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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>toISOString()</title>
</head>
<body>
  <h1>Basic ISO output</h1>
  <pre id="out"></pre>
  <script>
    var date = new Date(Date.UTC(2026, 2, 15, 12, 0, 0));
    document.getElementById("out").textContent = date.toISOString();
  </script>
</body>
</html>

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JavaScript Date toISOString() — basic (Try It)