您可以使用pre_get_posts 钩子以修改主查询：

add_action( \'pre_get_posts\', \'filter_old_posts\' );
function filter_old_posts($query){
    if( !is_admin() && $query->is_main_query()){
         add_filter(\'posts_where\', $callback = function( $where = \'\'){
             $where .= " AND post_date > \'" . date(\'Y-m-d\', strtotime(\'-2 years\')) . "\'"; 
             return $where;
         });
         add_filter(\'getarchives_where\', $callback );
    }
}

还有一个使用getarchives_where 筛选存档小部件结果。