We want to create a Count Down Clock which in real time counts down to a given date.

I think this function needs to be a combination of Php & JavaScript or Ajax.
But since there is no forum for Php & JavaScript combined, I am posting this question here.
No JQuery please.

So say launch date is $launch_date = 'May/1/2013';

What we want then is the code which would display to a person visiting this page the message:

Launch Date: 31 Days - 23 Hours - 4 Min - 45 Seconds

With the counter for Seconds, Minutes, etc. clicking down in real time toward the launch date.

Thank you for your suggestions.