timestamp in 7.2

Hello all.

I'v migrated my data to 7.2.
Now I'm testing aplications, but looks like timestamp function in
postgres is broken:
klienti=# select date(now());
date
------------
2002-03-27
(1 row)

klienti=# select timestamp(date(now()));
ERROR: parser: parse error at or near "date"

I need to make querys with timestamp(date,time);
But timestamp don't work even with sample from manual:

klienti=# select timestamp(date '1998-02-24',time '23:07');
ERROR: parser: parse error at or near "date"

Mark