Sorry, I couldn't resist once I had the idea.
Anyway, just as a public service announcement, time travel is highly discouraged by both the Ministry of Magic and the United Federation of Planets - you really just shouldn't get into that kinda thing.
For one, it's confusing.
For another, you might accidentally create a rift in the space-time continuum that destroys the entire UNIVERSE.
... Just as a totally unrelated side-note, my friends keep saying that I really need more sleep, but that's just silly. Three hours a night is MORE than enough.
:P See y'all in class!