HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>setUTCSeconds(45, 500)</title>
</head>
<body>
  <h1>Two-arg overload</h1>
  <pre id="out"></pre>
  <script>
    var date = new Date(Date.UTC(2026, 2, 1, 9, 0, 0, 0));
    date.setUTCSeconds(45, 500);
    document.getElementById("out").textContent =
      "UTC second: " + date.getUTCSeconds() + "\n" +
      "UTC ms: " + date.getUTCMilliseconds() + "\n" +
      "ISO: " + date.toISOString();
  </script>
</body>
</html>

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JavaScript Date setUTCSeconds() — s + ms (Try It)