Re: TIME ZONE SQL

Hi Richard,
Follwing are the Results that I get

Lets say I am in IST (Indian standart time) 15:00:00 hrs
so equivalent time at US Mountain (-7:00) is 02:30:00 hrs
and equivalent time at Japan(+9:00) is 18:30:00hrs

NOW WHAT I have is this

I have following fields in my table "customer_events"

a) time_difference (which has values like +09:00 , -7:00, +00:00 etc)
b) start_time (has value like 11:00:00 , 10:00:00 etc)
c) send_before_time (has value like 00:15:00 , 00:07:00 etc)

select
((CURRENT_TIME(0) AT TIME ZONE "interval" (time_difference)) BETWEEN
(start_time::time - send_before_time::time)
and start_time::time) as yesno,
current_time(0),
CURRENT_TIME(0) AT TIME ZONE "interval" (time_difference),
(start_time::time - send_before_time::time) as difference,
time_difference
from
customer_events

WHEN I run "between" query like

((CURRENT_TIME(0) AT TIME ZONE "interval" (time_difference)) BETWEEN
(start_time::time - send_before_time::time)
and start_time::time)

it returns True (YES) when time_difference value are like +5:30 +5:00 i.e.
works fine for positive values
but failes for negative values i.e. -7:00, -6:00 time Zone values and
returns me FALSE.

So as per upper example
lets say for an Japanese event "start_time=18:34:00" and
"send_before_time="00:05:00" my above "between" query return true as
current_time at japan zone (18:30) lies between thtat

but for US Mountain event at "start_time=02:34:00" and
"send_before_time=00:05:00" above "between" query return FALSE and
current_time at US mountain zone (02:30) lies between that

I don't know WHY

Pls help.. in this. Also pls let me know if you need any other information.

With Regards,
Raman Garg

-- Raman
----- Original Message -----
From: "Richard Huxton" <dev(at)archonet(dot)com>
To: "Raman" <ramang(at)smartdatainc(dot)com>; "pgsql-sql"
<pgsql-sql(at)postgresql(dot)org>
Sent: Thursday, February 05, 2004 1:33 AM
Subject: Re: [SQL] TIME ZONE SQL

> On Wednesday 04 February 2004 17:57, Raman wrote:
> >
> > This query runs fine when i have
> > time_difference value like +5:30 +5:00 i.e. works fine for positive
values
> > but failes for negative values i.e. -7:00, -6:00 etc
> >
> > I don't know WHY WHY... pls help
> > I am helpless.
>
> Can you give example outputs? It's difficult to decide otherwise.
> --
> Richard Huxton
> Archonet Ltd
>