Trying to figure out how to make a countdown timer...

Okay, so I finished my Java class for the semester (I got an A) =) and I'm trying to learn to make a countdown timer in my spare time. I just want something that I can add the date and time of what I'm counting down to into it and then just a simple GUI that sits on my desktop counting away. Of course the problem is I've never used time before in any of my assignments and so I'm really not sure how any of it should work. Anyone know any tutorials or methods/classes that could help me with something like this?
Thanks

I made something similar to that, it counts down in either seconds/minutes/hours/days to a specific date. I ended up doing a Google search and found a useful class called DateUtil that someone had written. It was very useful for doing all the nasty Calendar work and that kind of thing.
Besides that, the GUI should be really easy, especially if you have already done a semester of Java. I used an uneditable TextField.
Anyhow, I can put up some more detail if you need it, just ask.

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