20X1 year
　The number of days in parentheses is the number of days since he became the Demon King.

　July 15 : All of humanity will receive the aptitude survey emails at once (episodes 1 - 2).

　July 16 : The mastermind lectures Chaos on the World Salvation Project. (Episode 3)

　July 17 : Humanity selected by [Chaos] to become the Demon King. (Episode 4 -)
(Day 1) Dominant territories (inviolable zones) emerge around the world.
　Commonly known as "The Great Transformation".

　August 16: The pseudo-peace is lifted in all of the Dominion Territories. (Episode 11)
(Day 30) "Revelation of the Goddess" to humanity selected by [Rowe] (Gaiden, Episode 1 (Rina Sayama))

　August 19: University students led by Ando invade Theon's controlled territory. (Episode 12)
(Day 33)

　August 23: The Realm of Zion's Dominion, a full house. (Episode 15)
(Day 37)

　September 6: Theon's level grows to 2. (Episode 16 - )
(Day 51) Some of the realm evolves.
　A demon appears outside the dominion area.

　September 17: Selected members of Kanazawa City released their control area. (Gaiden Episode 5 (Rina Sayama))
(Day 62)

　September 18: Theon grows to level 3. (Episode 20)
(Day 63) Evolved into a demon king (bloodsucker). (Episode XXII)
　The birth of Chloe, my household. (Episode 20)

　October 3: The canon surrenders to Zion.
(Day 78)

　October 25: Beginning of Episode 36
Day 100.

　October 30: Selected members of Kanazawa City release the fourth control area. (Gaiden Episode 5 (Rina Sayama)
Day 105.

　October 31: Kanazawa City Selected members invade the territory controlled by Zion.
(Day 106)

　November 9: Zion successfully invades (and controls) the controlled territory for the first time. (Episode 54)
(Day 115)


　20X2 years
　Mid-May: Theon, Kanta, and Arisa become the three Demon Kings present in Kanazawa City. (Episode fifty-five)
　The invasion begins against the territory controlled by Demon King Kanta. (Episode 56 - )

　Late May: successful invasion of Demon King Kanta's dominion territory. (Episode 62)
　The invasion begins against the territory controlled by Demon King Arisa.

　Early July: the war with Demon King Arisa is won. (Episode 84)
　Theon evolves into the Demon King (Vampire Lord).

　Late July: he takes Sabraw under his command. (Episode 93)

　Early August: the invasion begins against the territory controlled by the Demon King Yataro. (Episode 96)

　Mid-August: The Demon King Yataro is assigned to him. (Episode 103)
　Logging into Laplace for the first time. (Episode 107)

　Early September: invaded by the Demon King Sarah. (Episode 110)

　Mid-September: Sarah, the Demon King, is added to his staff. (Episode 113)

　Late September: the Demon King Takahar is added to his staff. (Episode 118)

　Early October: Lina grows to level 50. (Episode 119)

　Mid-October: Setanta is created in The Creation of Random Numbers. (Episode 122)
　The invasion begins against the territory controlled by Demon King Akira. (Episode 123)

　Late October: subrow evolves. (Episode 126)

　Early November: the Demon King Akira is taken under his command. (Episode 129)
　Zion performs the Reign for the first time.

　20X3 years.
　Late March: The Demon King Hibiki is taken under his command. (Episode 140)

　Early May: Invasion of Suzu City begins (Episode 141 -)

　Late May: the Kotets are placed under their control. (Episode 158)

　Mid-June: Successful invasion of Suzu City Hall. (Episode 164)

　Early July: unification of the north of the province. (Episode 167)