JSFiddle - React, Tailwind, and code Playground

JavaScript

function countdown(dateStr, display) {
  let targetDate = new Date(dateStr).getTime()
  let timer = setInterval(function() {
    let now = new Date().getTime(),
        diff = targetDate - now;

    let hours = Math.floor((diff % 86400000) / 3600000),
        minutes = Math.floor((diff % 3600000) / 60000),
        seconds = Math.floor((diff % 60000) / 1000);

    document.body.innerHTML = `${hours}:${minutes}:${seconds}`
  })
}


countdown('2033-02-10 00:00:00')