Is "Attack on Titan" taking place in the past or in the future?


According to the prehistory timeline on
[Wikia](https://attackontitan.fandom.com/wiki/Timeline#Prehistory),

>   * **1003 B1** : As a young girl, Ymir Fritz gains the power of the Titans
> from an unknown source, becoming the Founding Titan. With her powers, she is
> able to turn her subjects into Pure Titans.
>
> The Fritz family comes into power as the royal bloodline of Eldia, destined
> to remain unbroken for the next 2,000 years.
>
>   * **990 B1** : For unknown reasons, Ymir Fritz dies 13 years after
> inheriting her power. Her "soul" is split between Nine Titans that are
> inherited by nine Subjects of Ymir, with the Founding Titan belonging to the
> Fritz family and the eight remaining Titans leading clans subservient to the
> Founding Titan. Those who inherit the power of the Titans are destined to
> die after 13 years as Ymir did due to a phenomena called the "Curse of
> Ymir."
>
> The Nine Titans wage war against the nation of Marley, the dominant nation
> of the land, taking control of the continent and establishing the empire of
> Eldia. Eldia conquers countless other civilizations as well using Pure
> Titans as cheap weapons of mass destruction. This results in massive
> casualties and entire cultures being wiped out.
>
>   * **Unknown** : Eventually, in-fighting breaks out between the various
> Eldian families for control over the eight Titans, but the Fritz family,
> using the power of the Founding Titan, maintains balance.
>
> The Ackerman family, an Eldian bloodline resulted from the Eldian Empire's
> fiddling with the Subjects of Ymir, becomes the sword and shield of the
> royal family, remaining close to Eldia's king for generations.
>
> Eldia becomes allies with Hizuru.
>
>

When the Titans arrived on Earth, what year is it?




Let’s say in my opinion, _Attack on Titan_ takes place currently in the year
2350...

Also, " **X** " stands for "when Titans arrived":

  * Prehistory (Beginning of time until Zero Before X)
  * 990 years Before X - the Great Titan War begins
  * Zero years Before X - the Titans arrived

History (Zero Before X to 835 After X)

  * 743 Years After X (2243) - the Great Titan War ends
  * 835 Years After X (2335) - Eren and Mikasa are born in Wall Rose

The story of _Attack on Titan_ (835 to 854 After X)

  * 845 Years After X (2345) - Wall Maria is invaded by the Titans
  * 850 Years After X (2350) - _Attack on Titan_ takes place
  * 851 Years After X (2351) - Wall Maria is set out for the First Time
  * 854 Years After X (2354) - The Future of _Attack on Titan_

