script.js

const daysE1 = document.getElementById('days');
const hoursE1 = document.getElementById('hours');
const minsE1 = document.getElementById('mins');
const secondsE1 = document.getElementById('seconds');

const newYears = '1 Jan 2022';

function countdown(){
    const newYearsDate = new Date(newYears);
    const currentDate = new Date();

    const totalSeconds = (newYearsDate - currentDate) / 1000;

    const days = Math.floor(totalSeconds / 3600 / 24);
    const hours = Math.floor(totalSeconds / 3600) % 24;
    const mins = Math.floor(totalSeconds / 60) % 60;
    const seconds = Math.floor(totalSeconds) % 60;

    daysE1.innerHTML = days;
    hoursE1.innerHTML = formatTime(hours);
    minsE1.innerHTML = formatTime(mins);
    secondsE1.innerHTML = formatTime(seconds);
}

function formatTime(time) {
    return time < 10 ? '0' + time : time;
}
//initial call
countdown();

setInterval(countdown, 1000);