[libreoffice-users] Calc on a Form

I have created a Spread sheet and have cells with results. Mostly the number of days between dates. 
I have been able to create a Table with this data and then a Form in database. What I am trying to 
do is have the number of days between two dates on the Form. First not sure what pulldown for the 
table field I should use (such as numeric or variable etc.) and is it possible to do a Calc on a 
Form?
I don’t mind reading the Docs, just can’t seem to get started to where I locate this info to start. 
Final outcome would to have a Form that a user can enter date data and have the result field (days) 
on the Form. (Protected of course)
Thanks
Dave 
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