We were experiencing the same issue as a lot of other people. Tried all the suggestions from other members to no avail. While setting there scratching my head and winding my watch I remembered mention of a reset button. Looked closely around the radio and nav screen for said button. Just to the left of the tubing knob, right below the word tune, I spotted a small indentation. It was about the size of the point of a ball point pen. Used a pen to push it in. It reset the nav but still no change. Tried it again but, this time I held it in for 10 seconds before releasing it. This time after the finished resetting the correct date and time appeared. Checked clock settings, all was good.