According to that link, time is not a dimension because you cannot travel through time, but in reality, we ARE traveling through time. Right now I am traveling through time. I might not be traveling at an abnormal rate, but I'm traveling through time nonetheless.

Traveling backwards through time is not possible, as the previous has already happened, but traveling forward in time is quite possible, as everyone on earth is proving right now. As you travel closer to the speed of light, you travel through time slower, gradually reaching the point where you are no longer traveling through time at all. It's my guess that it is impossible to reach this point, since if you did, you would just be stuck, since if you aren't moving through time, you cannot move through space either. Anyway, the point is, the faster you are traveling through space, the slower you are traveling through time. Back to relativity.