> i need help in adding "number of days" and "hiredate"(current day the
> movie is borrowed), so that i can get the Duedate to display in the
> text box once i click on the command button.
Use the DateAdd function. You'll find it in the online help. If
DueDate is entirely dependent on [Number of Days] and [HireDate] -- and
both those values are saved -- you don't really need to save the
calculated value. Just create a calculated control on your form with a
controlsource expression like this:
=DateAdd("d", [Number of Days], [HireDate])
Naturally, you'll have to replace "Number of Days" and "HireDate" with
the names of your own fields, if they are different.

Signature
Dirk Goldgar, MS Access MVP
www.datagnostics.com
(please reply to the newsgroup)