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next.js/examples/with-unstated/components/Clock.js

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export default ({ clock: { state: { lastUpdate, light } } }) => {
return (
<div className={light ? 'light' : ''}>
{format(new Date(lastUpdate))}
<style jsx>{`
div {
padding: 15px;
display: inline-block;
color: #82FA58;
font: 50px menlo, monaco, monospace;
background-color: #000;
}
.light {
background-color: #999;
}
`}</style>
</div>
)
}
const format = t => `${pad(t.getUTCHours())}:${pad(t.getUTCMinutes())}:${pad(t.getUTCSeconds())}`
const pad = n => n < 10 ? `0${n}` : n