I am in need of a custom date picker to put on sales orders that will allow me to block multiple dates to make them unavailable to select. Does anyone have any suggestions on third party libraries, or any type of solution they may have used in the past for this?

Could you just use validateField and clear out the chosen date and put an alert to the user saying the date is invalid?

That was my backup plan. Im trying to avoid the "guess and check" method though just for user experience sake. I did find a library called easpick that i've loaded into an inlinehtml field that seems to be working though. I appreciate the idea!