J.K. Rowling made a massive mistake on #BackToHogwarts day...

Apparently it's all the Cursed Child's fault

Yesterday, the 1st September 2016, was the day that wizards from all over the country caught the train from platform nine and three quarters, to return to Hogwarts for the new term. And of course, Harry Potter nostalgia was rife.

Fans have recently been enjoying the newly released book, the Harry Potter and the Cursed Child script, and are eagerly anticipating the upcoming Fantastic Beasts and Where to Find Them movie, which drops in cinemas later this year.

Naturally, yesterday morning Harry Potter fans everywhere took to Twitter to mark the day with the hashtag #BackToHogwarts, with hundreds of thousands of tweets posted in honour of the day. Even the series' author, J.K. Rowling, got on the bandwagon, tweeting to ask Harry Potter fans to watch out for Albus Severus Potter at the station, as he would be leaving for his first day of Hogwarts.

'If you're at Kings Cross, the Potter, Granger-Weasley and Malfoy families are there too. Albus Severus starts school today #19YearsLater' she wrote, to mark the fact that it's been nineteen years since the events of the seventh book took place.

But is it...?

It didn't take long for a lot of Harry Potter mega fans to point out that the battle of Hogwarts took place in 1998, meaning that 'nineteen years later' will in fact be 2017. So, little Albus Potter isn't actually due to board the Hogwarts Express until next year.

Ahhhhhh. That's awkward.

Fortunately though, J.K. saw the funny side of the whole thing. She quickly tweeted afterwards, 'I got the year wrong: Blame #CursedChild! In my head it's already 19 years later! #BackToHogwarts.'

It just goes to show that even globally successful authors can make mistakes sometimes, guys.

J.K. has since deleted the incorrect tweet from her account. We can't blame her, really...