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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>isDate — valid</title>
</head>
<body>
  <h1>Valid instant helper</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    function isValidDate(value) {
      return _.isDate(value) && !Number.isNaN(value.getTime());
    }
    document.getElementById("out").textContent =
      "now: " + isValidDate(new Date()) + "\n" +
      "bad: " + isValidDate(new Date("???")) + "\n" +
      "iso: " + isValidDate("2024-06-01");
  </script>
</body>
</html>

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Lodash _.isDate — valid instant helper (Try It)