Time passes at different rates depending on where you are in the Universe and how fast you are traveling. If you are near a very large object with great mass and gravity, time will slow down. For example, if you could orbit a massive black hole, time would pass much slower for you than observers on earth. Depending on the size and force of the black hole, time might pass half as fast for you as for the observers. After orbiting the black hole for 5 years and returning to earth, 10 years would have passed. This would effectively be a time machine.
Since black holes are a long way from here and not very practical to orbit, another way to time travel is by moving at the speed of light. If you could travel at the speed of light in space for 1 week, when you return to Earth, 100 years would have passed. This is very effective time travel.
It is impossible to travel at the speed of light, but might be possible to travel at near the speed of light. However, to do that the space vehicle would have to be super-massive. It might take 6 years for the vehicle to accelerate to near the cosmic speed of light. After 2 years it will reach half the speed of light. After another two it will be 90% the speed of light. After 2 more years it will reach 99% the speed of light. At this speed a single day on the spaceship is equal to a year of time on Earth.
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