Mine did this and I went into the settings and you can tell it to use manual time or automatic synchronised with the radio, when I did this, the clock whirled and reset the time automatically, on my previous cars I has a similar thing where the clock was synchronised with the radio, can't remember if my 911 is, but I think so.
IIRC although the QP was on Automatic, I changed it to manual and saved then went back to auto and the clock whirled round to the correct time.