Did you ever see The Butterfly Effect? The one with Kelso from the 70s Show, right before he turned into Ashton Kutcher? If not, definitely watch that instead. But if you have, it’s probably been quite a while, and you may be ready to walk that territory again. Project Almanac is an MTV movie about a bunch of high school students who find themselves via quirks of causality in possession of the ability to time travel.
Then, they use it to do the kinds of things high school students as envisioned by MTV would do (pass chemistry, go to Lollapalooza, you know), until, inevitably, things start to go wrong. Which is what the movie is really about.
I liked it well enough, probably because of how much I liked the other movie in the first place? I assume it was meant to be neither an indictment nor a non-judgmental representation of how high school popularity works, but instead accidentally represented and indicted that process. And from a time travel logistics perspective, well, I had issues. They used and tossed out causality pretty much at whim, which is annoying simply because time travel logic needs to be internally consistent. Pick your method, but then stay there. That’s all I ask.
Like I said, the only reason to watch this is if you can’t watch the Butterfly Effect for the first time instead. Not because Project Almanac was bad; it wasn’t. It just wasn’t nearly good enough.