To book a Monday you must book before 23:00 on Monday
To book a Tuesday you must book before 23:00 on Tuesday
To book a Wednesday you must book before 23:00 on Wednesday
To book a Thursday you must book before 23:00 on Thursday
To book a Friday you must book before 23:00 on Friday
To book a Saturday you must book before 23:00 on Saturday
To book a Sunday you must book before midnight on Saturday