& sometimes even in same country but depending on who is using it. In USA, Social Security will use like mm/dd/yyyy. Passport will have dd MMM YYYY. Immigration

& sometimes even in same country but depending on who is using it. In USA, Social Security will use like mm/dd/yyyy. Passport will have dd MMM YYYY. Immigration documents from USCIS will have mmddyy. Some state documents will have mm-dd-yy