public static byte[] Bld_fmtr_viewed(
     Bry_fmtr fmtr, Xoae_app app, Xowe_wiki wiki, Bry_bfr wrdx_bfr, Xoa_ttl ttl) {
   byte[] view_time_item = Bry_.Empty;
   gplx.xowa.users.history.Xou_history_itm history_itm =
       app.Usere().History_mgr().Get_or_null(wiki.Domain_bry(), ttl.Full_txt_w_ttl_case());
   if (history_itm != null)
     view_time_item =
         fmtr.Bld_bry_many(wrdx_bfr, history_itm.View_end().XtoStr_fmt_yyyy_MM_dd_HH_mm_ss());
   return view_time_item;
 }