HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Top of hour</title>
</head>
<body>
  <h1>setMinutes(0, 0, 0)</h1>
  <pre id="out"></pre>
  <script>
    var date = new Date(2026, 2, 1, 14, 37, 22, 800);
    date.setMinutes(0, 0, 0);
    document.getElementById("out").textContent =
      "Hour: " + date.getHours() + "\n" +
      "Minute: " + date.getMinutes() + "\n" +
      "Second: " + date.getSeconds() + "\n" +
      "Ms: " + date.getMilliseconds();
  </script>
</body>
</html>

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JavaScript Date setMinutes() — top of hour (Try It)