lab8.js

function showDate(params) {
    let out = document.getElementById('today');
    let today = new Date();
    out.innerHTML = 'Сегодня: ' + today.toLocaleDateString ('ru-RU');
}
function showDaysCount(params){
    let today = new Date();
    let inputDate = document.querySelector('input[type=date]');
    let birthday = new Date(inputDate.value);
    let daysCount = (today - birthday)/1000/60/60/24;
    let result = document.getElementById('result');
    daysCount = Math.ceil (daysCount);
    result.innerHTML = 'С даты рождения прошло дней:' + daysCount;
}

window.addEventListener('load', showDate);

function showTime() {
    let outTime = document.getElementById('time');
    let currentTime = new Date();
    outTime.innerHTML = currentTime.toLocaleTimeString('ru');
}

window.addEventListener('load', showTime);
setInterval(showTime, 1000);