Well, I've heard arguments for changing the time/data stamp for copies. I
hate it, and would never use it, but for those who want it for whatever reason
can have it.
As with _anything_else, you should use the right tool for the job at hand. The
one that comes to mind for changing the date on a program is called 'touch' on
my machine. COPY on my machine is exactly that; it COPIES, and does not change
the date.
-larry