Ah, I didn't say that advanced bookings didn't amount to anything, I said never count anything as definite until the booking's over and you have the money in your hand. That rule can count for same day bookings, bookings taken for tomorrow or for next month.
A lot of bookings taken in advance go ahead with no problems. Some do have problems in that the client is running late, the dates have been changed, or they just plain cancel.
It is nice to see your calender fill up with bookings, but as I say, I don't count them, or any other, as definite until the money's in my hand.