忘れっぽいので、メモとして残しておく。

###HTML

date.html

<html>
<head>
<meta charset="utf-8" />
<script src="getDate.js"></script>
</head>
<body>
<b>今日の日付</b><br />
<a id="year"></a><a id="month"></a><a id="day"></a>
</body>
</html>

###Javascript

getDate.js

window.onload = function getDate(){
	var yyyy, mm, dd, today
	today = new Date();
	yyyy = today.getFullYear();
	mm = today.getMonth() + 1;
	dd = today.getDate();
	
	//年
	$Year = "<select>";
	for( var i=2000; i<=2030; i++ ){
		if( i == yyyy){
			$Year += "<option value=\"" + i + "\" selected >" + i + "</option>";
		}else{
			$Year += "<option value=\"" + i + "\" >" + i + "</option>";
		}
	}
	$Year += "</select>";
	document.getElementById("year").innerHTML = $Year + "年";
	
	//月
	$Month = "<select>";
	for( var i=1; i<=12; i++ ){
		if( i == mm){
			$Month+= "<option value=\"" + i + "\" selected >" + i + "</option>";
		}else{
			$Month+= "<option value=\"" + i + "\" >" + i + "</option>";
		}
	}
	$Month += "</select>";
	document.getElementById("month").innerHTML = $Month + "月";
	
	//日付
	$Day = "<select>";
	for( var i=1; i<=31; i++ ){
		if( i == dd){
			$Day+= "<option value=\"" + i + "\" selected >" + i + "</option>";
		}else{
			$Day+= "<option value=\"" + i + "\" >" + i + "</option>";
		}
	}
	$Day += "</select>";
	document.getElementById("day").innerHTML = $Day + "日";
}