I don't believe travel backwards in time is possible (nor do most of the scientific community) but the concept of space time and the fact that to plot an object in space you need to know it's x y z and time it could be considered a dimension. Except that in all other dimensions we can freely move around except for time, in which we can only move forward and never backwards. So is it still a dimension of measurment if it only goes one way?

 That's an interesting idea but time is not an illusion. In order to plot the position of any object in the history of our universe you have to know where it's position is on the x y and z planes as well as the time it will be there.

Relativity and Einsteins theories on space time are the best working explanation we have found for the fundamental laws of the universe and they incorporate time as a concrete thing, not an existential illusion.  

Kodack : Time to me is more relevant than space, because points in space are located in light years (relative time it takes for light to travel from stars to us) translated to the spacial dimension of distance relative to our frame of reference. We do not see things in their true space-time dimensions but instead in their relative past space-time dimensions. This is true even for things that are close because it takes time for the interactions to interact with us even though they are extreemly fast. All things exist in the now dimension of time but not in the relativistic past, so to me space is sort of like three dimensional relativistic time past, and the one dimension of now links all existance. It's just my version of space-time reality with the interactions.

 True, even our view of the sun is several minutes old but what I meant was that we can move in either direction along any plane except for time, which we can only move forward on.

Kodack ! Yes, you can only move in one direction, unless you are made of antimater, this is a concept suggested by Mr.Richard P. Feynman , he picturs the electron as moving, not up and down between positiveand negative energy states, but foward and backward in time , however going backward in time may not be what one expects to happen, partly because they realy mean back in space-time events( determined by probability). This would involve moving backward in probablity of events accumulated from the destination point in space-time to the point from which you start the reversal and simplifying the entropy of the universe relative to the subject that is to move in the reverse of its inital direction.

I believe Einstein once said, "Reality is merely an illusion, albeit a very persistent one."

and

"Now he has departed from this strange world a little ahead of me. That means nothing. People like us, who believe in physics, know that the distinction between past, present, and future is only a stubbornly persistent illusion."

Even Einstein only viewed Time as a unit of measure and not as a state. Time is used to help understand what we observe.