In the tradition of asking the internet to clarify timing phrases (see the When Is Next Tuesday? post 686 days ago), I'll post another question.
I am always confused a little bit when someone mentions that an event has been "moved back."
So here's a simple question: If Dave is scheduled to give a presentation on the 15th of next month, and he can't make it on that day so he moves the presentation back a week, when is the presentation?