Thread: BUG #1630: Wrong conversion in to_date() function. See example.
BUG #1630: Wrong conversion in to_date() function. See example.
From
"Ariel E. Carná/Elizabeth Sosa"
Date:
The following bug has been logged online:
Bug reference: 1630
Logged by: Ariel E. Carná/Elizabeth Sosa
Email address: acarna@tarifar.com
PostgreSQL version: 7.3.8/7.4.6
Operating system: SuSE Linux
Description: Wrong conversion in to_date() function. See example.
Details:
Case PgSQL 7.3.8/SuSE Linux 8.2 (i586)
======================================
PROD=# select to_date('2005-02-32', 'YYYY-MM-DD');
to_date
------------
2005-03-04
(1 row)
PROD=# select version();
version
----------------------------------------------------------------------------
-----------------------------
PostgreSQL 7.3.8 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.3
20030226 (prerelease) (SuSE Linux)
(1 row)
Case PgSQL 7.4.6/SuSE Linux 9.2
(i586)======================================
PROD=> select to_date('2005-02-32', 'YYYY-MM-DD');
to_date
------------
04-03-2005
(1 row)
PROD=> select version();
version
----------------------------------------------------------------------------
-----------------
PostgreSQL 7.4.6 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.3.4 (pre
3.3.5 20040809)
(1 row)
On Tue, Apr 26, 2005 at 11:48:12PM +0100, Ariel E. Carná/Elizabeth Sosa wrote:
>
> Case PgSQL 7.3.8/SuSE Linux 8.2 (i586)
> ======================================
> PROD=# select to_date('2005-02-32', 'YYYY-MM-DD');
> to_date
> ------------
> 2005-03-04
> (1 row)
>
> Case PgSQL 7.4.6/SuSE Linux 9.2
> (i586)======================================
> PROD=> select to_date('2005-02-32', 'YYYY-MM-DD');
> to_date
> ------------
> 04-03-2005
> (1 row)
What bug are you reporting? These are the same date displayed in
different formats -- are you familiar with the DateStyle setting?
http://www.postgresql.org/docs/7.3/interactive/datatype-datetime.html#DATATYPE-DATETIME-OUTPUT
http://www.postgresql.org/docs/7.4/interactive/datatype-datetime.html#DATATYPE-DATETIME-OUTPUT
test=> SELECT version();
version
---------------------------------------------------------------------------
PostgreSQL 7.4.7 on sparc-sun-solaris2.9, compiled by GCC gcc (GCC) 3.4.2
(1 row)
test=> SET DateStyle TO 'ISO,MDY';
SET
test=> SELECT to_date('2005-02-32', 'YYYY-MM-DD');
to_date
------------
2005-03-04
(1 row)
test=> SET DateStyle TO 'Postgres,DMY';
SET
test=> SELECT to_date('2005-02-32', 'YYYY-MM-DD');
to_date
------------
04-03-2005
(1 row)
If anything I'd expect 2005-02-32 to be rejected as invalid, but I
don't know the history or rationale behind to_date's behavior.
--
Michael Fuhr
http://www.fuhr.org/~mfuhr/
"Ariel E. Carná/Elizabeth Sosa" <acarna@tarifar.com> writes:
> PROD=# select to_date('2005-02-32', 'YYYY-MM-DD');
> to_date
> ------------
> 2005-03-04
> (1 row)
I'm not convinced that's a bug --- most implementations of the Unix
mktime function will handle out-of-range day numbers like that.
regards, tom lane
Even javascript handles those dates the same way...
On 4/27/05, Tom Lane <tgl@sss.pgh.pa.us> wrote:=20
>=20
> "Ariel E. Carn=C3=A1/Elizabeth Sosa" <acarna@tarifar.com> writes:
> > PROD=3D# select to_date('2005-02-32', 'YYYY-MM-DD');
> > to_date
> > ------------
> > 2005-03-04
> > (1 row)
>=20
> I'm not convinced that's a bug --- most implementations of the Unix
> mktime function will handle out-of-range day numbers like that.
>=20
> regards, tom lane
>=20
> ---------------------------(end of broadcast)---------------------------
> TIP 5: Have you checked our extensive FAQ?
>=20
> http://www.postgresql.org/docs/faq
>
Michael Fuhr <mike@fuhr.org> writes:
> If anything I'd expect 2005-02-32 to be rejected as invalid, but I
> don't know the history or rationale behind to_date's behavior.
It is rejected by the standard date input converter:
regression=# select '2005-02-32'::date;
ERROR: date/time field value out of range: "2005-02-32"
HINT: Perhaps you need a different "datestyle" setting.
However we consider that to_date() exists to be Oracle compatible,
and so I would regard this as a bug if and only if Oracle does
something different with the same input. Anyone know?
regards, tom lane
>
> However we consider that to_date() exists to be
> Oracle compatible,
> and so I would regard this as a bug if and only if
> Oracle does
> something different with the same input. Anyone
> know?
>
Here is the output I get from Oracle:
=====================================================
Connected to:
Oracle8 Enterprise Edition Release 8.0.6.3.0 -
Production
SELECT to_date('2005-02-27', 'YYYY-MM-DD') from dual
TO_DATE('2005-02-27','YYYY-MM-
------------------------------
2/27/2005
1 row selected
SELECT to_date('2005-02-29', 'YYYY-MM-DD') from dual
ORA-01839: date not valid for month specified
SELECT to_date('2005-02-32', 'YYYY-MM-DD') from dual;
ORA-01847: day of month must be between 1 and last day
of month
===========================================
Regards,
Shelby Cain
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With Oracle (at least since 6.x version) this conversion is wrong.
Atentamente ,=20
Ariel Carn=E1
-----Mensaje original-----
De: Tom Lane [mailto:tgl@sss.pgh.pa.us]=20
Enviado el: Mi=E9rcoles, 27 de Abril de 2005 11:54 a.m.
Para: Michael Fuhr
CC: Ariel E. Carn=C3=A1/Elizabeth Sosa; pgsql-bugs@postgresql.org
Asunto: Re: [BUGS] BUG #1630: Wrong conversion in to_date() function. See
example.=20
Michael Fuhr <mike@fuhr.org> writes:
> If anything I'd expect 2005-02-32 to be rejected as invalid, but I
> don't know the history or rationale behind to_date's behavior.
It is rejected by the standard date input converter:
regression=3D# select '2005-02-32'::date;
ERROR: date/time field value out of range: "2005-02-32"
HINT: Perhaps you need a different "datestyle" setting.
However we consider that to_date() exists to be Oracle compatible,
and so I would regard this as a bug if and only if Oracle does
something different with the same input. Anyone know?
regards, tom lane
On Wed, 2005-04-27 at 10:53 -0400, Tom Lane wrote:
> Michael Fuhr <mike@fuhr.org> writes:
> > If anything I'd expect 2005-02-32 to be rejected as invalid, but I
> > don't know the history or rationale behind to_date's behavior.
>
> It is rejected by the standard date input converter:
>
> regression=# select '2005-02-32'::date;
> ERROR: date/time field value out of range: "2005-02-32"
> HINT: Perhaps you need a different "datestyle" setting.
>
> However we consider that to_date() exists to be Oracle compatible,
> and so I would regard this as a bug if and only if Oracle does
> something different with the same input. Anyone know?
It's "almost" bug. And it's in TODO (but it's really long todo..:-( I
think to_date/timestamp() should be more pedantic.
Karel
PS. for volunteers for the work on new generation of to_char/date():
http://people.redhat.com/kzak/libfmt/libfmt-0.2-03262005.tar.gz
--
Karel Zak <zakkr@zf.jcu.cz>