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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>setMilliseconds() — zero</title>
</head>
<body>
  <h1>Snap milliseconds to zero</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var d = new Date(2026, 2, 15, 10, 0, 30, 789);
      d.setMilliseconds(0);
      var lines = [d.getMilliseconds(), d.getSeconds()];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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JavaScript Date setMilliseconds() — snap to .000 (Try It)