如果您有帖子的id，可以使用wp_update_post 并更改post_date.

foreach ($postId as $id) {
  // random hour and time. You can also manually set these.
  $h = rand(1, 23);
  $i = rand(0, 59); 

  $newDate = array(
    \'ID\' => $id,
    \'post_date\' => "2013-12-19 $h:$i:59" // [ Y-m-d H:i:s ]
  );

  wp_update_post($newDate);
}