public function actionTasksReport()
 {
     $date_begin = isset($_GET['date_begin']) ? $_GET['date_begin'] : date('Y-m-d', strtotime('-6 day'));
     $date_end = isset($_GET['date_end']) ? $_GET['date_end'] : date('Y-m-d');
     return $this->render('report', array('report' => Task::getReport($date_begin, $date_end), 'date_begin' => $date_begin, 'date_end' => $date_end));
 }