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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getUTCSeconds vs getSeconds</title>
</head>
<body>
  <h1>Same instant</h1>
  <pre id="out"></pre>
  <script>
    var date = new Date("2026-06-15T20:45:30.000Z");
    document.getElementById("out").textContent =
      "UTC seconds: " + date.getUTCSeconds() + "\n" +
      "Local seconds: " + date.getSeconds();
  </script>
</body>
</html>

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