Add a new fieldtype ( calculated )
Add new fieldtype calculated which updated after enter values in fields.
( calculate +,-,*,/ for decial and date-time fields )
field 1 / Date started
field 2 / Date ended
field 3 (new calculated ) = field2-field3
Moshe Banks commented
Thank you for your great AppCreater which I use in medicine and it is importnt for me in my research,it worked quite nicely wth iphone4, but with the update to iphone4s when I go to search the keyboard desn't come up, it seemes that it need update to the new iphone4s.
Your help in this matter would be greatly appreciated.