CSS clock

css-clock.markdown

CSS clock

A Pen by itbj00 on CodePen.

License.

index.html

<clock id="clock">
    <clock-pane>
        <num style="--i:1">1</num>
        <num style="--i:2">2</num>
        <num style="--i:3">3</num>
        <num style="--i:4">4</num>
        <num style="--i:5">5</num>
        <num style="--i:6">6</num>
        <num style="--i:7">7</num>
        <num style="--i:8">8</num>
        <num style="--i:9">9</num>
        <num style="--i:10">10</num>
        <num style="--i:11">11</num>
        <num style="--i:12">12</num>
    </clock-pane>
    <hour></hour>
    <min></min>
    <sec></sec>
</clock>

script.js

const d = new Date()
const h = d.getHours();
const m = d.getMinutes();
const s = d.getSeconds();
clock.style.setProperty('--ds', s)
clock.style.setProperty('--dm', m + s/60)
clock.style.setProperty('--dh', h + m/60 + s/3600)

style.css

body{
    display: grid;
    place-content: center;
    height: 100vh;
    margin: 0;
}
clock{
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 380px;
    height: 380px;
    font-size: 24px;
    border-radius: 20px;
    box-shadow: 2px 2px 20px rgba(0,0,0,.1);
    --step: 60s;
}

clock::before{
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: repeating-conic-gradient(from -.5deg,#333 0 1deg, transparent 0deg 30deg), repeating-conic-gradient(from -.5deg,#ccc 0 1deg, transparent 0deg 6deg);
    -webkit-mask: radial-gradient(transparent 145px, red 0);
}
clock-pane{
    width: 250px;
    height: 250px;
    position: absolute;
}
num{
    position: absolute;
    offset-path: path('M250 125c0 69.036-55.964 125-125 125S0 194.036 0 125 55.964 0 125 0s125 55.964 125 125z');
    offset-distance: calc( var(--i) * 10% / 1.2 - 25%);
    offset-rotate: 0deg;
}
hour{
    position: absolute;
    width: 4px;
    height: 60px;
    background: #333;
    transform-origin: center bottom;
    transform: translateY(-50%) rotate(0);
    animation: clock calc(var(--step) * 60 * 12) infinite linear;
    animation-delay: calc( -1 * var(--step) * var(--dh) * 60);
}
min{
    position: absolute;
    width: 4px;
    height: 90px;
    background: #333;
    transform-origin: center bottom;
    transform: translateY(-50%) rotate(0);
    animation: clock calc(var(--step) * 60) infinite linear;
    animation-delay: calc( -1 * var(--step) * var(--dm));
}
sec{
    position: absolute;
    width: 2px;
    height: 120px;
    background: red;
    transform-origin: center bottom;
    transform: translateY(-50%) rotate(0);
    animation: clock var(--step) infinite steps(60);
    animation-delay: calc( -1 * var(--step) * var(--ds) / 60 );
}
sec::after{
    content: '';
    position: absolute;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    left: 50%;
    bottom: 0;
    background: #fff;
    border: 4px solid #333;
    transform: translate(-50%, 50%);
}
@keyframes clock {
    to {
        transform: translateY(-50%) rotate(360deg);
    }
}