you are running bcp from a shell, so get the current date (M/D/Y) part into a variable:

set DATEVAR=%DATE:~4,10%

as part of a filename you probably want to change the / to - like this:

set mydate=%DATEVAR:/=-%

then you can use %mydate% in your batch command wherever you want the current date, like today would be: 02-20-2013