Add x days to x date

Hi!

I am quite new at Acrobat and Javascript, which is a common lament on this discussion board from what I have read. But I need a little help!

I am creating a form in which the user needs to be able to input the estimated end date in the first field, and then input the number of days added in the next field, followed by an automatically calculated adjusted end date in the third field.

"OriginalDate" + "DaysAdded" = "NewDate"

Any help or links to help would be fantastic!!

Thank you!