HTML Code

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

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