MultiDates Picker / Disable dates

[philquarter24]

I'm using Multi Dates Picker for Jquery for a booking application and it works well !
To disable "allready booked" dates, i use and .inc file containing dates to disable.
example:
'07/31/'+y, '08/01/'+y, '08/02/'+y, '08/03/'+y, '08/04/'+y, '08/05/'+y, '08/06/'+y, // resa 21-138
'08/07/'+y, '08/08/'+y, '08/09/'+y, '08/10/'+y, '08/11/'+y, '08/12/'+y, '08/13/'+y, // resa 21-154
'08/14/'+y, '08/15/'+y, '08/16/'+y, '08/17/'+y, '08/18/'+y, '08/19/'+y, '08/20/'+y // resa 21-163
For the actual year it works well, the y parameter is correctly supported.
But if i want to disable a date for the next year (ex 2022) it does't work.
I've tried: '08/20/'+2022 format, '08/20/'+y+1 format , '08/20/2022' format ... it still does'nt work.
What is the correct format to disable any date / year ?
Thanks for yr help.