Escuela Certus

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


const timestampDiff =
    future =>
    /** @param {number} past */
    past => [DAY, HOUR, MINUTE, SECOND].map((time, index, times) => {
        const diff = future - past;
        const previousTime = times[index - 1];

        return (
            Math.floor(diff / time) -
            (Math.floor(diff / previousTime) * (previousTime / time) || 0)
        );
    });


const timer =
    date =>
    /** @param {HTMLElement} target */
    target => {
        const diff = timestampDiff(Date.parse(date));

        return setInterval(() => {
            const [days, hours, minutes, seconds] = diff(Date.now());

            target.innerHTML = `
                <div><span>${days}</span><small>DÍAS</small></div>
                <div><span>${hours}</span><small>HORAS</small></div>
                <div><span>${minutes}</span><small>MINUTOS</small></div>
            `;
        }, SECOND);
    };

const interval = timer("mar 31, 2025 06:59:59")(document.querySelector("#timer"));