// 日付
    function displayDate(){
      var this_month = new Array(12);
      this_month[0]  = "1";
      this_month[1]  = "2";
      this_month[2]  = "3";
      this_month[3]  = "4";
      this_month[4]  = "5";
      this_month[5]  = "6";
      this_month[6]  = "7";
      this_month[7]  = "8";
      this_month[8]  = "9";
      this_month[9]  = "10";
      this_month[10] = "11";
      this_month[11] = "12";
      var today = new Date();
      var year  = today.getYear();
      var month = today.getMonth();
      var day   = today.getDate();
      if (year < 1900){
         year += 1900;
      }
      return(year+"年"+this_month[month]+"月"+day+"日");
    }