Kinda, not really. You can’t undo anything that’s already been done, and what you decide to do to change things already happened, so there’s not a lot of major change you can do. You’re throwing pebbles into a river and attempting to change its course. Maybe if all the wizards used the time turners at once they might be able to change what a day max? I don’t remember what the limit of the time turners was, but either way, she didn’t implement them well, which is why I think she destroyed all of them in book 5