Welcome to planDisney, Leanne! Wow, it's getting so close to your adventure at Walt Disney World- the excitement must be palpable at your place.
Usually, when you purchase
6-day tickets, you will have 9 days to use them. Ideally, it sounds like you want your Theme Park ticket to start on 20 August, as 28 August would be in your inclusive date range. You can modify your start date ahead of your trip by logging into your
My Disney Experience account. Select change tickets within the tickets section of My Plans, and you should be able to amend your start date here. This action must be completed before the start date of your ticket - my advice would be to do this right away. For whatever reason, if you have an issue changing this start date through My Disney Experience, you can always reach out to the ever-helpful
Cast Members at Disney's Guest Relations.
Another thing to note, if you change your ticket, any existing
Park Pass Reservations will not automatically transfer, so you may need to make new Reservations.
Leanne, I hope this information helps, and you enjoy a truly magical time at Walt Disney World. I will be right here if you need anything else ahead of your adventure, Louise.