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Server Time Setting

From: "Lane Van Ingen" <lvaningen(at)esncc(dot)com>
To: <pgsql-hackers-win32(at)postgresql(dot)org>
Subject: Server Time Setting
Date: 2005-09-15 14:13:21
Message-ID: EKEMKEFLOMKDDLIALABIEEJNCCAA.lvaningen@esncc.com (view raw or flat)
Thread:
Lists: pgsql-hackers-win32
Tom Lane suggested that perhaps this mailing list would be a better place
to ask the following question ... since we have an application that is very
dependent on the accuracy of timestamps, this is a big issue to us.

-----Original Message-----
From: Tom Lane [mailto:tgl(at)sss(dot)pgh(dot)pa(dot)us]
Sent: Monday, September 12, 2005 6:42 PM
To: Lane Van Ingen
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: [ADMIN] Server Time Setting

"Lane Van Ingen" <lvaningen(at)esncc(dot)com> writes:
>> I am baffled as to why some of the PostgreSQL functions (like now() ) are
>> returning a time which is exactly an hour later than the server's actual
>> system time.

> I'd say you've got TimeZone set to something different than you think
> you do.
>			regards, tom lane

Before I asked this question yesterday, I had already checked SHOW ALL and
found only two PostgreSQL config parameters that seemed to apply, and they
appeared to be set properly:
  australian_timezones  = no
  TimeZone              = US/Eastern
We are running 8.0.1, Windows 2003.

Since last message, checked 3 other servers, and found that I have the same
problem on two out of three:
  Server #1: select now() agreed with Windows time on this one
  Server #2: select now() was exactly one hour greater than Windows time
             where config parms were set the same as previous paragraph
  Server #3: select now() was exactly one hour greater than Windows time,
             but config parm was set wrong: TimeZone = Europe/Dublin (don't
             know how that happened; makes you wonder if TimeZone has
             anything to do with this at all!)

Windows 2003 time was set correctly in all four cases.

Summary:
  - one server displays time correctly
  - two servers APPEAR to be set correctly in Windows, but time displayed
    from now() is one hour greater than Windows time
  - one server is set incorrectly (PostgreSQL TimeZone parameter was set to
    Dublin/Europe); but TimeZone did not appear to have any effect on the
    time being displayed, since now() is displaying time as one hour greater
    than Windows time, and Windows time appears to be set correctly

Being as one server is 'doing it right', there must be some difference in
settings, but so far I have not been able to determine what is different.
Windows appeared to be correct in all cases, but PostgreSQL is not.

---------------------------(end of broadcast)---------------------------



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Subject: Re: Server Time Setting
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