Yes, Albert Einstein has come up with Special Relativity, explaining that if an object moves at almost 3.0x10^8m/s, c, or just speed of light, it can distort time by small margins. However, time distortion in large scale (anywhere between a year to hundreds of years) seems very unlikely. Logically speaking, if time machine does exist in the future, then the present and the past should be already filled with people from the future. The distinctive line between "past, present and future" will no longer exist with the time machine. Also, time traveling goes against the laws of conservation.
Not only do I don't think it will not exist, I also believe it should NOT exist. The misuses of time machine can be limitless. For instance, every student would not need to study for a final exam because they can just find out the answers in future. Scientists do not need to discover or research anything because they can just go in the future and find out.
Although time traveling has always been a heated topic in science fictional fields, it should be noted that if invented, it will surely be the most dangerous machine known to men. It will disrupt nature, human history, and human existence. Who knows what can happen if you let yourself change the past or change the future?