HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>+24 hours</title>
</head>
<body>
  <h1>Add one day</h1>
  <pre id="out"></pre>
  <script>
    var date = new Date(2026, 2, 1, 12, 0, 0);
    var oneDayMs = 24 * 60 * 60 * 1000;
    date.setTime(date.getTime() + oneDayMs);
    document.getElementById("out").textContent =
      "Date: " + date.getDate() + "\n" +
      "Hour: " + date.getHours();
  </script>
</body>
</html>

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JavaScript Date setTime() — add 24 hours (Try It)