Something like September 3rd would be 3-Sep-08. I would say just don't even abbreviate it, though, as Panjandrum suggested. If you're sending your resume to an American company, you could also write the date as MM/DD/ (YY)YY. For instance, today is "04/23/ (20)08" (you don't actually write the "20" in parenthesis. More @Wikipedia
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