Adminbereich ausgabe nach datum sortieren

Wie bekomme ich es hin, das folgendes Plugin die Ausgabe im Adminbereich nach Datum sortiert.

Die Ebooks erscheinen auch nicht im Monatsarchiv.

<?php

/*
Plugin Name: MyBooks
Description: Flash Magazine als neuen Post Typ anzeigen
Author: Matthias
Version: 0.0.2
Author URI: http://www.wandernimsaaletal.de
*/

/*  Copyright 2013  Matthias Reichert (email : matthias-reichert@mr-73.de)

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

add_action( 'init', 'create_post_type' );

function create_post_type() {

$labels = array(
'name' => 'E-Books Einträge',
'singular_name' => 'E-Books',
'menu_name' => 'E-Books',
'parent_item_colon' => '',
'all_items' => 'Alle Einträge',
'view_item' => 'Eintrag ansehen',
'add_new_item' => 'Neuer Eintrag',
'add_new' => 'Hinzufügen',
'edit_item' => 'Eintrag bearbeiten',
'update_item' => 'Update Eintrag',
'search_items' => 'E-Books suchen',
'not_found' => 'Kein E-Book gefunden',
'not_found_in_trash' => '',
);

$rewrite = array(
'slug' => 'book',
'with_front' => true,
'pages' => true,
'feeds' => true,
);

$args = array(
    'labels' => $labels,
 	'public' => true, // Öffentlich zugänglich
	'publicly_queryable' => true,
	'show_ui' => true, // Im Administrationsbereich anzeigen
	'show_in_menu' => true, // Im Menü anzeigen
	'query_var' => true, // Für eigene Querys zugänglich machen
    'rewrite' => true,
    'capability_type' => 'post',
    'has_archive' => true,
    'hierarchical' => true,
    'menu_position' => null,
    'supports' => array('title','editor','thumbnail','excerpt','comments','customfields'),
	'taxonomies' => array( 'category', 'post_tag' ), // add default post categories and tags
	'public' => true,
	'rewrite' => array('slug' => 'custom')
);

	register_post_type( 'book', $args );
	register_taxonomy_for_object_type( 'category', 'book' );	

}

// hook into the init action and call create_book_taxonomies when it fires
add_action( 'init', 'create_book_taxonomies', 0 );

// create two taxonomies, genres and writers for the post type "book"
function create_book_taxonomies() {

	// Add new taxonomy, make it hierarchical (like categories)
	$labels = array(
		'name'              => _x( 'Regionen', 'taxonomy general name' ),
		'singular_name'     => _x( 'Region', 'taxonomy singular name' ),
		'search_items'      => __( 'Search Region' ),
		'all_items'         => __( 'All Regionen' ),
		'parent_item'       => __( 'Parent Region' ),
		'parent_item_colon' => __( 'Parent Region:' ),
		'edit_item'         => __( 'Edit Region' ),
		'update_item'       => __( 'Update Region' ),
		'add_new_item'      => __( 'Add New Region' ),
		'new_item_name'     => __( 'New Region Name' ),
		'menu_name'         => __( 'Region' ),
	);

	$args = array(
		'hierarchical'      => true,
		'labels'            => $labels,
		'show_ui'           => true,
		'show_admin_column' => true,
		'query_var'         => true,
		'rewrite'           => array( 'slug' => 'region' ),

	);

	register_taxonomy( 'region', array( 'book' ), $args );

}

/*
# Artikel Suchen und anzeigen
*/

add_filter( 'pre_get_posts', 'my_get_posts' );

function my_get_posts( $query ) {

	if ( is_home() && $query->is_main_query() )
		$query->set( 'post_type', array( 'post', 'page', 'book', 'region' ) );

	return $query;
}

function add_custom_types_to_tax( $query ) {
if( is_category() || is_tag() && empty( $query->query_vars['suppress_filters'] ) ) {

// Get all your post types
$post_types = array( 'post', 'book' );

