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How to build a Countdown clock with days, hours, minutes, and seconds?

Hi guys,
New to the forum here. I just got finished building the LED light bar from this instructable: https://www.instructables.com/id/SLULFKFFGRLD2TE/. It's very cool and easy to put together. I'm definitely going to build a couple more.

I found that one on accident while I was here looking for another kind of project, and I'm hoping somebody with enough smarts can put a tutorial together for me and anybody else.

I'm looking for a countdown clock that is programmable. It should be able to count down to a specific time, and include days, hours, minutes, and seconds in this format - ddd:hh:mm:ss. I found an example on google images: http://sportsaffiliates.learfieldsports.com/files/2009/07/countdown-to-kickoff-clock.jpg.

I don't need it to be huge or anything. I've been looking for a how-to on building something like this for a while now. Any help would be greatly appreciated.

Thanks!

I built a couple for customers around 1999 funnily enough. I'll take some pictures of mine and put them here, or in an instructable.
jcarver27 (author)  steveastrouk7 years ago
That would be awesome. Thanks for anything you can add :)
Try this.

Sorry, it IS 10 years since I did it !

https://www.instructables.com/id/A-countdown-clock-with-LEDs/

I'll dig out the program code if you like.

Steve