Based on the search results, the year in which Jujutsu Kaisen is set varies depending on the specific arc or event being referred to. Here are some of the key dates and events mentioned in the search results:

• The beginning of the Jujutsu Kaisen series, when Itadori enrolls at Tokyo Jujutsu High, takes place during June 2018.
• The prequel movie, Jujutsu Kaisen 0, is set in the years 2016 to 2017.
• The current story arc of Jujutsu Kaisen season 2 is a flashback to Satoru Gojos past as a student, and is set in the year 2006.
• The Star Plasma Vessel incident, which involves Gojo and Suguru Geto as students at Tokyo Jujutsu High, occurs in 2006.
• Yuta Okkotsus childhood friend Rika dies in 2011.

Therefore, it is difficult to give a definitive answer to the question of what year Jujutsu Kaisen is set in, as the timeline varies depending on the specific arc or event being referred to.