If you're trying to count the number of days for which you might get a refund, I believe you need to know when you
activated the pass, not when you
bought it. The day you activated the pass in person at Disney World determines your pass's expiration date; add 117 days to that date (for the number of days that the parks were closed) to figure out your extended expiration date. Your refund is supposed to be from 07/11/2020 to the extended expiration date. If your pass had block out dates, I believe you have to back those out.
If you look in
MDE today, you might see that Disney added another month to your extended expiration date. But if you cancel, you will not get a refund for that extra month.