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I think any somewhat actively maintained software should be fixed by now, except devices that aren't seen as computers by the users and don't even have update mechanisms. And old COBOL programs running on some bank's mainframe, of course. Did your dad teach you COBOL?

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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).

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

No, I never learned COBOL. I learn some programming from him when I was like 7 or 8, some language one would never have heard of called FOCAL https://en.wikipedia.org/wiki/FOCAL_(programming_language) which was ripped off from DEC by the soviets for their little BK-0010 https://tvtropes.org/pmwiki/pmwiki.php/UsefulNotes/BK0010 and which I mostly used to play games loaded from tapes. Mostly I just really liked computers, just like him. He didn't stick with mainframe programming after the Y2K passed, I think he could have continued but he was bored...

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