I want my "difference" to be an array with multiple dates. But date that is chosen should also be their date that's used below.

const difference = +new Date(`01/01/${year+1}`) - +new Date();

let timeLeft = {};

if (difference > 0) {
  timeLeft = {
    days: Math.floor(difference / (1000 * 60 * 60 * 24)),
    hours: Math.floor((difference / (1000 * 60 * 60)) % 24), 
    minutes: Math.floor((difference / 1000 / 60) % 60),
    seconds: Math.floor((difference / 1000) % 60)
  };
}