javascript timer based on world clock?

hey guys, is it possible to fire a function (every second开发者_如何学Python or every 500ms) based on a global world clock or something? I need a simultaneous time on each computer that opens this script!

any idea how to solve this?

regards

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You would need to get the world time with some server implementation.

Then you could either decrement it with some setTimeout function with a time-- on the time,
or you could decrement it with some ajax call back to the server which would get the exact time again (also with a setTimeout or setInterval timer)