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clock.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
body {
margin: 0;
height: 100vh;
font-family: sans-serif;
}
body,
.controls,
.clock,
.basics {
display: flex;
justify-content: center;
align-items: center;
font-size: 32vmin;
}
.controls {
position: absolute;
top: 0;
left: 0;
width: 100vw;
}
.slider {
text-align: center;
width: 100%;
margin: 0 1rem;
}
input[type=range] {
width: calc(min(100%, 20rem));
}
.details {
display: flex;
flex-direction: column;
font-size: 12vmin;
}
</style>
</head>
<body>
<div class="clock">
<div class="basics">
<div class="hours"></div>
<div class="seperator">:</div>
<div class="minutes"></div>
</div>
<div class="details">
<div class="seconds"></div>
<div class="daytime"></div>
</div>
</div>
<script>
const basicsElement = document.querySelector('.basics')
const hoursElement = document.querySelector('.hours')
const minutesElement = document.querySelector('.minutes')
const detailsElement = document.querySelector('.details')
const secondsElement = document.querySelector('.seconds')
const daytimeElement = document.querySelector('.daytime')
const updateTime = (currentTime = new Date()) => {
let seconds = currentTime.getSeconds()
if (seconds < 10) seconds = '0' + seconds
let minutes = currentTime.getMinutes()
if (minutes < 10) minutes = '0' + minutes
let hours = currentTime.getHours()
const isPm = hours > 11
if (isPm) hours = hours - 12
if (hours === 0) hours = 12
const daytime = isPm ? 'PM' : 'AM'
hoursElement.innerText = hours
minutesElement.innerText = minutes
secondsElement.innerText = seconds
daytimeElement.innerText = daytime
}
const startTime = new Date()
const animationInterval = (callback, ms) => {
const startMs = startTime.getMilliseconds()
const scheduleFrame = (time) => {
const frame = (time) => {
callback()
scheduleFrame(time - performance.now())
}
const elapsed = time - startMs
const roundedElapsed = Math.round(elapsed / ms) * ms
const targetNext = startMs + roundedElapsed + ms
const delay = targetNext - performance.now()
setTimeout(() => requestAnimationFrame(frame), delay)
}
scheduleFrame(startMs)
}
updateTime(startTime)
animationInterval(updateTime, 1000)
</script>
</body>
</html>