script.js

const days = document.querySelector("#days")
const hours = document.querySelector("#hours")
const minutes = document.querySelector("#mins")
const seconds = document.querySelector("#seconds")
function Updatetime() {
    const currentyear = new Date().getFullYear();
    const newYear = new Date(`january 1 ${currentyear + 1} 00:00:00`);
    const currentDate = new Date();
    const diff = newYear - currentDate;
    const d = Math.floor(diff / 1000 / 60 / 60 / 24);
    const h = Math.floor((diff / 1000 / 60 / 60) % 24);
    const m = Math.floor((diff / 1000 / 60) % 60);
    const s = Math.floor((diff / 1000) % 60);
    days.innerHTML = d < 10 ? "0" + d : d;
    hours.innerHTML = h < 10 ? "0" + h : h;
    minutes.innerHTML = m < 10 ? "0" + m : m;
    seconds.innerHTML = s < 10 ? "0" + s : s;
    //console.log(d + " " + h + " " + m + " " + s + " ");
}

setInterval(Updatetime, 1000);