My next flight is scheduled to leave Beijing at January 18th for Milan with Warsaw Chopin as a transit. However, because the transit takes 8 hours and also because it takes only 10 minutes from WAW to city centre, I would like to get out of the airport to enjoy the city.
However, if I get out of WAW at January 18th and then get out of MXP at January 19th, which is the correct date that starts the Schengen period (I mean "90 days within any 180 days" restriction)? And which airport will I get a stamp put in my passport in?