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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Return value</title>
</head>
<body>
  <h1>Epoch ms return</h1>
  <pre id="out"></pre>
  <script>
    var date = new Date(Date.UTC(2026, 1, 26));
    var ms = date.setUTCFullYear(2027);
    document.getElementById("out").textContent =
      "Type: " + typeof ms + "\n" +
      "Matches getTime(): " + (ms === date.getTime());
  </script>
</body>
</html>

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JavaScript Date setUTCFullYear() — return value (Try It)