When does the weekend start

So.. you know I am not drinking wine. Well, that is not entirely true. Not drinking wine during the week. Only on the weekends. So the discussion at my house now is when does the weekend start and end. Some believe, ( like me) that the weekend begins on Thursday.. I remember in college that Thursday nights were often the beginning of the weekend.. Newell says that it doesn't begin until Friday at 5:00. Well, Ok than, so when does it end? Sunday night is still the weekend than, right? Well, he says Sunday at 5pm ends the weekend. Well, that just doesn't seem very fair. No Thursday night and no Sunday night. Not much of a weekend.. HMMMM...