[squid-users] scheduling not working for me, what am I doing wrong?

I am unable to limit the hours squid will accept requests

squid3 -v
Squid Cache: Version 3.0.STABLE8 <---yes I know its older but will do
for my needs.

Ive tried this:

acl ACLTIME time SMTWHFA 06:00-23:30

http_access allow ACLTIME

and ive tried this:

acl ACLTIME time 06:00-23:30

http_access allow ACLTIME

None of the above actually works.

I am trying to shut off squids access between 23:30pm and 06:00am
Received on Wed Nov 23 2011 - 21:29:08 MST