I am not sure what I am doing wrong - but using this script I get an answer of zero? startT = StartTime.formattedValue endT = EndTime.formattedValue differenceT = Time2Num(endT, "HH:MM:SS") - Time2Num(startT, "HH:MM:SS")= Num2GMTime(differenceT, "HH:MM:SS")For the answer field I use a numericfieldCa...