Control when customers can book.
Hours
Set your weekly hours in Business Info. Your booking form only offers arrival windows inside the hours you're open.
Booking rules
In Customer page → Extra: Jobs at the same time (how many visits one arrival window can hold), Earliest booking (how much notice you need) and Book up to (how far ahead customers can book). They apply to every form that asks for a date — custom forms included — and the same rules are checked again when a form is sent.