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How to set PostgreSQL's internal clock?

Posted on 2004-09-02
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Last Modified: 2008-02-26
Hi.

I get the PostgreSQL internal time using this command: "SELECT CURRENT_TIMESTAMP". But since I installed PostgreSQL 8.0 Beta 1 on my windows I get different times between system time and PostgreSQL time.
How to set PostgreSQL's internal clock?

Thanks.
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Question by:pepoclv
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Author Comment

by:pepoclv
ID: 11967550
Look at this example:

Windows system time displays: 09/02/2004 4:53pm

PostgreSQL command "SELECT CURRENT_TIMESTAMP" returns: 09/02/2004 2:24pm
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Expert Comment

by:brozzis
ID: 11967633

AFAIK there is no internal clock in postgreSQL., it shouldn't make any sense.
I suppose it's the reason why it is still a beta version.

On my 7.4.2 works as expected, returning the system time.

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Accepted Solution

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ldbkutty earned 63 total points
ID: 11967736
Might be because the time set to some other timezone specification.

SET TIME ZONE LOCAL;  
will set the time zone to your local time zone (the one that the server's operating system defaults to) and then run

SELECT CURRENT_TIMESTAMP;
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Expert Comment

by:brozzis
ID: 11967837

In that case I'd expect a different hour, or half hour, not a complete different time.

...I've noticed right now that between 4:53 and 2:24  there's a difference of 2h29m,
that could lead the solution to a matter of time zones...

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Assisted Solution

by:earth man2
earth man2 earned 62 total points
ID: 11968493
You really need to define local timezone in postgresql.conf.  For me in GB I always use the following.

If you don't it returns UTC AFAIK

# - Locale and Formatting -

datestyle = 'sql, dmy'
timezone = 'Europe/London'              # actually, defaults to TZ environment setting
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Author Comment

by:pepoclv
ID: 11972219
Now I know that the problem is time zone. I tryed to set local timezone doing this: SET TIME ZONE 'GMT-3'; but it did not work.
When I run SELECT CURRENT_TIMESTAMP; it returns "2004-09-03 12:47:28.093-00".
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Expert Comment

by:earth man2
ID: 11972312
dev=# set session timezone to -3;
SET
dev=# select current_timestamp, current_timestamp at time zone 'BST';
          timestamptz          |          timezone          
-------------------------------+----------------------------
 03/09/2004 10:05:51.652133-03 | 03/09/2004 14:05:51.652133
(1 row)

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Expert Comment

by:earth man2
ID: 12063608
I think pg_tzset  look in directory /usr/share/postgresql/timezone   GMT-3 is in the "Etc" subdirectory so this works.

dev=> set session timezone to 'Etc/GMT-3';
SET
dev=> select current_timestamp, current_timestamp at time zone 'BST';
           timestamptz           |         timezone          
---------------------------------+---------------------------
 15/09/2004 15:12:13.14708 GMT-3 | 15/09/2004 13:12:13.14708
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