Calculate number of days between two dates

Hello,

Trying to make a booking form where a visitor selects two dates using the date picker. Caldera won’t work out the amount of days between the two dates.
Therefore I can not use the amount of days multiply by a daily amount to give the visitor a total price.

I have now asked on 2 separate occasion via calderaforms.com/support over the last month with no reply. We’re happy to purchase any adons required to make this work but now with the lack of support, we’re almost in the process of looking for another form builder (EzForm Calculator is looking promising)

So please Caldera Support, can this be done or is it still 2 years in the making?

Thank you!