Can SpaceTime Jutsu users do time travel? We know that Obito's Kamui, Tobirama/Minato's Flying Thundergod are SpaceTime jutsus. They are using the fourth dimension to go to any/marked places at will. As per physics &amp; Theory of relativity, if you have mastered the fourth dimension you can do both Space AND Time travel. Why can't they do time travel when they can do space travel ?
To time travel, one needs to be faster than light. While those ninjas use Time-Space Jutsu, none of them are faster than light.

Obito

Of the three, Obito is the slowest as his space-time jutsu (kamui) has some delay, proven by Kakashi's successfully landing attack on him before he managed to disappear.

Senju Tobirama &amp; Namikaze Minato

Both are very fast. Minato can even teleport to one of his marked kunai. I'm not sure if Tobirama can also do that, I don't remember. But the point is, although they are incredibly fast, they are not faster than light. We can safely say this, because if they are faster than light, then Minato wouldn't have his arm ripped by Madara and Tobirama won't be pinned on the ground. They would have been able to avoid Madara's attacks if they are faster than light. Thus, they cannot time travel.

Other possible ways to time travel that I know is by the use of Wormhole, which doesn't exist in Naruto universe.