I've noticed that the settable calendar in my digital waches (needed to automatically figure out the day of the week, given the date) goes up to a certain arbitrary year in the second half of the XXI century. This has got me thinking. Given that these watches will still be kicking by then, will the very old me or whoever will have them, still be able to somehow use the calendar function on the watches?

Do calendars repeat with a known year frequency (eg. January 1st being a Monday in a…

So what happens after the calendar on your digital watch is over?