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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>setUTCMilliseconds(0)</title>
</head>
<body>
  <h1>Zero UTC sub-seconds</h1>
  <pre id="out"></pre>
  <script>
    var date = new Date(Date.UTC(2026, 2, 1, 12, 30, 45, 789));
    date.setUTCMilliseconds(0);
    document.getElementById("out").textContent =
      "UTC seconds: " + date.getUTCSeconds() + "\n" +
      "UTC ms: " + date.getUTCMilliseconds() + "\n" +
      "ISO: " + date.toISOString();
  </script>
</body>
</html>

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JavaScript Date setUTCMilliseconds() — zero ms (Try It)