A pair of Time-Turners were created by Theodore Nott while he was working for Lucius Malfoy. There were two in total, and they were not restricted by an Hour-Reversal Charm, allowing one to travel back years or even decades.
Professor McGonagall gave Hermione Granger the Time-Turner at the start of her third year, allowing her to take multiple classes that overlap and would be impossible to attend in real-time.
Time-turners were only used in "Prisoner of Azkaban" to save Sirius, raising questions about their potential and limitations. J.K. Rowling addressed the time-turner plot holes by introducing limitations on time travel and ultimately destroying all time-turners.
Never in the books was it stated that every time-turner was destroyed. The closest is a conversation with Hagrid in HBP, where he jokes that they would have struggled to fit in Care, even with Time Turners. In response, Hermione replies stating "We smashed the entire stock of Ministry Time-Turners".
The theory suggested that nothing in the past could be changed. Time travelers could only relive a moment from a different perspective. This was reiterated when Hermione and Harry used the Time-Turner to rescue Sirius Black and Buckbeak.
Time Travel In Harry Potter Explained (+History Of Time Turners)
Is the Time-Turner illegal?
Time-Turners are potentially dangerous contraptions, and thus are protected by the Ministry of Magic, who only give them out in very special circumstances. Professor McGonagall had to write many letters to the Ministry of Magic before they allowed Hermione to have one.
Why didn't they use Time-Turner to stop Voldemort?
In conclusion, Harry couldn't go back time and kill Voldemort because of the Novikov's Self-Consistency principle and how the Time-Turner works in the Predestination Timeline.
If my memory is right, the time turner can only go back in time five hours, so by the time he started his evil reign it was far too late to use one, since he already had several horcruxes.
Why didn't Dumbledore use the Time-Turner to go back and save Harry's parents? Because it's too dangerous to go further back than a few hours. Why didn't anyone use the Time-Turner to save the lives lost in the final Battle of Hogwarts? Because by that point, no more Time-Turners were left in existence.
Honestly, Hermione knew Dobby was a lost case... nothing could have revived Dobby after the attack or she would have definitely helped Harry with Dobby considering she was the girl who started S.P.E.W(Society for the Elfish welfare) and fought for elf rights. There was nothing to be done at that point.
A great example of this was his feud with Grindelwald, where, once their blood pact was broken, he finally could defend against the dangerous wizard. But his actions could've also been fueled by a gift he gained where he could revisit moments thanks to a Time-Turner.
Hermione got rid of the Time-Turner: she only used it to be able to take as many classes as she pleased, and ultimately she felt like she stretched herself too thin.
Hermione explains that the hourglass is a Time-Turner; she has been using it all year to get to all her classes. Professor McGonagall instructed her to tell no one about it.
The user might still age while within an hour produced by the Time-Turner, and if so, then for wizards or witches such as Hermione, constant use might age them faster, adding days, weeks, or even months onto their internal chronological clock. It is also unknown how this applies to later on in life.
History. This broomstick was arranged for Harry by Professor Minerva McGonagall after he was given a spot on the Gryffindor Quidditch team, as Seeker. He rode this broom in all school Quidditch matches until 1993, when, during a match against Hufflepuff, he was attacked by Dementors and fell off his broom.
In Harry Potter and the Cursed Child, Harry's son, Albus Potter, and his best friend, Scorpius Malfoy, used a Time-Turner to go back in time to the Triwizard Tournament to save Cedric Diggory's life.
Why didn't they use a Time-Turner to save Harry's parents?
Why the Time Turner Couldn't Have Saved Harry's Parents | Fandom. The time turner couldn't have been used to save Harry's parents because it was too far back in time; you cannot go back more than five hits without there being very bad consequences. They saved Buckbeak because he was about to die three hours before.
In Harry Potter and the Cursed Child, it is revealed that Bellatrix gave birth to Voldemort's daughter Delphi in Malfoy Manor before the Battle of Hogwarts.
Why didn t Hermione use the Time-Turner to save Sirius?
Changing the past is hazardous and apparently nigh impossible. Buckbeak could be rescued because he already had been rescued, while Sirius was seen to have died by several witnesses. Even if it were possible, Hermione only had the Time Turner for one year.
The simplest thing is just to quote it: Hermione says she used the Time Turner to attend several classes at once, and for the first two terms of the year she's taking all twelve subjects when normal students take nine. Around Easter she drops out of Divination, and at the end of the year she drops Muggle Studies.
Dumbledore's lack of belief that Sirius is innocent is also suspect. Sirius was a member of the Order of the Phoenix which fought against Death Eaters, but Sirius also was as close to James as a brother, the Potters even took him in when he ran away from home.
Therefore, Snape could have accused Harry and Hermione that they used it to go back in time to free Sirius if he'd known about the time-turner. So the only teachers who knew about it would be Dumbledore and McGonagall.
