23:59:60 2005 December 31
It seems that we will have an extra second this year (NPR, links to a page containing a link to audio of an interview). The extra second will be 23:59:60 Coordinated Universal Time, or 6:59:60 PM here on the east coast. The reason for the added time is to keep uniform time within 0.9 seconds of the Earth’s rotational time. This is the first time in seven years that a second has been added. Not sure what I’m going to be able to do with this extra second, but it is interesting none the less (well, maybe not too interesting).