It works!!  Thank you for your patience and assistance.

Hi,The attachment you sent to me I cannot open.  I still cannot get this formula to work.  I am using Adobe Acrobat 8 Professional version 8.1.3.  Maybe that is why?

Thank you for your response.  I'm very new to the form design so bear with me.  Whatis a "change event"?I need clarification on the formula.  Do I use the actual name of the fields (ie complete (date/time field 1) and duedate (date time field 2) or just the kind of field and the number it is on the ...

Thanks for your quick response - i don't have the correct version of Adobe to open your example and I don't have administrative rights to download it :-(

I like your form but I can't see your formula?

I have a form that the user enters a date completed in one field and I want to have this date + 45 days calculated in another field (due date). Any ideas on the scripting for this?