Display advanced custom fields values in WordPress admin columns

functions.php

/*
 * Add columns to exhibition post list
 */
 function add_acf_columns ( $columns ) {
   return array_merge ( $columns, array ( 
     'start_date' => __ ( 'Starts' ),
     'years'   => __ ( 'Years' ) 
   ) );
 }
 add_filter ( 'manage_exhibition_posts_columns', 'add_acf_columns' );
 
 /*
 * Add columns to exhibition post list
 */
 function exhibition_custom_column ( $column, $post_id ) {
   switch ( $column ) {
     case 'start_date':
       echo get_post_meta ( $post_id, 'start_date', true );
       break;
     case 'years':
        // repeater field
        $years = get_post_meta ( $post_id, 'years', true );
        for ($i=0; $i<$years; $i++) {
          $meta_key = 'years_'.$i.'_year';
          $sub_field_value = get_post_meta($post_id, $meta_key, true);
          if ($i > 0) {
            echo ', ';
          }
          echo $sub_field_value;
        }
        break;
   }
 }
 add_action ( 'manage_exhibition_posts_custom_column', 'exhibition_custom_column', 10, 2 );