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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>toISOString() — invalid guard</title>
</head>
<body>
  <h1>Validate before toISOString()</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var bad = new Date("not-a-date");
      var out = document.getElementById("out");
      if (Number.isNaN(bad.getTime())) {
        out.textContent = "Bad input";
      } else {
        out.textContent = bad.toISOString();
      }
    })();
  </script>
</body>
</html>

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JavaScript Date toISOString() — RangeError guard (Try It)