2005 will last a little longer than usual -- one second to be precise.
A leap second will be added into the world's clocks just before midnight to match up the clocks with the earth's rotation.
This will be the first leap second in seven years and the 23rd since 1972 when an international timekeeping agreement was signed.
Leap seconds are necessary because modern atomic clocks are extremely accurate while the earth's rotation has been slowing down because of tides.
The clocks establish the official time, which is known as Coordinated Universal Time, for the world.
Just in case they want to make any last second changes, they finally can.