Most issues with the weekend time change have been individual set top issues. In this situation, most times the cable box is not able to communicate back to the local headend to obtain the correct time and other updates.
Please give us a call at 1-800-COMCAST to arrange to have someone out to your home to investigate your issue further.
It could be an issue with your cable box or a signal issue to the specific cable box at your home. Thanks for your patience.