入力フォームをクリックするとカレンダーが出てくるすごいやつ

input from calendar

<link rel="stylesheet" href="//ajax.googleapis.com/ajax/libs/jqueryui/1/themes/redmond/jquery-ui.css" >
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js" type="text/javascript"></script>
<script src="//ajax.googleapis.com/ajax/libs/jqueryui/1/jquery-ui.min.js"></script>
<script src="//ajax.googleapis.com/ajax/libs/jqueryui/1/i18n/jquery.ui.datepicker-ja.min.js"></script>
<script>
$(function() {
	$("#datepicker").datepicker({
		changeMonth: true,
		changeYear: true
	});
})
</script>