Countdown timer for my website

Hello, Ok, this project is for a javascript guru. I'm looking to incorporate a countdown clock on my website. It should display how many days, hours, minutes, and seconds are left to the event. When the event is reached, the clock should stop. I'd like to see an example of this. Second, Is it possible for the countdown clock to reset itself every couple days or so? After seeing this small demonstration, the successful bidder will be asked to work this clock into my website. I'll provide more specifics where it needs to be placed, size, how it needs to look like, etc. This is a great opportunity for someone who's looking to work with me long term, as there are other functions and features that I'd like to add on and make various updates to my website. thank you.