Native title: 時をかける少女
Also Known as: Toki o Kakeru Shojo , The Girl Who Leapt Through Time
You can watch it from here.
I have only seen the anime version of this, and it is A LOT different than the movie (LA) version.
It was not bad, it could have been better though, for me. The last part is what I liked most but the rest I find the pacing too fast. I would have probably enjoyed this more if it was made into a drama instead of a movie. I felt that they were rushing things to fit it all in just a 2 hour or so movie.
I would still recommend watching this as the concept of the story was really good.