Implementing a Countdown Timer on a Form – Anyone Done This Before?

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Hi,
you can use the html attribute.
Below is a sample code, in place of the date insert a reference to the date that will designate the end of time.
Regards

-----the form cuts off part of the code, the entire screen is




function startCountdown(targetDate) {
let countdownElement = document.getElementById("countdown");
let targetTime = new Date(targetDate).getTime();

let interval = setInterval(function () {
let now = new Date().getTime();
let timeLeft = targetTime - now;

if (timeLeft <= 0) {
clearInterval(interval);
countdownElement.textContent = "End of Time!";
return;
}

let days = Math.floor(timeLeft / (1000 * 60 * 60 * 24));
let hours = Math.floor((timeLeft % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
let minutes = Math.floor((timeLeft % (1000 * 60 * 60)) / (1000 * 60));
let seconds = Math.floor((timeLeft % (1000 * 60)) / 1000);

countdownElement.textContent = `${days}d ${hours}h ${minutes}m ${seconds}s`;
}, 1000);
}

startCountdown("2025-12-31T23:59:59");