Sorry, I thought the "format" was evident in the subject line. But, as it turns out, the format was not quite correct. It should be "m/d/yy, h/m PM" (or AM).
The original file was exported from iTunes v11.2.3 and opens by default in "TextEdit" app, which is quite useless. Instead, I opened the file in MS Excel (Filemaker is not an option). I tried to do the calculation to convert in Excel and didn't have much luck. so, since I wanted the information in FileMaker anyway, I created a FMP12 database and pre-populated it with Field Names that matched what was in the Excel file and imported the Excel file into FileMaker. FWIW I formatted the FMP "Date Added" field as a Timestamp.
Here is a small subset of the 17,623 record file I wanted to convert the "Date ADDED" field. I also removed several other fields to keep the size small.
Thanks again.
Stats 131130.fmp12.zip