USA date format (according to the HELP) is mm-dd-yy. In Your file date format is dd-mm-yyyy. Try to set date italian, and SET CENTURY ON. If this not work Chnage the field type to C(10), Add new field (at the end of table) Type (D) then just convert.
Against Stupidity the Gods themselves Contend in Vain - Johann Christoph Friedrich von Schiller
The only thing normal about database guys is their tables.