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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>formatUtcSecondsWithMs</title>
</head>
<body>
  <h1>UTC seconds.ms</h1>
  <pre id="out"></pre>
  <script>
    function formatUtcSecondsWithMs(date) {
      var sec = date.getUTCSeconds();
      var ms = String(date.getUTCMilliseconds()).padStart(3, "0");
      return sec + "." + ms + "s UTC";
    }

    var sample = new Date(Date.UTC(2026, 6, 4, 10, 30, 7, 5));
    document.getElementById("out").textContent = formatUtcSecondsWithMs(sample);
  </script>
</body>
</html>

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JavaScript Date getUTCMilliseconds() — format (Try It)