My neighbor has Directv and my son has Comcast, none of their boxes have clocks either. I had a Tivo DVR years ago and it had a clock, problem was, it was so small you couldn't read it beyond 10 feet. 
Award for Community Excellence (A.C.E.)
achiever for 2012*
*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.