Thank you so much, Josh! This is precisely what we needed in our message board.
I made the modifications, and aside from some weirdness with mySQL server (which had to be restarted after adding the new field) and probably had nothing to do with this, I had not one glitch. My members are creating timers and VERY happy.
And one of the neatest things is that Josh improved upon the idea, making the countdown timer so much more user-friendly than the examples I posted.
Bravo!