Use javascript to countdown to a specific date, produce a message, and reset to the following year after the date. Replace `<tag>`s.

countdown.js

// Replace:
// <event> for the event name, no spaces (FirstLetterCapitalized)
// <month> for month number (January is 0)
// <day> for day number
function updateCountdown() {
    const now = new Date();
    const currentYear = now.getFullYear();
    
    // Check if today is <month>.<day>
    if (now.getMonth() === <month> && now.getDate() === <day>) {
        document.getElementById("countdown").textContent = `0 Days - It's <event>!`;
        return;
    }
    
    // Define <month>.<day> of the current year
    let eventDay = new Date(currentYear, <month>, <day>);
    eventDay.setHours(0, 0, 0, 0); // Set to beginning of the day for consistent calculations
    
    // If <month>.<day> has already passed this year, target next year's <month>.<day>
    if (now > eventDay) {
        eventDay = new Date(currentYear + 1, <month>, <day>);
        eventDay.setHours(0, 0, 0, 0);
    }
    
    // Calculate the time difference
    const timeDiff = eventDay - now;
    
    // Convert time difference from milliseconds to days
    const daysUntil<event> = Math.floor(timeDiff / (1000 * 60 * 60 * 24));
    
    // Update the DOM element
    document.getElementById("countdown").textContent = `${daysUntil<event>} Days until next <event>`;
}

// Run the countdown function once
updateCountdown();

// Update the countdown every hour
setInterval(updateCountdown, 1000 * 60 * 60);