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Thread: to_timestamp busted?

to_timestamp busted?

From
"Eliel Mamousette"
Date:
I have gotten some interesting results in testing out date
conversions using to_timestamp.

Given the query:

[NB: log_date and log_time are both varchar fields.
Yes I am yet another person parsing web server logs....]

SELECT timestamp(log_date || ' ' ||  log_time),
    log_date,
    log_time
FROM iis_log limit 10 ;

I get:
       timestamp        |  log_date  | log_time
------------------------+------------+----------
 2001-06-20 00:05:54-04 | 2001-06-20 | 00:05:54
 2001-06-23 00:01:45-04 | 2001-06-23 | 00:01:45
 2001-06-20 23:58:45-04 | 2001-06-20 | 23:58:45
 2001-06-23 00:01:48-04 | 2001-06-23 | 00:01:48
 2001-06-20 23:59:03-04 | 2001-06-20 | 23:59:03
 2001-06-23 00:02:42-04 | 2001-06-23 | 00:02:42
 2001-06-20 00:05:46-04 | 2001-06-20 | 00:05:46
 2001-06-23 00:02:48-04 | 2001-06-23 | 00:02:48
 2001-06-20 23:59:03-04 | 2001-06-20 | 23:59:03
 2001-06-23 00:03:15-04 | 2001-06-23 | 00:03:15
(10 rows)

which looks good to me.

But using:

SELECT to_timestamp(log_date || ' ' ||  log_time,
        'YYYY-MM-DD HH24:MM:SS'),
    log_date,
    log_time
FROM iis_log limit 10;

I get the bizarre results of:

      to_timestamp      |  log_date  | log_time
------------------------+------------+----------
 2001-05-20 00:00:54-04 | 2001-06-20 | 00:05:54
 2001-01-23 00:00:45-05 | 2001-06-23 | 00:01:45
 2005-10-20 23:00:45-04 | 2001-06-20 | 23:58:45
 2001-01-23 00:00:48-05 | 2001-06-23 | 00:01:48
 2005-11-20 23:00:03-05 | 2001-06-20 | 23:59:03
 2001-02-23 00:00:42-05 | 2001-06-23 | 00:02:42
 2001-05-20 00:00:46-04 | 2001-06-20 | 00:05:46
 2001-02-23 00:00:48-05 | 2001-06-23 | 00:02:48
 2005-11-20 23:00:03-05 | 2001-06-20 | 23:59:03
 2001-03-23 00:00:15-05 | 2001-06-23 | 00:03:15
(10 rows)

Anyone seen this before?

thanks,
    eliel

Re: to_timestamp busted?

From
Karel Zak
Date:
On Mon, Jun 25, 2001 at 02:03:55AM -0400, Eliel Mamousette wrote:

> SELECT to_timestamp(log_date || ' ' ||  log_time,
>         'YYYY-MM-DD HH24:MM:SS'),
                                 ^^
    MM = month number
    MI = minutes

test=# select to_timestamp('2001-06-20 00:05:54', 'YYYY-MM-DD HH24:MI:SS');
      to_timestamp
------------------------
 2001-06-20 00:05:54+02
(1 row)

                Karel


--
 Karel Zak  <zakkr@zf.jcu.cz>
 http://home.zf.jcu.cz/~zakkr/

 C, PostgreSQL, PHP, WWW, http://docs.linux.cz, http://mape.jcu.cz

Re: to_timestamp busted?

From
"Eric G. Miller"
Date:
On Mon, Jun 25, 2001 at 02:03:55AM -0400, Eliel Mamousette wrote:
> I have gotten some interesting results in testing out date
> conversions using to_timestamp.
>
> Given the query:
>
> [NB: log_date and log_time are both varchar fields.
> Yes I am yet another person parsing web server logs....]
>
[snip]
> But using:
>
> SELECT to_timestamp(log_date || ' ' ||  log_time,
>         'YYYY-MM-DD HH24:MM:SS'),

Take a hard look at your format specification.  Hmm, months and minutes
are the same. Maybe you want "MI" for minutes?

--
Eric G. Miller <egm2@jps.net>

RE: to_timestamp busted?

From
"Eliel Mamousette"
Date:
Drat!  User error strikes again.

Thanks for the fast eyes on this Karel!

-eliel

> -----Original Message-----
> From: Karel Zak [mailto:zakkr@zf.jcu.cz]
> Sent: Monday, June 25, 2001 4:25 AM
> To: Eliel Mamousette
> Cc: pgsql-general@postgresql.org
> Subject: Re: to_timestamp busted?
>
>
> On Mon, Jun 25, 2001 at 02:03:55AM -0400, Eliel Mamousette wrote:
>
> > SELECT to_timestamp(log_date || ' ' ||  log_time,
> >         'YYYY-MM-DD HH24:MM:SS'),
>                                  ^^
>     MM = month number
>     MI = minutes
>
> test=# select to_timestamp('2001-06-20 00:05:54', 'YYYY-MM-DD
> HH24:MI:SS');
>       to_timestamp
> ------------------------
>  2001-06-20 00:05:54+02
> (1 row)
>
>                 Karel
>
>
> --
>  Karel Zak  <zakkr@zf.jcu.cz>
>  http://home.zf.jcu.cz/~zakkr/
>
>  C, PostgreSQL, PHP, WWW, http://docs.linux.cz, http://mape.jcu.cz
>

Re: to_timestamp busted?

From
Tod McQuillin
Date:
On Mon, 25 Jun 2001, Eliel Mamousette wrote:

> But using:
>
> SELECT to_timestamp(log_date || ' ' ||  log_time,
>         'YYYY-MM-DD HH24:MM:SS'),
>     log_date,
>     log_time
> FROM iis_log limit 10;

Hold on... you said MM twice -- once in the date and once in the time.  I
don't expect you have months in your time, do you?

Try 'YYYY-MM-DD HH24:MI:SS'
--
Tod McQuillin