info:=File.info("input.txt");
  // -->T(size,last status change time,last mod time,isDir,mode), from stat(2)
info.println();
Time.Date.ctime(info[2]).println();
File.setModTime("input.txt",Time.Clock.mktime(2014,2,1,0,0,0));
File.info("input.txt")[2] : Time.Date.ctime(_).println();