It's not even his birthday, but AMC is showing Clint Eastwood movies all day Saturday starting at 6:30am with The Good, The Bad, and The Ugly and ending at 4pm on Sunday with The Enforcer. The schedule is heavy on spaghetti westerns and Dirty Harry movies, but they are nearly all classics.
AMC is channel 38 in the Triangle. You can see the whole schedule at AMC's site. Set your DVRs!