Believe me, FM, I wasn't taking the 'moron' bit personally!



As you say, people ought to be free to choose when to celebrate a certain event, and not to castigate others for choosing differently. After all, don't the Russian Orthodox celebrate Christmas on January 7th ( because of the calendar difference)? They're not 'wrong' any more than western Christians are 'wrong'.
In my field of work (embedded software), I'm constantly up against the dilemma that computers and microprocessors like to store numbers internally starting from zero (e.g. 0 to 99), whereas humans prefer to see things numbered starting from one (e.g. 1 to 100). So I'm constantly
adding one to a number, before displaying it to a user, and then
subtracting one from a number, after the user types it in. Plenty of opportunity for software bugs here!

I suppose that biases me towards preferring decades to begin with a year ending in '0'.