Auto Calculating Dates w/Conditions

I want to be able to create auto calculations, based off of the following examples in the table:

1 Year Contract

1 Year Contact Paid in Full

2 Year Contract

2 Year Contract Paid in Full

M2M (month to month contract)

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 "Free Month" will add one month to the expiration

I've tried to do it in the attached form, but I'm having the issues working through the conditional logic to get it to play in an actual use case scenario.  And ideas or suggestions would be helpful, thank you!

Hi,

I need to ask more details to understand the actual requirements you need.

I checked  your jotform http://www.jotformpro.com/form/42916390730960.

Can you describe what needs to be calculated? 

Was it suppose to be number of days/months/year between 2 dates?

You can calculate date difference similar to this form template http://www.jotform.com/form-templates/calculate-number-of-days

If Days can be counted, then its possible to determine months(30 days) or years(365 days).

After getting the auto calculated number of Days.. you can then use the number to calculate amount/price.

Hope this help. Please inform us if  you need further assistance.

Thanks.