And for a Sunday plan, just enter in a random day of the week and follow it?
For a Sunday plan, choose the park you are going to, note the hours and whether there is an EMH that Sunday. Also see if that park is recommended for that particular Sunday or not. THEN, find another day in the week that is similar or the same as those characteristics and use that day for your plan.
For example, you choose to go to the Magic Kingdom that Sunday, with evening EMH hours. It is not a recommended day to go, but you have it planned anyway. So, look through the week and find another day that has evening EMH and MK isn't recommended for the best park. Use that date for your plan.
Make sense?