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【javascript】stringのyyyy年mm月dd日をyyyymmddにフォーマットする。

Last updated at Posted at 2021-09-06

業務の中でどうしても年月日表記のデータを数字だけの表記に変換したい。

例)
渡ってくるデータ → 2021年09月06日(月)
変換後の値    → 20210906

moment.jsを使用して変更

index.html
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.10.6/moment.js"></script>
</head>
<div id="date">2021年09月06日(月)</div>
<script>
var get_id = document.getElementById("date")
var get_value = get_id.textContent
console.log(moment(get_value, 'YYYYMMDD').format('YYYYMMDD')) //20210906
</script>

replace()で変更

コメントにて @gsw213 様より
index.html
<div id="date">2021年09月06日(月)</div>
<script>
  const elem = document.getElementById('date');
  console.log(elem.textContent.replace(/\D/g, '')); // 20210906
</script>
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