When I started the Steam Event for Old School RuneScape I thought it funny that it didn't accept my birthdate.
I admit, the first time I did it I entered it as MM/DD/YYY, after it said that I entered it incorrectly & needed to be DD/MM/YYYY and after 01/01/1900, I chuckled & entered my birthdate again but correctly, DD/MM/YYYY, but it still would not accept it.
I tried a few more times & no go.
So, I finally changed the year from 1963 to 1983 & it took it.
So now, I am 20 years younger LOL