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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"));