I found Timeline to be surprisingly entertaining. It doesn't really explore the complexities of time travel, which might disappoint viewers looking for hard science fiction, but instead focuses on the historical elements and does so effectively. The story progresses at a good clip, avoiding unnecessary delays, and while the direction isn’t particularly innovative, it keeps everything clear and the action straightforward. The visuals aren't amazing, though there are some impressive landscape views and scenes that create a certain feeling. The performances are all quite good. Paul Walker has a relatable quality, and Gerard Butler adds some energy to his role. Honestly, the cast elevates the film beyond what it might have been otherwise. The story is fairly conventional and uses predictable plot devices, but I still had fun watching it. The music complements the movie well, even if it doesn’t stick with you afterward. Timeline isn't a particularly intelligent or profound film, but it's an enjoyable way to spend time if you want a quick-moving historical adventure that incorporates science fiction elements.

Source on TMDB