I hope it works out for you. I actually tried to do the same with my 3rd (daughter's) recent order. Not only didn't it move the date any closer but it didn't even accept the shipping upgrade. This is the message I receive:
Important Message
We're sorry. An error occurred when we tried to process your request. Rest assured, we're working to resolve the problem as soon as possible. Please try again in a few minutes.
Well- that few minutes turned into two days. I seriously don't think there's a problem. I think they don't want people who have previously ordered to 'jump the line'. MHO