Archive of Our Own ^beta

Summary:

In a different world, where everything happens slightly later, Harry is born in the 2000s and never receives his Hogwarts letter. He lives life like a normal muggle until on his 17th birthday, he's kicked out by the Dursley's. But on his way to crash at a friend's, he gets a different type of crash. As in a bus hitting him.
He wakes up in an odd looking hospital and oddly dressed people. Turns out he's been transported to the 1940s, and not only that, but magic is real!
Because of legal issues he doesn't pay attention to, he's shipped off to Hogwarts with a vague backstory and left to fend for himself, hopefully not breaking up the timeline in the process.

or

Gen z Harry Potter dumped into the 1940s wizarding world and he's going to make it everyone's problem.