[Admin products sort by date] Adds the modified date to the Admin product column and gives the option to sort products by date modified #woocommerce

manage_edit-product_columns.php

add_filter( 'manage_edit-product_columns', 'admin_products_sort_modified', 9999 );
function admin_products_sort_modified( $columns ){
   $columns['laatst_bijgewerkt'] = 'Laatst bijgewerkt';
   return $columns;
}
 
add_action( 'manage_product_posts_custom_column', 'admin_products_sort_modified_content', 10, 2 );
function admin_products_sort_modified_content( $column, $product_id ){
    if ( $column == 'laatst_bijgewerkt' ) {
      //echo strtotime(get_the_modified_date("Y-m-d H:i:s", $product_id));
      echo get_the_modified_date("d F Y \o\m H:i", $product_id);
    }
}

add_filter( 'manage_edit-product_sortable_columns', 'admin_products_sort_modified_sortable' );
function admin_products_sort_modified_sortable( $columns ){
   $columns['laatst_bijgewerkt'] = 'laatst_bijgewerkt';
   return $columns;
}

add_action( 'pre_get_posts', 'reorder_sortable_column' );
function reorder_sortable_column( $query ) {
    if( ! is_admin() )
        return;

    $orderby = $query->get( 'orderby');
    if( 'laatst_bijgewerkt' == $orderby ) {
        $query->set('orderby','modified');
    } 
}