<link rel="stylesheet" href="//code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css">
<script src="//code.jquery.com/jquery.min.js"></script>
<script src="//code.jquery.com/ui/1.11.4/jquery-ui.min.js"></script>
    
<script>
$(function() {
  $( "#datepicker1" ).datepicker({
    dateFormat: 'yy-mm-dd'
  });
});
</script>
    
생년월일: <input type="text" id="datepicker1">

<link rel="stylesheet" href="//code.jquery.com/ui/1.8.18/themes/base/jquery-ui.css" />
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script src="//code.jquery.com/ui/1.8.18/jquery-ui.min.js"></script>

<script>
$(function() {
  $( "#datepicker1" ).datepicker({
    dateFormat: 'yy.mm.dd',
    prevText: '이전 달',
    nextText: '다음 달',
    monthNames: ['1월','2월','3월','4월','5월','6월','7월','8월','9월','10월','11월','12월'],
    monthNamesShort: ['1월','2월','3월','4월','5월','6월','7월','8월','9월','10월','11월','12월'],
    dayNames: ['일','월','화','수','목','금','토'],
    dayNamesShort: ['일','월','화','수','목','금','토'],
    dayNamesMin: ['일','월','화','수','목','금','토'],
    showMonthAfterYear: true,
    changeMonth: true,
    changeYear: true,
    yearSuffix: '년'
  });
});
</script>
    
생년월일: <input type="text" id="datepicker1">

https://zetawiki.com/wiki/JQuery_UI_%EB%82%A0%EC%A7%9C%EC%84%A0%ED%83%9D%EA%B8%B0_datepicker

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