WordPress – How to add “Last Modified” column to page and post lists

The following code shows how to add a “Last Modified” column to the page and post lists in WordPress.

The “Last Modified” column will be sortable, allowing you to order the posts or pages by latest or oldest.

I highly recommend any customisations are placed into a custom plugin (NOT your theme’s functions.php file) – this way you can easily enable/disable the customisations and keep them when you update or replace your theme. See How to create a WordPress plugin for your custom functions for how to do this.

 

// Add the custom column to the post type
add_filter( 'manage_pages_columns', 'itsg_add_custom_column' );
add_filter( 'manage_posts_columns', 'itsg_add_custom_column' );
function itsg_add_custom_column( $columns ) {
    $columns['modified'] = 'Last Modified';

    return $columns;
}

// Add the data to the custom column
add_action( 'manage_pages_custom_column' , 'itsg_add_custom_column_data', 10, 2 );
add_action( 'manage_posts_custom_column' , 'itsg_add_custom_column_data', 10, 2 );
function itsg_add_custom_column_data( $column, $post_id ) {
    switch ( $column ) {
        case 'modified' :
			$date_format = 'Y/m/d';
			$post = get_post( $post_id );
			echo get_the_modified_date( $date_format, $post ); // the data that is displayed in the column
            break;
    }
}

// Make the custom column sortable
add_filter( 'manage_edit-page_sortable_columns', 'itsg_add_custom_column_make_sortable' );
add_filter( 'manage_edit-post_sortable_columns', 'itsg_add_custom_column_make_sortable' );
function itsg_add_custom_column_make_sortable( $columns ) {
	$columns['modified'] = 'modified';

	return $columns;
}

// Add custom column sort request to post list page
add_action( 'load-edit.php', 'itsg_add_custom_column_sort_request' );
function itsg_add_custom_column_sort_request() {
	add_filter( 'request', 'itsg_add_custom_column_do_sortable' );
}

// Handle the custom column sorting
function itsg_add_custom_column_do_sortable( $vars ) {
	// check if sorting has been applied
	if ( isset( $vars['orderby'] ) && 'modified' == $vars['orderby'] ) {

		// apply the sorting to the post list
		$vars = array_merge(
			$vars,
			array(
				'orderby' => 'post_modified'
			)
		);
	}

	return $vars;
}
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