tring is not in one of these formats, then the empty string (<code>''</code>) is returned.
      </p><p>
         The result is an English day name: one of <code>'Sunday'</code>, <code>'Monday'</code>, <code>'Tuesday'</code>, <code>'Wednesday'</code>, <code>'Thursday'</code> or <code>'Friday'</code>.
      </p></div><h2>Implementations</h2><p>
                  The following XSLT processors support <code>date:day-name</code>:
               </p><ul><li><a href="http://xml.apache.org/xalan-j">Xalan-J from Ap