A friend who has a French 2nd home send me a link to this calculator that enables you to keep track of time when in the common travel area and more importantly tells you how many days are still available.
It appears to be simple to use.
https://ec.europa.eu/assets/home/visa-calculator/calculator.htm?lang=en
It appears to be simple to use.
https://ec.europa.eu/assets/home/visa-calculator/calculator.htm?lang=en