How calculate the difference in months between two dates in Orbeon?

[Władysław Czaja]

Here I am trying to calculate the difference in months between two dates, but when  

https://demo.orbeon.com/demo/fr/orbeon/builder/edit/c7053ae8e94c829aaa1794ade5d4b4d2ef3fe9ed

When I try to use a function for the duration calculation I gets P0M  

[Alessandro Vernet]

Hi Władysław,

Good question: and I've linked to Michael Kay's answer below, which explains
why this doesn't come out-of-the-box with XPath.

https://stackoverflow.com/a/31484436/5295

-Alex

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[Władysław Czaja]

Alex, 

Is it possible to calculate between two dates in months , but in another way, not using XPath ? Can I use Java script ?

Vlad

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Władysław Czaja

[Alessandro Vernet]

Hi Vlad,

Formulas in Form Builder use XPath, not JavaScript, so I'm afraid that in
calculated values, or anywhere else you have a formula, you need to use
XPath.