vincevincevince - 4:16 pm on Sep 20, 2007 (gmt 0)

If you do as netmeg suggest with PHP and you don't have a lot of traffic to start with on that site - set up the monthly changes in advance by a few months or you will just forget them on a small site. That's the biggest thing which has helped me! Before that I had far too many unbalanced tests due to one condition being a month long and the other being six months long.