INTERSECT AND ORDER BY

I am trying to use the query below:

SELECT date_worked, hours_worked
FROM hours
WHERE date_worked < '8/15/2001'
INTERSECT
SELECT date_worked, hours_worked
FROM hours
WHERE date_worked > '8/8/2001'
ORDER BY date_worked

but Postgres does not seem to like the ORDER BY 	clause. Does 
anyone know if it is possible to use ORDER BY in conjunction with an 
INTERSECT statement? Does anyone have any alternative suggestions? I 
cannot use a temporary table because this is a Web-based application. 
Thanks in advance for your help.

Gary