Operations on data type Date

Hi all,

I am working on Aris MashZone. Simple example to explain my problem.

Column A and Columnn B are Dates (Start date and End date)

Column C is a Text ( Comments)

I want to have in my output duration (difference) in days between date from Column B and Columnn A.  I was trying to use block Arithmetic but it requires a Number type not a Date type.

How can I do it?

Thanks in advance,