Discussion on: Simple Countdown Timer using JavaScript

[sebasencr]

Here's my take.
Simple, short, readable, and unpretentious:

const SECOND = 1000;
const MINUTE = 60 * SECOND;
const HOUR = 60 * MINUTE;
const DAY = 24 * HOUR;

setInterval(() => {
    let diff = Date.parse("Oct 31, 2023 20:00:00") - Date.now();
    const days = Math.floor(diff / DAY);
    diff -= days * DAY;
    const hours = Math.floor(diff / HOUR);
    diff -= hours * HOUR;
    const mins = Math.floor(diff / MINUTE);
    diff -= mins * MINUTE;
    const secs = Math.floor(diff / SECOND);
    document.querySelector("#timer").innerHTML = `
        <div>${days}<span>Days</span></div>
        <div>${hours}<span>Hours</span></div>
        <div>${mins}<span>Minutes</span></div>
        <div>${secs}<span>Seconds</span></div>`;
}, SECOND);