title: Yii , show different date format in cgridview
body: <p>I had following cgridview in Yii application,
  I want to change date format in value,</p>
  
  <pre><code>'columns'=&gt;array(
          array(
                  'name'=&gt;'Date',
                  'header'=&gt;'Date',
                  'value'=&gt;'$data["work_date"]'
              ),
  </code></pre>
  
  <p>I want to show date in format dd-mm-yyyy currently it shows as yyyy-mm-dd.</p>