JavaScript30/02-JS-CSS-Clock/main.js at main · sagarmittal1/JavaScript30 · GitHub

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setInterval(setClock, 1000);

const hourHand = document.querySelector('[data-hour-hand]');
const minuteHand = document.querySelector('[data-minute-hand]');
const secondHand = document.querySelector('[data-second-hand]');

function setClock() {
    const currentDate = new Date();
    const secondsRatio = currentDate.getSeconds() / 60;
    const minutesRatio = (secondsRatio +  currentDate.getMinutes()) / 60;
    const hoursRatio = (minutesRatio + currentDate.getHours()) / 12;

    setRotation(secondHand, secondsRatio);
    setRotation(minuteHand, minutesRatio);
    setRotation(hourHand, hoursRatio);
}

function setRotation(element, rotationRatio) {
    element.style.setProperty('--rotation', rotationRatio*360);
}

setClock();