-IW-ID')
results in "2008-07-31", which is correct

The valid values for IW are 1-7, however:
select to_date('2008-31-8','IYYY-IW-ID')
results in "2008-08-04" of which you could argue if it is correct.

However:
select to_date('2008-31-10','IYYY-IW-ID')
results in "2008-07-28", which is not correct

And even worse: if you use the IW and ID format in an older version it
works, but the result is wrong.
select to_date('2008-31-4','IYYY-IW-ID')
in version 8.2.6 results in "2004-07-26", which is wrong.

Responses

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Next:From: Zahid KhanDate: 2008-08-22 14:23:03
Subject: Re: range value problem with double precision [PG 8.3.3]
Previous:From: Bernard SteweDate: 2008-08-22 13:17:55
Subject: Installation Problems

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