If you have a program with a Y2K problem, like SpeedEdit (aka "Speededt"), an HourGlass rule like:

   @,@.@,@ speededt.pub.bbs delta -20 years

might solve it for you!

The above rule says:

for any user, if the program is "SPEEDEDT.PUB.BBS", please set the clock back 20 years.