it's all in the wording.
The tickets are valid for 14 days from activation.
When you say "in 14 days from now", you don't count today as day 1 but you count tomorrow as day 1
If today is the 1st of the month. In 14 days, we'll be the 15th.
So if I activate my ticket today (1st) it should still be valid 14 days from now, so valid until the 15th, but as I activated it today, that's 15 days total.
the main issue with the 15th or 22nd day is to know wether activation day is counted as day "0" or as day "1".
As it seems it's counted as day "0" and you get 14 days after the activation day.
Universal has a different wording.
Their tickets (bonus ticket) is valid for up to 14 consecutive days, and that's including the activation day.
Disney's T&Cs state that 14 days tickets expire 14 days from activation, and that's not the same.
today is the 19th
so say I activate my ticket today
20th is 1 day from now
21st is 2 days from now
22nd is 3 days from now
...
30th is 11 days from now
July 1st is 12 days from now
2nd is 13 days from now
and 3rd is 14 days from now (from 1st use)
but I've been able to use my ticket from the 19th of June through the 3rd of July and that's 15 days
the only issue here is to know if we get 14 days over a period of 15 days (meaning there must be a day we don't use the tickets) or if we get a full 15 days.
But as far as the wording goes, it makes sense to be able to use it on day 15th as it's really 14 days from (after) activation.