var date = new Date();
var week = new Array("日曜日", "月曜日", "火曜日", "水曜日", "木曜日", "金曜日", "土曜日");
var dayOfWeek = week[date.getDay()];


document.write(date.getFullYear()  + "年" + (date.getMonth() + 1) + "月" + date.getDate() + "日" + dayOfWeek + "<br />\r\n");