Check this box if you don´t want users to be allowed to select a date before today. If you select a date that has passed you will get the following message:
Limitation in the future
If the administrator wants some time to make preparations e.g. to book a client or order food, you can set how close to todays date the selection of date is allowed to be made. You can set number of weeks, days and hours. If you for example set 5 days here, the user cannot select a date four days ahead.
Limit selectable days
Here you can set selectable weekdays. E.g. if you don´t want any bookings at weekends. If you try to select a date for a saturday or sunday you will get the following message: