Kinda miss some of it but time moves on.
So it was you that caused the y2k bug! : )
You were in a hurry and decided to leave off the 2 digits....
Realistically, all those systems were outmoded well before y2k but I guess they didn't have the foresight to write a routine to span the two centuries just as a matter of prodence. New systems evolved from the old so some code just got copied and expanded.
Sometimes I was in a hurry though to get out of there; you are right about that.
So much I have forgotten. Some I want to forget. I miss my Hollerith code then. And I liked to do my own keypunching from the code sheets because I could unwind a little . . .