That worked Hilary. Thank you!!! I've used that formula before, it just didn't occur to me. For those who are interested, here is the formula to format the date MM/DD/YYYY - where @StartDate is the field from my 2DS(secondary data source) that I'm trying to format.
concat(number(substring(@Start_Date, 6, 2)), "/", number(substring(@Start_Date, 9, 2)), "/", number(substring(@Start_Date, 1, 4)))
Thank you again!
Scott