React Js Get Current Timestamp

<!DOCTYPE html>
<html>
  <head>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>
  </head>

<body>
    <div id="app"></div>
    <script type="text/babel">
      const { useEffect, useState } = React;
      const App = () => {
        const [timestamp, setTimestamp] = useState(0);

const reloadPage = () => {
          window.parent.location.reload();
        };

useEffect(() => {
          const currentTimestamp = Date.now();
          setTimestamp(currentTimestamp);
        }, []);

return (
          <div className="container">
            <h3>React Js get current timestamp</h3>
            <p>Current timestamp: {timestamp}</p>
            <button onClick={reloadPage}>Reload Page</button>
          </div>
        );
      };

ReactDOM.render(<App />, document.getElementById("app"));
    </script>
    <style>
      .container {
        max-width: 500px;
        margin: 0 auto;
        padding: 20px;
        border-radius: 8px;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
      }
      h3 {
        font-size: 24px;
        margin-bottom: 10px;
      }

p {
        font-size: 18px;
        margin-bottom: 20px;
      }

button {
        padding: 10px 20px;
        font-size: 16px;
        background-color: #4caf50;
        color: #fff;
        border: none;
        border-radius: 4px;
        cursor: pointer;
      }

button:hover {
        background-color: #45a049;
      }

button:active {
        background-color: #3e8e41;
      }

button:focus {
        outline: none;
      }
    </style>
  </body>
</html>