This is how your staff can be able to make reservations at an earlier date than you allow your guests.
How to do it
This is a package level setting so this setting can be different for every package. Within the package that you want to change, scroll down to host application package settings
Click edit.
The Admin cutoff time is how far in advance your staff can make reservations. Setting this number = 1 will allow your staff to make this reservation immediately in the host app.