global $ai1ec_calendar_helper, $ai1ec_events_helper;
                            $bits = date();
                            $start_time = gmmktime( 0, 0, 0, 1, 1, 1970 );
                            $end_time = gmmktime( 0, 0, 0, 1, 1, 2100 );

                            $events = $ai1ec_calendar_helper->get_events_between( $start_time, $end_time, 'publish', array(), array() );

                            $post_ids = array();
                            foreach( $events as $event ) :
                              $post_ids[] = $event->post_id;
                            endforeach;