Basic Calendar Program Needed

I'm looking for a simple diet program that runs on PCs that would be a two-three month calendar printed out with certain information pre-filled, based on basic information provided. For instance, if I were to select tomorrow as the start date, and included that someone is doing a three week diet, I need it to say what day they are supposed to start, to stop, change to the next level of the diet, etc. The criteria would only be altered by the beginning date and how long the person will be on the diet and then the other information is static as far as how many days into the diet they are supposed to do each thing. The end result would be a printed calendar with the current, next and following months with the necessary information printed on the appropriate days. I'm not looking for something super fancy, just something accurate no matter what date is put in (so it needs to account for 30 days in some months, 31 in others, etc), easy to understand and clear and concise calendars that can be printed out in the end. Program needs to be Vista, XP and Windows 7 compatible and can be a stand alone program or internet website.