title: XSL add a duration (exslt date)
body: <p>I have an xsl where I want to display a default expiry date (now+1 month)</p>
  
  <p>I can display the current date with this (using: xmlns:date="http://exslt.org/dates-and-times" extension-element-prefixes="date")</p>
  
  <pre><code>&lt;xsl:variable name="currentdate" select="date:date()"/&gt;
  &lt;!-- add one month to $currentdate--&gt;
  &lt;xsl:value-of select="date:format-date($currentdate, 'MM/yy')"/&gt;
  </code></pre>
  
  <p>the problem I am having is that i can not seem to a time period to currentdate. Does anyone know how to do it?</p>