[thedoc (OP)]

Jon asked the Naked Scientists:
   
At the stroke of midnight, is tomorrow, today and yesterday all at the same place in time?
What do you think?

[Bill S]

To answer that one, Jon, I think you would have to define "present", because that's what you are asking about. 
At the present, are present, past and future all present?
Can the present be defined as a moment in time?
What is a moment?

"No man liveth more than that infinitesimal point of time that is the present." (M. Aurelius) - but what is a point?  Is it zero-dimensional?