倒计时（React）

const endTimestamp = 1750896000000;
    function calculateTimeLeft(endTimestamp) {
        const difference = endTimestamp - Date.now();
        let timeLeft = {
            days: 0,
            hours: 0,
            minutes: 0,
            seconds: 0,
        };

        if (difference > 0) {
            timeLeft = {
                days: Math.floor(difference / (1000 * 60 * 60 * 24)),
                hours: Math.floor((difference / (1000 * 60 * 60)) % 24),
                minutes: Math.floor((difference / (1000 * 60)) % 60),
                seconds: Math.floor((difference / 1000) % 60),
            };
        }

        return timeLeft;
    }
const [timeLeft, setTimeLeft] = useState(calculateTimeLeft(endTimestamp));
    useEffect(() => {
        const timer = setInterval(() => {
            setTimeLeft(calculateTimeLeft(endTimestamp));
        }, 1000);

        return () => clearInterval(timer);
    }, [endTimestamp]);
const padZero = (num) => num.toString().padStart(2, '0');
<div className={styles.times}>
      <div>{padZero(timeLeft.days)}</div> : <div>{padZero(timeLeft.hours)}</div> :
      <div>{padZero(timeLeft.minutes)}</div> : <div>{padZero(timeLeft.seconds)}</div>
 </div>