Thomas Kellerer <spam_ea...@gmx.net> writes:
> is there any way (short of writing a function in an untrusted PL) to 
> determine the actual time zone (or time) of the server OS? 

The default value of the timezone parameter is as close as you'll get
in modern versions of PG.

> "show timezone" always returns the client's time zone. 

AFAIK that would only be true if some part of your client stack
is issuing a SET TIMEZONE command.  (libpq will do that if it finds
a PGTZ environment variable set, but not in response to plain TZ.)

If that's true, and you can't/don't want to change it, you could try

select reset_val from pg_settings where name = 'TimeZone';

                        regards, tom lane


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