script.js

const launchButton = document.getElementById("launch-btn");
const dateInput = document.getElementById("destination-date"); 
const display = document.getElementById("timer-display");

launchButton.addEventListener('click', function() {
    const userChoice = dateInput.value;

    if (userChoice === "") {
        alert("Please select your destination");
    } else {
        setInterval(function() {
            const now = new Date();
            const destination = new Date(userChoice);
            const delta = destination - now;
            const totalSeconds = Math.floor(delta / 1000);     
            display.innerText = "T-Minus: " + totalSeconds + " seconds";
        }, 1000);
    }
});