问如何删除过去在wordpress中使用时间戳发布帖子的选项？

EN

add_action('save_post', 'stop_publishing', 20);
function stop_publishing($post_id)
{
    $post = get_post($post_id);

    $post_date = $post->post_date;
    $current_date = date("Y-m-d");    

    //do your math of date calculation

    //user has set a date in the past, I am using an imaginary variable date_is_not_valid
    if ( $date_is_not_valid ) {
        $message = '<p>Please enter current or future date.</p>'
        . '<p><a href="' . admin_url('post.php?post=' . $post_id . '&action=edit') . '">Edit post</a></p>';
        wp_die($message, 'Error - Incorrect Date!');
    }   

}