I need to set up a series of recurring dates in excel for various clients. They will be recurring in increments of every 2 weeks or every 3 weeks etc. I'll want to use it for easy access to the date I need to schedule the next appointment since I'll do that at the end of every month for the following month. So if my June appointment for client X is on the 19th the next will be July 10th then 17th and so on....how do I calculate that? Thanks!