>dbase
At the time I was managing a dBase / FoxPro medical software package...we were a small staff who had to come up with Y2K mitigation on our own.
Our problem is we only had source code for "our" part of the chain...other data was being fed into the system from external systems where we had no vendor support.
Thus our only conceivable plan was to do the old:
If $year<10;
date="20$year"
else
date="19$year"
It worked in 99.9% of the cases which was enough for us to limp thru and just fix the bad cases by hand as they happened. Eventually we migrated off the whole stack over the next few years so stopped being a problem. I'm sure many mitigation strategies did the same....