datetime problems

I'd like to issue a query that lists all the rows of a table whose 'date'
columns(its type is datetime) is falls in a month, i.e. these rows were
inserted in , say August. How can I do that?

When I bugged with that problem I found an interesting bug:
elmu=> select date_trunc('month','now'::datetime);
date_trunc
-----------------------------
Thu Oct 01 00:00:00 1998 CEST
(1 row)

That's OK.

elmu=> select date_trunc('month','now'::datetime) + timespan('1
month'::reltime)
;
?column?
----------------------------
Sat Oct 31 23:00:00 1998 CET
(1 row)

Why not Nov 1?

--------------------------------------------------------------------------------
Sebestyén Zoltán AKA Memphisto It all seems so stupid,
it makes me want to give up.
szoli(at)neumann(dot)cs(dot)elte(dot)hu But why should I give up,
when it all seems so stupid?

MAKE INSTALL NOT WAR And please avoid Necrosoft Widows