カスタムタクソノミー「Days」に曜日を入力する必要がありました。クライアントが作成日をいじったり、そこに行って日やスペルミスを削除したりしたくありませんでした。上記のアドバイスに従って私はこれを思いつきましたが、それをコーディングするより簡潔な方法があるかどうか疑問に思っています:
 /*************************************** ...Create a Custom Taxonomy for days ******************************/
add_action( 'init', 'build_taxonomies', 0 );  
function build_taxonomies() {  
    register_taxonomy( 
    'days', 
    'schedule',
   array( 'hierarchical' => true, 
    'label' => 'Days',
    'query_var' => true, 
    'show_ui' => false, //removes the menus from admin menu and edit panel  
    'rewrite' => true ) );  
/*---------------------------------------Check to see if the days are created..if not, create them----*/
$parent_term = term_exists( 'days', 'days' ); // array is returned if taxonomy is given
$parent_term_id = $parent_term['term_id']; // get numeric term id
wp_insert_term(//this should probably be an array, but I kept getting errors..
        'Monday', // the term 
        'days', // the taxonomy
        array(
        'slug' => 'monday',
        'parent'=> $parent_term_id ));
wp_insert_term(
        'Tuesday', // the term 
        'days', // the taxonomy
        array(
        'slug' => 'tuesday',
        'parent'=> $parent_term_id ));
wp_insert_term(
        'Wednesday', // the term 
        'days', // the taxonomy
        array(
        'slug' => 'wednesday',
        'parent'=> $parent_term_id ));
wp_insert_term(
        'Thursday', // the term 
        'days', // the taxonomy
        array(
        'slug' => 'thursday',
        'parent'=> $parent_term_id ));
wp_insert_term(
        'Friday', // the term 
        'days', // the taxonomy
        array(
        'slug' => 'friday',
        'parent'=> $parent_term_id ));
wp_insert_term(
        'Saturday', // the term 
        'days', // the taxonomy
        array(
        'slug' => 'saturday',
        'parent'=> $parent_term_id ));
wp_insert_term(
        'Sunday', // the term 
        'days', // the taxonomy
        array(
        'slug' => 'sunday',
        'parent'=> $parent_term_id ));
}
/************ now I add my own meta box for days to get rid of extra controls *************/
add_action('admin_menu', 'add_custom_categories_box');
function add_custom_categories_box() {
 add_meta_box('myrelateddiv', 'Days*', 'ilc_post_related_meta_box', 'schedule', 'normal', 'low', array( 'taxonomy' => 'days' ));
}
function ilc_post_related_meta_box( $post, $box ) {
  $defaults = array('taxonomy' => 'related');
  if ( !isset($box['args']) || !is_array($box['args']) )
  $args = array();
  else
  $args = $box['args'];
  extract( wp_parse_args($args, $defaults), EXTR_SKIP );
  $tax = get_taxonomy($taxonomy);
?>
  <ul id="<?php echo $taxonomy; ?>checklist" class="list:<?php echo $taxonomy?> categorychecklist form-no-clear">
<?php
  wp_terms_checklist($post->ID, array( 'taxonomy' => $taxonomy, 'popular_cats' => $popular_ids, 'checked_ontop' => FALSE ) )
?>
</ul>