pgsql-bugs(at)postgresql(dot)org writes:
> See the following session examples using the form given in the documentation. 'select timestamp(now());' fails similarly.
I'm afraid you've got bit by our continuing pursuit of SQL standard
compliance. The 7.2 release notes do point out:
Observe the following incompatibilities:
* The timestamp() function is no longer available. Use timestamp 'string' instead, or CAST.
but I notice that the last two examples in Table 4-17 "Date/Time Functions"
didn't get fixed. (AFAICT there are no other places in current
documentation that claim you can do that.)
regards, tom lane