script.js

setInterval(setClock, 1000)

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

function setClock() {
    const currentDate = new Date()
    const secondRatio = currentDate.getSeconds() / 60
    const minuteRatio = (secondRatio + currentDate.getMinutes()) / 60
    const hoursRatio = (minuteRatio + currentDate.getHours()) / 12
    setRotation(secondHand, secondRatio)
    setRotation(minuteHand, minuteRatio)
    setRotation(hourHand, hoursRatio)

}

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