I need a worksheet that will allow me to enter a date (for the horse show) and then my horses birthday to give me the horses' show age.
In Australia all horses age a year on 1st August so if the horse was born on Feb 2nd, 2012 on 1st August 2012 it will be one year old (even though technically it is only 5 months old it has to show as a yearling.

Ideas ??