title: XPath (XSLT) computing a different date from given date
body: <p>I'm trying to calculate maturity date of a term loan using information from the application. I know the functions to brake down a given date mm/dd/yyyy into date, month and year. Is there a function to create the new date after i've changed these values. 
  for example - a 360 month term loan with first payment date on 1/17/2016 will expire on 12/17/2045. 
  Please help! 
  Thank you very much. </p>