> 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.
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G.