Time is wrong on my guide

We had a power outage yesterday for a few minutes and one of my TV's program guide time and actual programing is off/wrong, showing like 11 pm time and its really around 2 pm local time. Also can't choose any channels from the guide to watch, wrong programs, wrong times, channel won't show up at all- Blank, and the same error message comes up.

Error message: We are aware of this issue and are working to resolve it. 

How do I fix?