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Date Calculation Field


Level 1
My form contains a field which the end-user selects a date from a popup calendar. With the date selected I would like to add 90 days to it and post it in another field. Does anyone have an idea how to complete this task? Any help would be appreciated.
5 Replies


Level 5
Here is simple FormCalc code which I used in the past. Try with 'change' or 'exit' events of the date that allows user to select.

var givenDate

givenDate = $.rawValue

xfa.form.formname.subformname.Dateafter90.rawValue = Num2Date((givenDate + 90), "MMM DD, YYYY")

Good luck,



Level 1
Thanks for your help, but I still don't seem to understand how to do this. I have placed this code on my field that the end-user selects the date. And have named this field givenDate. My other field that I want the date + 90 I have named "Dateafter90". If you could provide a little more help I would appreciate it. I am a novice and this is a little over my head.


Level 5
shoot me an email with attaching a copy of your form at




Level 6

Here's another option.  FormCalc:

if (StartDate.rawValue==null) then

$.rawValue = ""


Num2Date(Date2Num(StartDate.formattedValue, DateFmt(2))  + 90, DateFmt(2))