Develop Countdown Script

We need a countdown script develop. The web page would count down to a particular date, counting down days, hours minutes, and seconds. And when it gets to the countdown date it should automatically redirect to another page without requiring a browser refresh. Note: Javascript uses the local date/time but this script needs to countdown on a specific date from a specific timezone, so that anyone using the script from any part of the world or any timezone get's the exact same countdown. There should be nothing to configure for the user, just visiting via a browser from anywhere in the world should start the countdown. You are free to use a combination of php, javascript, and ajax if required (or any/all of the above). The redirect would be going to a php page.