app.js

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()