A few days ago, I posted this:
"My Wii U's clock suddenly switched to 3/31/13 at 7:59 P.M. a few hours ago. I switched it back. When I got on the internet browser, the "Favorite Bookmarks" list had rearranged. Why did this happen?"
Today, I checked my console's clock, and it was 2 days and 1 hour behind what it should have been.