What are YOU going to do with your extra second of time on New Year's Eve? You know the buzz...New Year's will be arriving a second later this year. Why you say and what's the big deal? Well, it seems that sometimes clock time and sun time get out of step with each other. This extra second helps all of that fall into place. Why bother? Well, imagine what would happen as those seconds added up "over time." There's even a wiki article on the leap second.
Link to Article
If you want to get really technical about it you can read the Navy article on the subject.
Enjoy your extra time off before going back to work!!!