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<!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script> <script src="https://unpkg.com/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 function App() { const [dateTime, setDateTime] = React.useState(''); React.useEffect(() => { const interval = setInterval(() => { const currentDate = new Date(); const year = currentDate.getFullYear(); const month = String(currentDate.getMonth() + 1).padStart(2, '0'); const day = String(currentDate.getDate()).padStart(2, '0'); const hours = String(currentDate.getHours()).padStart(2, '0'); const minutes = String(currentDate.getMinutes()).padStart(2, '0'); const seconds = String(currentDate.getSeconds()).padStart(2, '0'); const updatedDateTime = `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`; setDateTime(updatedDateTime); }, 1000); return () => { clearInterval(interval); }; }, []); return ( <div className="container"> <h3>React Js Date Time Format - YYYY-MM-DD HH:mm:ss</h3> <p>{dateTime}</p> </div> ); } ReactDOM.render(<App />, document.getElementById("app")); </script> <style> * { box-sizing: border-box; } body { font-family: Arial, sans-serif; margin: 0; padding: 0; } .container { text-align: center; padding: 20px; box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24); margin: 0 auto; max-width: 600px; } .container h3 { color: #333; font-size: 18px; margin-bottom: 10px; } .container p { color: #666; font-size: 16px; } </style> </body> </html>