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I had assumed we would be getting at least stamped with dates in our passports. Stamped in, in The Netherlands stamped out at Croatian border with Serbia for instance. 21 days logged out of your possible 90, please come back soon sir. rushes upstairs Upon looking at my old passport, I have stamps in and out of countries like Bosnia, Albania, Montenegro etc which I got on a road trip in 2015 so...
That would seem the most basic way, then anyone with a brain/calculator could work it out. I just don't have that much confidence in any governing body of anything.
I guess, if you are questioned, if you make sure you always get stamped you have the evidence right there and you can use your own calculator/brain to prove you are innocent.
Stoo61-
I guess it depends on the borders. I've not done land borders to the EU for a LONG time so I guess you might need to ask for a stamp at a border crossing if they don't do one as standard. As I said, from memory of a former colleague, the onus is on you to prove no outstay. In honesty, though, I can't imagine a UK citizen is going to be too badly hassled.
atz
From memory I think it's 90days in any 180 rather than by half years, quarters or what have you. You will probably need to be able to prove when you got into the EU and when you exited it should you be asked. It always used to be the case on entry into the EU from 3rd party nations; the onus on the person to explain where they've been.