カレンダーを導入したい時のためのメモ.
<!DOCTYPE html>
<head>
<meta charset="utf-8">
<script src="https://code.jquery.com/jquery-1.10.2.min.js"></script>
<script>
$(function(){
$('#picker .cal').datepicker({
format: "yyyy年mm月dd日",
language: "ja"
});
$('.cal').on('changeDate', function() {
$('#in').text(
$('.cal').datepicker('getFormattedDate')
);
});
});
</script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.7.1/css/bootstrap-datepicker.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.7.1/js/bootstrap-datepicker.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.7.1/locales/bootstrap-datepicker.ja.min.js"></script>
</head>
<body>
<div id="picker">
<label><span id="in"></span>のカレンダー</label>
<div class="cal" data-date="2018年03月20日"></div>
</div>
</body>
</html>