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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>isDate — invalid</title>
</head>
<body>
  <h1>Invalid Date</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var bad = new Date("???");
    document.getElementById("out").textContent =
      "isDate: " + _.isDate(bad) + "\n" +
      "invalidInstant: " + Number.isNaN(bad.getTime());
  </script>
</body>
</html>

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Lodash _.isDate — Invalid Date (Try It)