Mine

public function fetchEvents() {
  $this->xmlrpc_client = new Zend_XmlRpc_Client($this->xmlrpc_server);
  date_default_timezone_set('Europe/Berlin');
  $date = Zend_XmlRpc_Value::getXmlRpcValue(time()-100000000, Zend_XmlRpc_Value::XMLRPC_TYPE_DATETIME);
  $start = $date->getValue();
  $date = Zend_XmlRpc_Value::getXmlRpcValue(time(), Zend_XmlRpc_Value::XMLRPC_TYPE_DATETIME);
  $end = $date->getValue();
  // prepare params for the request
  $params = array();
  $params[] = $start;
  $params[] = $end;
  $params[] = 'Europe/Berlin';
  return $this->query('ICal.listEvents', $params);
}