Schengen - What does 90 days in 180 days really mean?
The background: I am a Canadian citizen with a Canadian passport living in the UK under an Ancestry Visa.
My question: How are the 90 days every 180 days under Schengen counted? Is it a rolling 180 days, or is it counted some other way?
By "rolling 180 days," I mean they only look at the last 180 days to determine if you've stayed more than 90. As an example, assume I go into the Schengen area on January 1st and stay for 90 days, leaving on March 31st. I assume that mean I can't enter again until for the next 90 days (June 29th).
Come June 30th, can I re-enter the Schengen, as I would have only stayed 89 days in the last 180? And can I continue to stay, as each day the rolling 180 day window moves, giving me another day?
If it isn't calculated by a rolling 180 days, how is it counted?
Cheers,
Greg