Originally Posted by
elpiett
A curiosity: say you enter schengen on jan 1st and leave jan 2nd. If you come back April 2nd you can actually legally stay till sep 1st, as your 90 days ended on 30th of June and a new period started on July 1st. A ruling from the EU court that has given a lot of border control officers headaches already

No. Under no circumstance can you exceed 90 consecutive days in the Schengen area, regardless of any variance of opinion as to how a 180 day period is calculated.