Got a Chance to Start Again (I was born for this)

Harry stared at the date on the paper. He blinked. It didn’t change. He blinked again. Nope, it still said the same thing.
“That... that can’t be right.” Harry choked out.
The date— June 5th, 1976— taunted him from the page.

During the battle in the Department of Mysteries, Harry pushes Sirius out of the way of Bellatrix's spell and falls through the Veil instead. When he wakes up, he doesn't know what to do. Especially when he finds out that he's somehow been thrown thirty years into the past.