Excel Help

I am trying to match some dates up and having some problems. In the example worksheet obviously a4 and c4 dont match up giving me the number 371 in e4. When I delete cells c4 & d4 it gives me the option of moving the cells up which I want but when I do so, the formula in e4 gets all screwed up and gives me the #ref tag. Another example is if I am trying to insert a couple cells because I am missing some data. If I try to insert a row at c10 and d10 and shift the cells down the formula starts to use a10-c11 screwing all the formulas up below and it doesn't run the calculation again. If I include e10 in that insert row I dont get an error but the formulas also dont calculate again. Let me know if there is an easy way around this problem I am having. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform excel