HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Offset in hours</title>
</head>
<body>
  <h1>Offset hours</h1>
  <pre id="out"></pre>
  <script>
    var offsetHours = new Date().getTimezoneOffset() / 60;
    document.getElementById("out").textContent =
      "Offset (hours): " + offsetHours;
  </script>
</body>
</html>

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JavaScript Date getTimezoneOffset() — hours (Try It)