Nope, if the promo begins on August 30th, then you can't get it before that date. As was mentioned, if you start your vacation on the last date of the promo then you can extend it past that date. I know it seems like it would extend both ways, but it doesn't. With the changes this year of weekends priced separately, each day possibly being different rates depending on which "season" it falls into, I can see the promo only applying to the original dates in the future with no extensions allowed afterward either. BTW, we just returned from a stay with the DDP- another change they've made is with the snacks ( others may already be aware- we weren't). No longer is it "anything under $4.00"- the choices are now limited to certain items. After being rushed at our two TS meals to pay and get outta there the dining plan isn't looking too appealing to us. After having less enjoyable meals and then tipping on top of that just because I can't stand NOT to leave a tip, we aren't seeing the value and benefits. We wouldn't normally eat at many TS locations so dining there just because it's included, plus the tip means that our original budget using CS meals, which is what my family prefers, with perhaps one special TS meal during our entire trip is looking better and better. Room only codes are also looking better and better vs. free dining which is no longer free. We are rethinking our Sept. bounceback trip pros and cons and that for our family's needs, paying room only plus OOP meals might be the WTG. For those that enjoy lots of TS though,it might be a tougher decision. I just hope people do take the time to really think what they want for the way their family personally likes to vacation at WDW since there are choices and something for everyone. For the OP, at least you'll get to have it both ways- a few days before without the DDP where hopefully you'll get a discount on the room itself, then the rest of your vacation with the DDP. It may even be a better plan than having the DDP the entire time.---Kathy