Here's a simple sample form that uses a rule on form load to set a field to the label values based on the date the template is opened - change your system date to check the returned value before or after 8-31. This should at least give you a few ideas. You'll want to save the form linked in the heading of this post locally. Then right click it and select Design. From there, you can preview, look at the form load rules, etc.
Hilary Stoupa
