Re: [pgsql-hackers-win32] Timezone database questions

Magnus Hagander wrote:
> >> >1)  How do we set the default local timezone for our
> >database?  The OS
> >> >knows the local timezone.  How do we set our local timezone
> >on Win32?
> >> >On Unix?  (On Unix, there is usually an /etc/localtime file that is
> >> >created during install.)  Perhaps we can query the current timezone
> >> >specification (e.g. EDT), and do some kind of lookup.  I
> >know of no way
> >> >to get the full specification, e.g. EST5EDT or America/New_York.
> >>
> >> Could we just require that it is configured through postgresql.conf?
> >> IIRC there is a parameter to set it there. IMO, that would be enough.
> >
> >We would get too many problem reports we would get if we always
> >defaulted the database timezone to GMT.  We have to set the default,
> >perhaps during initdb.  (I just posted something else explaining why we
> >should have initdb set sharedir and libdir too.)
>
> Set the defualt timezone at initdb sounds a bit weird. Again, timezone
> stuff is only used to present data, not to change it. You can even
> change it during a transaction. Setting the default at inidb seems
> weird. If you want to set the default, use postgresql.conf. Otherwise,
> we need to pick it up somewhere else.

Yea, sorry, I meant to say we need to pick up the local timezone on
postmaster start.

> >> If not, we can use GetTimeZoneInformation(). It returns the standard
> >> name (amongst other things) of the tz configured in the system.
> >
> >Yep, we will need that, and for Unix too.
>
> Can't tell you how to do it on Unix :-(
>
>
> >> Or do nothing. On unix it defaults to the value of the TZ environment
> >> variables. If you set that one before you start it, you get the same
> >> behaviour. In that case, I'd still say we *recommend* setting it in
> >> postgresql.conf, but it will still work.
> >
> >Right now I think it defaults to the OS timezone if you don't
> >set PGTZ.
> >We can't require everyone to set PGTZ to get a reasonable default
> >timezone.
>
> Note - TZ, not PGTZ. At least it says so in the postgresql.conf that is
> installed. So it's at least a standard env variable, and not a PG only
> one. I don't know how often this one is actually set, though.

Yes, sorry, TZ.  It is not set on my box.

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