你能给我解释一下如何添加筛选日期：“1周前”

谢谢你的帮助

/* Variables from the widget settings. */

        $title = apply_filters(\'widget_title\', $instance[\'title\'] );

        $number = $instance[\'number\'];

        $checkbox = $instance[\'checkbox\'];

        $top_popular_posts = new WP_Query(\'showposts=\' . $number . \'&orderby=rand&order=DESC\');


        if ($top_popular_posts->have_posts()) :



        echo $before_widget;