The little booklet that came in the mail after you made your reservation has all the dates listed for you in side toward the back.
We got a book with Toy Story Characters on it for our 2013 trip and then a book with Incredibles on it for this trip in 2016. We booked in October for 2016 and I can't remember how long it was before it came in the mail. Did you book a package? We did for both of trips. I guess if it doesn't come you'll have to count the old fashioned way. I hope you get one because it is a nice keepsake.I never received a booklet or anything from Disney after I made my reservation several months ago (we are going in June). Is this the new normal? Not getting anything other than email confirmation? Last time we went we got a package in the mail with a handy magnet listing all the important dates. But so far, nada.
It is not 180+10 for off site.If I remember correctly, mousing over Disney Experience on the website and selecting your name will have you login and then give you a summary of what you can do or how long until you can do it. This of course assumes you have a reservation to be on site, I believe if offsite its for you to know 180 days for ADR, 30 days for FP+ (<--- offsite, onsite is 60). I"m not really sure if you can do multiple days at 180, it might be only that day. Anyone who has stayed offsite know?