I meant for you to right click on the date field when it was on the report canvas. It would be helpful if you provided more information up front. Now that you've explained that you actually want to use the date field with another field in a formula, there is a different solution, but I still don't know what field you want to concatenate this with. Let's say it is a string field. Then use:
totext(month({table.date}),"0") + "/" + totext(day({table.date}),0,"") +" "+ {table.string}
-LB