InfoPath Dev

Hi all, Is there any way for date difference calculation? I have a date picker field called "Trigger Date" which is set to now(), a second date picker field called "Due Date" which is set to addDays(Trigger Date, Count) "Count" is auto populated based on user selection so it can be 60 or 90. I would like to have a field to calculate the date difference between these 2 fields and also have a option where the due date is extended. How do I then calculate the difference? Thank you in advance!!

There isn't anything built in. You can find a number of rather complex formulas on the internet for this - here is one example: https://alecpojidaev.wordpress.com/2008/12/30/infopath-codeless-programming-walkthrough-2/