I'm going into the future right now, I'm travelling through time
K, now I'll being serious:
Time technically divides infinitely so to go back in time you would have to plot infinite coordinates which I think is highly impossible.
As Albert Eistein said before, there is no direct space and time. It isn't definite because according our movement speed, time around us travel at different speeds. A person travelling at the speed of light would age slower than anyway except the people travelling at the exact speed. I, myself sometimes can't feel the existence of 'time' it is just based on the movement of things around. Humans just invented it to be easier to record things. Our seconds are really just based on the movement of the hands on the clock, which also is a human invention.
This is based on the theory of relativity, which Eienstein suggests everything in the world is relative. You can't measure something accurately, for example a car travelling 60 kmph or 36 mph is based and compared to the the the ground which appears to be stationary. However, the ground which is the earth is travelling at 3km per second. The car compared to space therefore travels at about 3 km per second compared to the space around it. The fourth dimension suggested by Eienstein which is Time has a similar relativity rule based on it.
In other words, its practically impossible...Why? The reason is time cannot be counted, humans just build mechanical equipments based on movements for calculations of time. There is no present, present is just the ignorance of human race to take into account of the molecule movments, different speeds everything is moving and different dimensions our universe counter at the same time.
Love Eistein, one is his theory said "time travel" is impossible, and this is based on mathmatical calculations and not based on what people's opinions are a few centuaries ago. However, time halting or stopping is possible which I said before is fundamentally travelling at the speed of light.
--- can't be bothered typing the rest of my views ---
Not proof read. Too lazy to read thru this blabbering post