newbie:how can i get day of week data type... - Mailing list pgsql-general

i've created this table:
create table schedule (
day date,
tm timestamp,
room char(4));

insert into schedule values ('20/06/2001','08:00:00','A104');

my problem is how to get day of week information from date or is there any
way to do this?
would you show me how to do it?
thank's
Didi