I remember dealing with the Y2K bug back in 1985. I was working at a stock brokers and 15-year bonds were maturing the same day. Some examples (in the spoiler) in case the reasoning isn't immediately obvious:

<Reveal this spoiler or all in this thread>

Anyway, I recall implementing the "4/100/400 leap year rule", along with changing YYMMDD to YYYYMMDD, as part of the fix.

— Ken

In reply to Re^3: My favourite way to spend a leap day ... by kcott
in thread My favourite way to spend a leap day ... by pollsters

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