private function get_author_subheading_html(stdClass $exportedauthor, int $timecreated) : string {
        $fullname = $exportedauthor->fullname;
        $profileurl = $exportedauthor->urls['profile'] ?? null;
        $formatteddate = userdate($timecreated, get_string('strftimedaydatetime', 'core_langconfig'));
        $name = $profileurl ? "<a href=\"{$profileurl}\">{$fullname}</a>" : $fullname;
        $date = "<time>{$formatteddate}</time>";
        return get_string('bynameondate', 'mod_forum', ['name' => $name, 'date' => $date]);
    }