Hi Michael, if your output is a string as well then you should be able to use something like Left(GV_Input,2) + '/' + Mid(GV_Input, 2, 2) + '/' + Right(GV_Input,4) in the Assign Data->Arithmetic Expression. I'm doing this from memory and I believe the 1st position in a string is actually position 0 as far as the Mid() function is concerned, and I've written it that way, but if I'm wrong you'll just need to adjust that.