How to pick dates from registered dates?

Hello,

I’m trying to use air datepicker to choose dates from the list of dates which are registered as non-business day. (let’s call the list as "“non-business day”)
I can set “non-business day” as “Blocked dates”, but now I want to set “dates other than “non-business day”” as “Blocked dates”.
Appreciate if you can help me to setup.

Thanks!