The issue is that setting does not change how much time is needed to prepare the food. For example, right now it is 1:51pm in my time zone. I have Foodbook set to 30 minute Delivery Time Slot. When I go to the checkout, I can choose 1:00pm, 1:30pm, 2:00pm, etc. Those times have already passed. (Yes, the time zone is correct.) Customers are ordering food in the parking lot, and coming in 2 minutes later and asking for their food. They should not be able to select a time slot that is in the past or the present time. Does that make sense?