Tried that, but it just keeps going from 10:59, 10:60, 10:61, 10:62 . . . 10:99, . . . then 10:01 and on and on.
Pulling fuse 3 reset the clock to 0:00, I set the time correctly and now its fine.
I'm guessing this is a variety of the problem whereby HIDs sometime cause electrical interference and send the RID mental.
Did I just tell Steppers something he didn't already know?