> why do you write your years with a leading zero? I've never seen that before and it has quite a cognitive strain for me.

Not OP, but I had the same question and did a few seconds of cursory searching to no avail. But rather than cognitive strain, I found it opened up a much larger vista on the perception of time and our seeming place in it. While I am unlikely to adopt it, perhaps the experience would be even broader with a few more zeros tacked on! ;-)