function program () {
	// 現在の時間を取得
	now = new Date();
	hh = now.getHours();
	
	if( hh < 4){
		location.href = getProgramDate(-1);
	} else {
		location.href = getProgramDate(0);
	}
	
}

function getProgramDate(afterDate) {
	// 現在の時間を取得
	
	var now = new Date();
	var dd = now.getDate();
	now.setDate(dd + afterDate);

	var fileName = "";
	fileName += now.getFullYear();
	
	// 月をMM形式で取得
	var month = now.getMonth() + 1;
	if (month < 10) {
		fileName += "0" + month.toString();
	} else {
		fileName += month.toString();
	}
	
	// 日付をDD形式で取得
	var date  = now.getDate();
	if (date < 10) {
		fileName += "0" + date.toString();
	} else {
		fileName += date.toString();
	}
	
	fileName += ".html";
	return fileName;
}