to_timestamp not stable if date string shorter than template
Architecture: Intel Pentium
Operating System: Redhat 7.2 (Linux 2.4.17)
PostgreSQL version: PostgreSQL-7.3.4
Compiler used: gcc 3.01
to_timestamp appears to pick up the time-of-day from the previous call's
return value if a date string has no time component. For example:
# select to_timestamp('2003-06-01', 'YYYY-MM-DD HH24:MI:SS') ;
to_timestamp
------------------------
2003-06-01 00:00:00-07
(1 row)
# select to_timestamp('2003-06-02 12:13:14', 'YYYY-MM-DD HH24:MI:SS') ;
to_timestamp
------------------------
2003-06-02 12:13:14-07
(1 row)
# select to_timestamp('2003-06-01', 'YYYY-MM-DD HH24:MI:SS') ;
to_timestamp
------------------------
2003-06-01 12:13:14-07
(1 row)
I suppose the proper behavior in this situation is debatable, but it seems
that the function should be stable.
FWIW, Oracle's behavior in this case (with 'to_date') is to return
'2003-06-01 00:00:00'.
"Stacy White" <harsh@computer.org> writes:
to_timestamp appears to pick up the time-of-day from the previous call's
return value if a date string has no time component. For example:
Weird. I do not see that here, on either 7.3.4 or current sources.
Can anyone else reproduce it?
For the record, I get:
regression=# select to_timestamp('2003-06-01', 'YYYY-MM-DD HH24:MI:SS') ;
to_timestamp
------------------------
2003-06-01 00:00:00-04
(1 row)
regression=# select to_timestamp('2003-06-02 12:13:14', 'YYYY-MM-DD HH24:MI:SS') ;
to_timestamp
------------------------
2003-06-02 12:13:14-04
(1 row)
regression=# select to_timestamp('2003-06-01', 'YYYY-MM-DD HH24:MI:SS') ;
to_timestamp
------------------------
2003-06-01 00:00:00-04
(1 row)
regards, tom lane
On Tue, 2 Sep 2003, Tom Lane wrote:
"Stacy White" <harsh@computer.org> writes:
to_timestamp appears to pick up the time-of-day from the previous call's
return value if a date string has no time component. For example:Weird. I do not see that here, on either 7.3.4 or current sources.
Can anyone else reproduce it?For the record, I get:
regression=# select to_timestamp('2003-06-01', 'YYYY-MM-DD HH24:MI:SS') ;
to_timestamp
------------------------
2003-06-01 00:00:00-04
(1 row)regression=# select to_timestamp('2003-06-02 12:13:14', 'YYYY-MM-DD HH24:MI:SS') ;
to_timestamp
------------------------
2003-06-02 12:13:14-04
(1 row)regression=# select to_timestamp('2003-06-01', 'YYYY-MM-DD HH24:MI:SS') ;
to_timestamp
------------------------
2003-06-01 00:00:00-04
(1 row)
I seem to get the incorrect behavior on my 7.4 beta 1 system. The
behavior on my machine is really wierd in fact even without times
involved:
test=# select to_timestamp('2003-06-04', 'YYYY-MM-DD HH24:MI:SS') ;
to_timestamp
------------------------
2003-06-04 00:00:00-07
(1 row)
test=# select to_timestamp('2003-06', 'YYYY-MM-DD HH24:MI:SS') ;
to_timestamp
------------------------
2003-06-04 00:00:00-07
(1 row)
test=# select to_timestamp('2003', 'YYYY-MM-DD HH24:MI:SS') ;
to_timestamp
------------------------
2003-01-01 00:04:00-08
(1 row)
test=# select to_timestamp('2003-06', 'YYYY-MM-DD HH24:MI:SS') ;
to_timestamp
------------------------
2003-06-04 00:00:00-07
(1 row)
test=# select to_timestamp('2003-07', 'YYYY-MM-DD HH24:MI:SS') ;
to_timestamp
------------------------
2003-07-04 00:00:00-07
(1 row)
----- Original Message -----
From: "Tom Lane" <tgl@sss.pgh.pa.us>
Newsgroups: comp.databases.postgresql.bugs
Sent: Wednesday, September 03, 2003 1:05 AM
Subject: Re: to_timestamp not stable if date string shorter than template
"Stacy White" <harsh@computer.org> writes:
to_timestamp appears to pick up the time-of-day from the previous call's
return value if a date string has no time component. For example:Weird. I do not see that here, on either 7.3.4 or current sources.
Can anyone else reproduce it?
I get on Postgres 7.3.3:
test=# select to_timestamp('2003-06-01', 'YYYY-MM-DD HH24:MI:SS') ;
to_timestamp
------------------------
2003-06-01 00:08:00+02
(1 row)
test=# select to_timestamp('2003-06-02 12:13:14', 'YYYY-MM-DD HH24:MI:SS') ;
to_timestamp
------------------------
2003-06-02 12:13:14+02
(1 row)
test=# select to_timestamp('2003-06-01', 'YYYY-MM-DD HH24:MI:SS') ;
to_timestamp
------------------------
2003-06-01 00:08:00+02
(1 row)
Why 00:08:00+02 ?
Regards
Gaetano Mendola