To block same-day check-ins, you can make a pricing rule that always sets the current day to "blocked". Check out this screenshot for an example of how to create this rule: Related ArticlesWhat is a floating window pricing rule?How do I increase prices on the weekends?How do I automatically block a day before or after a new reservation?How do I set how far out I want to receive bookings?How do I block check-in or check-out on a specific day?