Here is 类似的问题。

对我有效的最简单的解决方案是使用upload_dir 滤器将下面的代码放入functions.php 文件

function wpcb_upload_dir_filter($uploads){
    $day = date(\'d\');
    $uploads[\'path\'] .= \'/\' . $day;
    $uploads[\'url\']  .= \'/\' . $day;
    return $uploads;
}
add_filter(\'upload_dir\', \'wpcb_upload_dir_filter\');