Sword Art Online Timeline

2008

 * Kazuto is adopted by the Kirigaya family after his birth and his parents' death

2018

 * Kazuto finds out about his parents' death

September/October

 * Asada Shino is involved in a bank robbery

May

 * The NerveGear is created

August

 * Start of the Sword Art Online Closed Beta.

September

 * End of the Sword Art Online Closed Beta.

November 6

 * Start of Sword Art Online Official Server Service.
 * Kirito shows Klein the ropes of the game.
 * 17:30 Aincrad Standard Time - Kayaba Akihiko successfully traps 10,000 Players in the game.
 * 213 people died because of family/friends remove NerveGear from their head.
 * Kirito parts ways with Klein and heads to Horunka Village.
 * Kirito goes off to complete the «Secret Medicine of the Forest» quest. He meets Coper, another beta tester. Coper tries monster PK Kirito only to end up dying himself.

After November 6

 * The guild Aincrad Liberation Force was started.

December

 * Suguha finds out about Kazuto’s parents’ death.
 * 2000 people had died from playing Sword Art Online.
 * The top class proto-front-lines group is barely level 10 on average.

December 2

 * Kirito meets Asuna.
 * The First Floor Boss Strategy Meeting is held in the Town of Tolbana.

December 3

 * Diabel's party finds the First Floor Boss Room.
 * The second First Floor Boss Strategy Meeting was held. Asuna temporarily joins Kirito's party.
 * Asuna borrows Kirito's bathroom.

December 4

 * 10:00 Aincrad Standard Time - The First Floor Boss Raid Group bands together.
 * Kirito deals the Last Attack on Illfang the Kobold Lord. He gains the Coat of Midnight as a bonus.
 * The term Beater was created.
 * Kirito opens the teleport gate to the second floor. The first Town Opening is held.
 * Kirito helps Argo out. He starts the acquisition quest for the Martial Arts Extra Skill.

December 7

 * Kirito completes the acquisition quest for the Martial Arts Extra Skill.

December 8

 * Asuna forces Kirito to help her hunt «Needle of Wind Wasp».

December 14

 * The second floor boss is defeated.
 * Asuna and Kirito party together. With Kirito's help, Asuna defeats the Dark Elf.

2023

 * Konno Yuuki begins using the MediCuboid

April

 * Kirito joins the guild Black Cats of the Full Moon
 * Lead Group makes it through the 28th Floor, according to the Weekly Argo newspaper

May

 * Creation of AmusSphere and ALfheim Online

June

 * Disappearance of the "Black Cats of the Full Moon"

October-November

 * Kirito acquires the unique skill "Dual Blades"

November

 * Suguha joins ALO

December 24

 * Kirito defeats the event boss Nicholas the Renegade
 * Kirito receives a Timer-Activated Message Record Crystal from Sachi

January

 * Birth of the red guild "Laughing Coffin" (January 2024, SAO)
 * Kirito acquires the sword Elucidator from a rare drop.

February

 * Volume 2 - "Black Swordsman" (February 2024, SAO)

March

 * ME1 - "The Progressers" (March 2024, SAO)
 * Duel between Asuna and Kirito (March 2024, SAO)
 * 57th Floor of Aincrad (March 2024, SAO)

April

 * Serious meeting between Asuna and Kirito (April 2024, SAO)
 * Volume 8 - "A Murder Case in the Area" (April 2024, SAO)

June

 * Volume 2 - "Warmth of the Heart" (June 2024, SAO)
 * Kirito acquired the sword "Dark Repulser" (June 2024, SAO)

August

 * Gaiden - "Sound of Water, Sound of Hammer" (August 2024, SAO)
 * Coalition against "Laughing Coffin" (August 2024, SAO)
 * 74th Floor of Aincrad (August 2024, SAO)

September

 * ME4 - "Cold Hand, Warm Heart" (September 2024, SAO)

October

 * Volume 3 - Beginning of Prologue (First days of October 2024, IRL)
 * Volumes 1, 2 - Prologue (October 2024, SAO)
 * Volume 1 - Chapter 1 (End of October 2024, SAO)
 * Volume 1 - End of Chapter 4 (End of October 2024, SAO)
 * Volume 1 - Chapters 5-12 (End of October 2024, SAO)
 * 75th Floor of Aincrad (End of October 2024, SAO)
 * Volume 1 - Chapters 12 and 13 (End of October 2024, SAO)
 * Kirito joined the "Knights of Blood" (End of October 2024, SAO)
 * Volume 1 - Chapters 14-16 (End of October 2024, SAO)
 * Gaiden - Chapter 16.5 (End of October 2024, SAO)
 * Volume 2 - "Morning Dew Girl" (End of October 2024, SAO)
 * Appearance of Yui (End October 2024, SAO)
 * ME6 - "Algade Showdown" (End of October 2024, SAO)

