React js Calculate Weeks, Days, Hours, and Minutes Ago from Custom Date Time to Current Date

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8" />
  <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">
     function getTimeAgo(dateTime) {
      const customDate = new Date(dateTime);
      const currentDate = new Date();
      const timeDifference = currentDate - customDate;
      const seconds = Math.floor(timeDifference / 1000);
      const minutes = Math.floor(seconds / 60);
      const hours = Math.floor(minutes / 60);
      const days = Math.floor(hours / 24);
      const weeks = Math.floor(days / 7);

if (weeks > 0) {
        return `${weeks} week${weeks > 1 ? 's' : ''} ago`;
      } else if (days > 0) {
        return `${days} day${days > 1 ? 's' : ''} ago`;
      } else if (hours > 0) {
        return `${hours} hour${hours > 1 ? 's' : ''} ago`;
      } else if (minutes > 0) {
        return `${minutes} minute${minutes > 1 ? 's' : ''} ago`;
      } else {
        return `${seconds} second${seconds > 1 ? 's' : ''} ago`;
      }
    }

const App = () => {
      const customDateTime = '2023-8-19 15:24:19'; // Use an ISO8601 format date
      const timeAgoString = getTimeAgo(customDateTime);

return (
        <div className='container'>
          <h3>React Js Time Difference</h3>
          <p>{timeAgoString}</p>
        </div>
      );
    }

ReactDOM.render(<App />, document.getElementById('app'));
  </script>
  <style>
    .container {
      border-radius: 8px;
      box-shadow: 0px 2px 4px rgba(0, 0, 0, 0.1);
      padding: 20px;
      margin: 20px auto;
      max-width: 400px;
      text-align: center;
    }

h3 {
      color: #333;
      font-size: 24px;
      margin-bottom: 10px;
    }

p {
      color: #666;
      font-size: 18px;
    }
  </style>
</body>

</html>