Sample Model With Modified DateTime Field Unset

Blog.php

<?php
App::uses('AppModel', 'Model');
/**
 * Blog Model
 *
 */
class Blog extends AppModel {
	public  $actsAs = array(
		'Sitemap.Sitemap' => array(
			// options for the Sitemap Behavior
			'lastmod' => false,  // will no longer attempt to use a last modified  date/time  field when generating the sitemap
		),
	);
}