I'm sure you know it's picking up the first 2 digits of the year and add 1, except when it ends in 00, where you don't add anything. Is this last bit the issue? Yes, the year 2000 still belonged in the 20th century despite many... 🙄

No Bea, if I knew how it worked I wouldn't get confused. And no matter how many times i learn it, I always go and forget it again.