10-03-2016 03:07 PM
While I think you would be better off creating a numeric variable instead of changing the character variable, that's a different story. Keeping my opinion out of it, here is a possibility:
length datevar $ 10;
datevar = put (input(datevar, mmddyy8.), mmddyys10.);
The "s" in the middle of the new format name indicates that slashes should be used as separators.