Countdown Timer — Complete JavaScript Code
/* Event countdown — no library needed */
const eventDate = new Date('2026-09-15T09:00:00');
function updateCountdown() {
const diff = eventDate - new Date();
if (diff <= 0) { return; }
document.querySelector('#days').textContent =
Math.floor(diff / 86400000);
document.querySelector('#hours').textContent =
Math.floor((diff % 86400000) / 3600000);
document.querySelector('#mins').textContent =
Math.floor((diff % 3600000) / 60000);
document.querySelector('#secs').textContent =
Math.floor((diff % 60000) / 1000);
}
setInterval(updateCountdown, 1000);
updateCountdown();
Frequently Asked Questions
What should an event website include?
Event website essentials: hero with event name, date, and location prominently displayed, live countdown timer, registration/ticket CTA, speakers grid (for conferences), schedule/agenda, venue information with map embed, sponsor logos, FAQ, and a past edition section (for recurring events). Schema.org Event markup is critical — Google shows event details in search results.
How do I create an event website in HTML?
1) UIXDraft event template ($35) — countdown, speakers, schedule, and registration sections pre-built. 2) Update the JavaScript countdown with your event date. 3) Replace speaker placeholders with real photos and bios. 4) Add your schedule to the agenda table. 5) Link the registration CTA to Eventbrite, Luma, or a Formspree form. 6) Deploy to Netlify free. Time: 3–6 hours for a complete event site.
How do I add a countdown timer to an HTML event page?
Pure JavaScript — no library needed. Set `const eventDate = new Date('2026-09-15T09:00:00')`. Calculate `diff = eventDate - new Date()`. Extract days (`Math.floor(diff/86400000)`), hours, minutes, seconds. Update DOM elements with `setInterval(updateCountdown, 1000)`. Full working code in the example above — copy and paste, change only the date.
What is Schema.org Event markup?
Schema.org Event markup tells Google your page is about an event: name, startDate, endDate, location (PostalAddress), organizer, offers (ticket price), and eventStatus. Add as JSON-LD in ``. Google shows event date, location, and pricing directly in search results — significantly increasing click-through rate. Critical for conference, concert, and meetup websites.
How long should an event website be live?
Launch the event site 3–6 months before the event for maximum SEO benefit — Google needs time to index and rank it. Keep it live permanently after the event with: video recordings, slide decks, photo galleries, and write-ups. Past event content ranks for '[event name] 2025/2026' searches year-round and drives registrations for future editions.