Re: Sybase to postgres Timestamp column
| От | Thomas Carroll |
|---|---|
| Тема | Re: Sybase to postgres Timestamp column |
| Дата | |
| Msg-id | 1473772846.1590447.1769011618201@mail.yahoo.com обсуждение |
| Ответ на | Re: Sybase to postgres Timestamp column (Tom Lane <tgl@sss.pgh.pa.us>) |
| Список | pgsql-admin |
A couple of things to look out for in terms of dates that I have come across. First, date formats:
Aug 20 2004 4:23:07.786PM -- Postgres
Aug 20 2004 4:23:07:786PM -- Sybase
Aug 20 2004 4:23:07:786PM -- Sybase
Note the separator difference between seconds and milliseconds (dot vs. colon).
Second: date math is different for Sybase vs. Postgres. A difference in days in Sybase is computed by counting date thresholds crossed. If I recall, Postgres counts 24 hour periods crossed.
Hope this helps.
Tom Carroll
On Wednesday, January 21, 2026 at 10:07:00 AM EST, Tom Lane <tgl@sss.pgh.pa.us> wrote:
Erik Wienhold <ewie@ewie.name> writes:
> On 2026-01-21 14:53 +0100, SASIKUMAR Devaraj wrote:
>> When we are migrating from sybase to postgres, we are facing issues
>> with Timestamp field format and not matching.
>> Sybase format: Jan 21 2026 5:35 PM
> I'm not familiar with Sybase. What issues are you facing?
> But Postgres should accept this timestamp format without issue:
Yeah, I don't see a difficulty on the input side, so I'm guessing
the OP is wishing Postgres would output timestamps in that format.
Sorry, none of the built-in datestyle settings quite match that.
It's easy to replicate pretty closely using to_char():
postgres=# select to_char('Jan 21 2026 5:35 PM'::timestamp, 'Mon DD YYYY HH:MI PM');
to_char
----------------------
Jan 21 2026 05:35 PM
(1 row)
But wrapping all your timestamp output columns in to_char() might be
more trouble than fixing the client-side code to accept ISO format.
regards, tom lane
> On 2026-01-21 14:53 +0100, SASIKUMAR Devaraj wrote:
>> When we are migrating from sybase to postgres, we are facing issues
>> with Timestamp field format and not matching.
>> Sybase format: Jan 21 2026 5:35 PM
> I'm not familiar with Sybase. What issues are you facing?
> But Postgres should accept this timestamp format without issue:
Yeah, I don't see a difficulty on the input side, so I'm guessing
the OP is wishing Postgres would output timestamps in that format.
Sorry, none of the built-in datestyle settings quite match that.
It's easy to replicate pretty closely using to_char():
postgres=# select to_char('Jan 21 2026 5:35 PM'::timestamp, 'Mon DD YYYY HH:MI PM');
to_char
----------------------
Jan 21 2026 05:35 PM
(1 row)
But wrapping all your timestamp output columns in to_char() might be
more trouble than fixing the client-side code to accept ISO format.
regards, tom lane
В списке pgsql-admin по дате отправления: