sending an email to owner when ticket is nearly due

Using RT-4.0.5 on Linux.

What is the best way to configure RT to automatically send an email to
the owner of a ticket when the ticket is nearly due? Let's say, 1 day
before the due date.

I've seen this page...

http://requesttracker.wikia.com/wiki/Reminders

...but it's for reminders. I'd like to just look at the existing tickets
and send the notifications when they're close to due date.

--
Florin Andrei
http://florin.myip.org/