I want people calling a DN to be automatic forwarded to another DN at an specific preconfigured time of the day. Is this possible in this version?
Yes, you can do it using Time of the Day Routing which is available with CM 4.2. Check http://www.cisco.com/en/US/customer/products/sw/voicesw/ps556/products_administration_guide_chapter09186a008070e483.html
So when you want the calls to be routed to another number at a pre-defined time, you should configure a Translation pattern which would be active at that time such that it changes the Called Number and therfore forwarding the call to a different number.