Re: timezone, how postgres deal with it?

> This query returns false
> select ('2012-11-20 17:00:00-02:00'::timestamp with time zone) = ('2012-11-20 18:00:00-03:00'::timestamp with time
zone)

It's false for me, too.  Change '2012-11-20 18:00:00-03:00' to the correct '2012-11-20
16:00:00-03:00' and it will work as you expect.

--
G.