Adding columns to our Extended CPTs admin screen.

gistfile1.php

$options = array(
	'labels'     => $labels,
	'menu_icon'  => 'dashicons-media-document',
	'admin_cols' => array(
		'pixie_article_audience' => array(
			'taxonomy' => 'pixie-article-audience',
			'title'    => _x( 'Audience', 'Pixie Article Taxonomy', 'pixie-article' ),
		),
		'post_date' => array(
			'title'      => __( 'Created', 'Date', 'pixie-article' ),
			'post_field' => 'post_date',
		),
		'post_modified' => array(
			'title'      => __( 'Modified', 'Date', 'pixie-article' ),
			'post_field' => 'post_modified',
		),
	),
);
register_extended_post_type( 'pixie-article', $options );