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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getSeconds() vs getUTCSeconds()</title>
</head>
<body>
  <h1>Local vs UTC seconds</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var d = new Date("1995-12-25T23:15:30Z");
      var lines = [
        "UTC: " + d.getUTCSeconds(),
        "local: " + d.getSeconds()
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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