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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getUTCFullYear vs getFullYear</title>
</head>
<body>
  <h1>Same instant</h1>
  <pre id="out"></pre>
  <script>
    var date = new Date("2025-12-31T23:30:00.000Z");
    document.getElementById("out").textContent =
      "UTC year: " + date.getUTCFullYear() + "\n" +
      "Local year: " + date.getFullYear();
  </script>
</body>
</html>

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JavaScript Date getUTCFullYear() — local vs UTC (Try It)