Hello Hilary - I compared your timeTest Rules and settings to what I had on my form, that I found in a book. Large difference, so I decided to delete the rules, etc., from my form and retyped your rules. The form has an error in the Total Hours, red dash and: (((Num... is all that is visible. If I mouse over, the message shows "Only numbers allowed". Not sure why this error is happening. The GrandTotal shows: NaN. I had a DatePicker and another box but not bound at all and actually deleted from my form...no joy. I could build on your sample but already have some cosmetic changes made on mine, plus I wanted to learn and understand what your code is doing. I can't see a difference and checked the Text Box, Language, etc. settings. I also encountered a weird and unrelated problem when trying to Publish to email, but I won't go off topic for this issue. Thanks for any suggestions.