[bluesmoon]

COBOL programs will be fine. They use 4 characters just for the year since it's stored as the decimal characters. I was trained in COBOL in the late 90s to work on Y2K migrations. It's done this way so that COBOL programs stored on punched cards are readable (also why COBOL has its line-length limitations).

[__d]

Except for the programs where it was too hard to change to 4 digit years, and we just shifted the epoch ...