>Thanks for the reply Erik. It's too bad that VFP does not have a time data type - it would have made things a little easier. If I convert the seconds to a time string and save the results in my database, I would be able to display the time string in the report detail band. However, I wouldn't be able to add up the fields to display totals in the summary band of the report. I guess this would work better if I can apply the conversion function on the report's field instead of the database field, but I don't know how to call a user's function from a report's field box. Any ideas?
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>Mon

just SET PROC to your procedure file before you call the report. In the field;

MyTimeFunc(tStart, tEnd)