下面的代码可能需要一些调整，但这里的技巧是获取第一次修订的日期，并将其应用于正在发布的帖子：

add_action(  \'transition_post_status\',  function ( $new_status, $old_status, $post )
{
  if ( $old_status == \'pending\'  &&  $new_status == \'publish\' 
       && $post->post_date_gmt == $post->post_modified_gmt) {
    $revisions = wp_get_post_revisions($post->ID);
    $oldest = NULL;
    foreach($revisions as $revision){
      $oldest = $revision->ID;
    };
    $previousdate = get_the_date( \'Y-m-d H:i:s\', $oldest );
    wp_update_post(
      array (
        \'ID\'            => $post->ID,
        \'post_date\'     => $previousdate,
        \'post_date_gmt\' => get_gmt_from_date( $previousdate )
      )
    );
  }

}, 10, 3 );