expire date for AP? same date--like 8/10/16-8/10/17?

[ldo]

if I activate an annual pass on 8/10/16 is it good on 8/10/17 or does it expire on 8/9/17?

 

[Gr8t Fan]

if I activate an annual pass on 8/10/16 is it good on 8/10/17 or does it expire on 8/9/17?

It expires 8/10/17.

 

[Robo]

if I activate an annual pass on 8/10/16

is it good on 8/10/17...

Yes.

 

[Robo]

It expires 8/10/17.

That's the problem that then OP is having.
What does "expires" mean?
(That day, or the nest day?)

In reality...

A WDW AP activated on 8/10/16 is good all the way through the closing of the parks on date 8/10/17.

(Yes, that would mean -in most cases- a minimum of 366 days of validity.)