I've gotta be in and out of Schengen a few times this summer for events in June to August (Like… Germany -> Portugal -> UK -> Portugal -> Croatia -> Belgium kinda thing). I won't risk hitting the 90 days then, but I'd also like to head that way this January and stay for as long as I can and I don't want to accidentally screw myself for the summer. Figuring out the dates is real, real messy.
Is there some kind of calculator I can use to track this so I can figure out exactly how many days I can spend there now? I plan to give myself some margin for error but it'd be nice to play with the dates a bit and I just can't find a nice way to do it.
(Also – I'm assuming it goes by calendar days, right? Like if I arrived on the 17th and left on the 18th, it would be 3 days even if I was there less than 48h?)