Now i got this code and i works.
function get_events( ) {
$recurrence_ids = get_post_custom_values( '_recurrence_id' );
$recurrence_id = $recurrence_ids[0];
$the_query_args = array(
'posts_per_page' => -1,
'post_type' => 'event',
'meta_key' => '_recurrence_id',
'meta_value' => $recurrence_id
);
$the_query = new WP_Query( $the_query_args );
if ( $the_query->have_posts() ) {
$output="<div class="weitere-termine">";
while ( $the_query->have_posts() ) {
$the_query->the_post();
setlocale (LC_TIME, "de_DE.utf8");
$date = get_post_custom_values( '_event_start_date' );
if($date){
$date = strftime("%a. %d.%m.%Y", strtotime($date[0])) ;
}
$output .= '<a href="' . get_the_permalink() . '">';
$output .= '<span>' . $date . '</span>';
$output .= '</a>';
}
$output .= '</div>';
} else {
// no posts found
}
/* Restore original Post Data */
wp_reset_postdata();
return $output;
}
add_shortcode( 'get_events', 'get_events' );