Calculating number of days from date entries

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Hi

Just wondering if its possible to do this.

I have two fields a start date and a end date, what i want is the the form to calculate the number of days between the start and end date and then to populate a field with the result which will then be multiplied by a particular amount to work our the final cost before advancing to PayPal.

 

any advice would be great.

 

You can do this with the built-in calculations.
http://formidablepro.com/knowledgebase/field-calculations/

Your calculation would be something like this:
([end-date]-[start-date])*5

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