HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Log event</title>
</head>
<body>
  <h1>Event log</h1>
  <pre id="out"></pre>
  <script>
    function logEvent(message) {
      return JSON.stringify({ at: Date.now(), message: message });
    }
    document.getElementById("out").textContent =
      logEvent("User clicked Save");
  </script>
</body>
</html>

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JavaScript Date.now() — event log (Try It)