title: How can I calculate the absolute value of a number in XSLT?
body: <p>I have</p>
  <pre><code>&lt;xsl:value-of select=&quot;DifferenceInDays&quot; /&gt; 
  </code></pre>
  <p><code>DifferenceInDays</code> has a value that can be a negative or a positive number, I want to display its absolute value. How can I do this?</p>