function ShowTime(){
var Dt = new Date();
var year = Dt.getFullYear() - 1988;
var minutes = Math.floor(Dt.getMinutes()/10)*10;
now = "（平成" + year + "年" + (Dt.getMonth() + 1) + "月" + Dt.getDate() + "日" + Dt.getHours() + "時" + minutes + "分現在）";
document.write( now );
}