I recently flew CDG COO CDG on the same day (not a MR though) and when i went through immigration, my passport has been stamped with a wrong entry date...almost two months before the actual entry date. I realised this when a security airport officer pointed out my entry date (he was trying to get some money...but this is another story ), i immediatly showed him my boarding pass stating the correct date. Anyway the wrong entry date was well before the valid date stated on my visa... I guess it could have been a serious issue if i stayed longer than i did. Did anyone encounter similar thing? How did it happen? Did you have to argue ?