if (empty($wp)) {
    require_once('wp-config.php');
    wp('feed=atom');
}
$more = 1;
$data = '<data>';
$my_query = new WP_Query('showposts=50');//change the number for showposts
//to how many post you want to show on the timeline.
 
while ($my_query->have_posts()){
	$my_query->the_post();
    $data .= '<event 
        start="';
        ob_start();
    	$data .= get_post_time('M d Y H:i:s \G\M\T', true);
    	ob_end_clean();
        $data .= '"
        isDuration="false"
        title="';
        ob_start();
        the_title_rss();
        $data .= ob_get_contents();
        ob_end_clean();
        $data .= '"
        link="';
        ob_start();
        permalink_single_rss();
        $data .= ob_get_contents();
        ob_end_clean();
        $data .= '">';
 
	ob_start();
	the_excerpt_rss(40, 1);
	$cool = ob_get_contents();
	ob_end_clean();
	$data .= str_replace('>','&gt;',str_replace('<', '&lt;',$cool));
	$data .= '</event>';
}
 
$data .= '</data>';
$fname = "timeline-xml.xml";//name of the file
$fhandle = fopen($fname,"w");
fwrite($fhandle,$data);
fclose($fhandle);