$query->set( 'post_type', $post_types );
return $query;
}
}
add_filter( 'pre_get_posts', 'add_custom_types_to_tax' );

/*
 * Add Flash Magazine Metaboxes to book post-type
 *
 * http://codex.wordpress.org/Function_Reference/add_meta_box
 * http://blogs.sitepoint.com/guide-to-wordpress-custom-write-panels/
 */

/**
 * Adds a box to the main column on the Book edit screens.
 */
function book_add_custom_box() {

    $screens = array( 'book' );

    foreach ( $screens as $screen ) {

        add_meta_box(
            'book_sectionid',
            __( 'Flash Magazine Daten:', 'book_textdomain' ),
            'book_inner_custom_box',
            $screen
        );
    }
}
add_action( 'add_meta_boxes', 'book_add_custom_box' );

/**
 * Prints the box content.
 *
 * @param WP_Post $post The object for the current post/page.
 */
function book_inner_custom_box( $post ) {

  // Add an nonce field so we can check for it later.
  wp_nonce_field( 'book_inner_custom_box', 'book_inner_custom_box_nonce' );

  /*
   * Use get_post_meta() to retrieve an existing value
   * from the database and use the value for the form.
   */

  $value1 = get_post_meta( $post->ID, '_my_meta_value_key', true );
  echo '<label><b>Flash Magazin Link:</b><label>';
  echo '<br><input type="text" id="flashmagazin" name="flashmagazin" value="' . esc_attr( $value1 ) . '" size="75" /><br>';

  $value2 = get_post_meta( $post->ID, 'pdfurl', true );
  echo '<br><label><b>PDF Dokument Link:</b><label><br>';
  echo '<input type="text" id="pdfurl" name="pdfurl" value="' . esc_attr( $value2 ) . '" size="75" /><br><br>';

  echo '<label><b>I-Frame Link:</b><label><br>';
  $value3 = get_post_meta( $post->ID, 'artikelurl', true );
  echo '<input type="text" id="artikelurl" name="artikelurl" value="' . esc_attr( $value3 ) . '" size="75" /><br><br>';    

}

/**
 * When the post is saved, saves our custom data.
 *
 * @param int $post_id The ID of the post being saved.
 */
function book_save_postdata( $post_id ) {

  /*
   * We need to verify this came from the our screen and with proper authorization,
   * because save_post can be triggered at other times.
   */

  // Check if our nonce is set.
  if ( ! isset( $_POST['book_inner_custom_box_nonce'] ) )
    return $post_id;

  $nonce = $_POST['book_inner_custom_box_nonce'];

  // Verify that the nonce is valid.
  if ( ! wp_verify_nonce( $nonce, 'book_inner_custom_box' ) )
      return $post_id;

  // If this is an autosave, our form has not been submitted, so we don't want to do anything.
  if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
      return $post_id;

  // Check the user's permissions.
  if ( 'book' == $_POST['post_type'] ) {

    if ( ! current_user_can( 'edit_page', $post_id ) )
        return $post_id;

  } else {

    if ( ! current_user_can( 'edit_post', $post_id ) )
        return $post_id;
  }

  /* OK, its safe for us to save the data now. */

  // Sanitize user input.
  $mydata1 = sanitize_text_field( $_POST['flashmagazin'] );
  $mydata2 = sanitize_text_field( $_POST['pdfurl'] );
  $mydata3 = sanitize_text_field( $_POST['artikelurl'] );
  $mydata4 = sanitize_text_field( $_POST['_store'] );

  // Update the meta field in the database.
  update_post_meta( $post_id, '_my_meta_value_key', $mydata1 );

  // Update the meta field in the database.
  update_post_meta( $post_id, 'pdfurl', $mydata2 );

  // Update the meta field in the database.
  update_post_meta( $post_id, 'artikelurl', $mydata3 );  

}
add_action( 'save_post', 'book_save_postdata' );

?>