Time doesn't have much meaning on the quantum scale. If you fly an atomic clock around the world, it will go slower than a stationary one (this has been done, and within the next couple years they're going to put one on the ISS). Time doesn't work the same at that level.
And atoms can be split, and subatomic particles can be split, and those can be split... eventually you'll get down to pure energy, where matter as we know it doesn't exist... time is similar.