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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>toLocaleTimeString() — locales</title>
</head>
<body>
  <h1>en-US vs en-GB (UTC)</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var event = new Date(Date.UTC(2012, 11, 20, 3, 0, 0));
      var utc = { timeZone: "UTC" };
      var lines = [
        event.toLocaleTimeString("en-US", utc),
        event.toLocaleTimeString("en-GB", utc)
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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JavaScript Date toLocaleTimeString() — locales UTC (Try It)