LMAO at Superb Owl - that's what I call it too!
Yes I personally use ISO8601 YYYYMMDD so it is 20200202. The last was 20111102, the next 20211202. However these comprise 3 different numbers. 20200202 is just 2 different numbers. The last date to feature just 2 different numbers.........was 12211221. The next.........is 21111112.
So yes, super rare.