Filter WordPress date on tables in backend

gistfile1.aw

// my custom field for the author is meta_key
// the field for table, filtering is my_author

$my_post_type = 'post';
add_filter( 'manage_edit-' . $my_post_type . '_columns', 'fb_add_columns' );

add_filter( 'manage_posts_custom_column', 'fb_return_custom_columns', 10, 3 );

add_filter( 'manage_edit-' . $my_post_type . '_sortable_columns', 'fb_sortable_columns' );

function fb_add_columns( $columns ) {
	// add id list
	$columns['my_author'] = __( 'My Author' );
	
	return $columns;
}

function fb_return_custom_columns( $column_name, $post_id ) {
	
	switch( $column_name ) {
		case 'my_author':
			$value = get_post_meta($post_id, 'meta_key', TRUE);
			break;
	}
	
	if ( isset( $value) )
		echo $value;
}

function fb_sortable_columns( $columns ) {
	
	$custom = array(
		// meta column id => sortby value used in query
		'my_author' => 'my_author',
	);
	
	return wp_parse_args( $custom, $columns );
}