According to the German historian Heribert Illig, the year 613 was immediately followed not by 614 but by 912, and great historical figures of the early middle ages, such as Holy Roman Emperor Charlemagne (742-814), simply never existed. The "phantom time hypothesis", first outlined by Illig in 1991, proposes that when Julian calendar was replaced in 1582 by the Gregorian system after more than 1,600 years, it was out of sync with the solar year by 13 days, not the ten days for which it adjusted. Illig eventually worked out that along with other"missing periods" in history, this accounted for 298 years that never existed. So it's actually the eighteenth century right now.
This is a story from This book will make you sh!t yourself Credit goes to the author James proud