November

 * Volume 1 - Chapters 17-19 (November 2024, SAO)

November 7

 * Volume 1 - Chapters 20-24 (November 7th, 2024, SAO)
 * SAO Deleted (November 7th, 2024)
 * Death of Kayaba Akihiko (November 7th, 2024)
 * Volume 1 - Chapter 25 (November 7th, 2024, IRL)
 * End of Aincrad
 * Volume 3 - End of Prologue (November 7th, 2024, IRL)

2025

 * ME5 - "Salvia" (January 2025, IRL)
 * Volume 3 - Chapter 1 (19-20 January 2025, ALO)
 * Volumes 3-4 - Chapters 2-5 (January 2025, ALO)
 * "Excaliber" found (January 2025, ALO)
 * Volume 4 - Chapters 6, 7 (January 2025, ALO)
 * Volume 4 - Chapter 8 (January 2025, ALO/IRL)
 * Creation of "Seed" (January 2025)
 * Sugou Nobuyuki Arrested (January 2025, IRL)
 * ALO Suspended (January 2025)
 * Akihiko Kayaba's whereabouts (March 2025, IRL)
 * Volume 4 - Chapter 9 (May 2025, IRL/ALO)
 * End of Fairy Dance

GGO

ALO
 * Gun Gale Online Created (April 2025)
 * Meeting between Shinkawa Kyouji and Asada Shino (June 2025, IRL)
 * Shino joined GGO (June 2025, GGO)
 * Shino acquired "Ultima Ratio Hecate II" (June 2025, GGO)
 * 1st “Bullet of Bullets” (August 2025, GGO)
 * 2nd “Bullet of Bullets” (October 2025, GGO)
 * Volume 5 - Prologue (November 9th, 2025, GGO)
 * "Death Gun" Murders (November 2025, IRL)
 * Volume 5 - Chapters 1, 2 (December 7th, 2025, IRL)
 * Volume 5 - Chapter 3 (December 11th, 2025, GGO)
 * Volume 5 - Chapters 4-6 (December 13th, 2025, IRL/GGO)
 * 3rd “Bullet of Bullets” (December 2025, GGO)
 * Volume 5 - Chapter 7 (December 13th, 2025, GGO)
 * Volume 6 - Chapter 7.2 (December 14th, 2025, IRL)
 * Volume 6 - Chapters 8-10 (December 14th, 2025, IRL/GGO)
 * Volume 6 - Chapters 11 (December 14th, 2025, ALO)
 * Volume 6 - Chapter 12 (December 14th, 2025, GGO)
 * Volume 6 - Chapter 13 (December 14th, 2025, ALO)
 * Volume 6 - Chapters 14, 15 (December 14th, 2025, GGO/IRL)
 * Shinkawa Brothers arrested (December 14th, 2025, IRL)
 * Escape of Atsushi Kanemoto (December 14th, 2025, IRL)
 * Volume 6 - Chapter 16 (December 16th, 2025, IRL)
 * End of Phantom Bullet
 * Sinon joined ALO (December 16th-21st, 2025, ALO)
 * Volume 8 - "Caliber" (December 28th, 2025, ALO)
 * Kirito acquired the sword "Excaliber" (December 28th, 2025, ALO)
 * Lisbeth acquired the hammer "Mjölnir" (December 28th, 2025, ALO)

2026
ALO Underworld
 * Volume 7 (January-April 2026, ALO/IRL)
 * End of Mother's Rosario
 * ME3 - "Ceramic Heart" (May 18th, 2026, ALO/IRL)
 * Accel World Volume 10 - "Versus" (April 2026 // 2047, Brain Burst)
 * Volume 9 - Alicization Beginning (June 2026, UnderWorld)
 * Volume 10 - Alicization Running (July 2026, UW)
 * Gaiden - "Cradle of the Moon" (??, UW)
 * Gaiden - "There is but one Ultimate way" (August 2026, UW)