Sword Art Online Timeline

The Sword Art Online Timeline lists the known time and date of all the events that have occurred in the Sword Art Online series in chronological order. 10 years need to be added to the events whose date and time can only be sourced from the web version of SAO to maintain consistency.

September 30th

 * Yuuki Asuna is born.

October 7th

 * Kirigaya Kazuto (Kirito) is born.

After October 7th

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

May

 * Konno Yuuki and Konno Aiko are born and their family is infected with HIV, due to a batch of bad blood.

End of the year

 * Shino's family encountered a traffic accident, due to which her father passed away.

2016

 * Kirigaya Kazuto gives up on Kendo.

2018

 * Kazuto planted Salvia on a countryside land.
 * Kazuto finds out about his parents' deaths from the deleted entry record he found on the Internet.

September/October

 * Asada Shino is involved in a fatal robbery in a post office.

2021

 * The NerveGear is announced.
 * Japanese Self-Defense Force (JSDF) and U.S. Army start developing training software utilizing the NerveGear together.

May

 * The NerveGear is released to the market.

August

 * The Sword Art Online (SAO) Closed Beta is launched.
 * Kirito encounters Argo.

August 31st

 * The Sword Art Online Closed Beta is closed.

October 31st

 * Sword Art Online sales begin.

November 2nd

 * People start queuing up at stores for the release of Sword Art Online.

November 5th

 * Sword Art Online sales in stores begin.

November 6th

 * 13:00 JST: Start of Sword Art Online Official Server Service.
 * All players are Level 1.
 * Kirito shows Klein the basics of the game.
 * After 17:30 - 18:00 Aincrad Standard Time - Kayaba Akihiko successfully traps nearly 10,000 Players in the game. Of this 10,000, between 700-800 are beta testers. 213 people died because their family or friends attempted to remove the NerveGear from their head.
 * Kirito parts ways with Klein and heads to Horunka village.
 * 18:15 Aincrad Standard Time: Beginning of "The First Day"
 * 19:00 Aincrad Standard Time: Kirito goes off to complete the «Secret Medicine of the Forest» quest.
 * Kirito meets Coper, another beta tester and both agree to help each other complete the «Secret Medicine of the Forest» quest.
 * ~20:30 Aincrad Standard Time: First in-game death in Sword Art Online occurred. The player, Arvin, attempted to test the theory that he would regain consciousness after being disconnected from the server by jumping off from Aincrad.
 * ~20:30-21:00 Aincrad Standard Time: Coper tries a monster PK on Kirito only to end up dying himself.
 * 21:00 Kirito returns to Horunka village, finishes the quest and obtains an Anneal Blade. Kirito reached Level 4 with the completion of the quest..
 * End of "The First Day"
 * SAO Case Victims Rescue Force established. Kikuoka Seijirou joined and leaded it.

December

 * Suguha finds out about Kazuto’s parents’ death and their actual relationship.
 * About 2,000 people had died while playing Sword Art Online. Of this number, roughly 300 deaths were beta testers.
 * The top class proto-front-lines group is barely level 10 on average.

December 2nd

 * Beginning of Progressive Volume 1 Chapter 1 (Aria in the Starless Night)
 * Kirito meets Asuna.
 * 04:00 Aincrad Standard Time: Asuna loses consciousness in the 1st Floor Labyrinth due to fatigue.
 * 16:00 Aincrad Standard Time: The First Floor Boss Strategy Meeting is held in Tolbana.

December 3rd

 * Afternoon: Diavel's party finds the boss room.
 * Before 17:30 - Aincrad Standard Time - The second First Floor Boss Strategy Meeting was held. Asuna temporarily joins Kirito's party.
 * Asuna borrows Kirito's bathroom.
 * Night - Asuna obtained Wind Fleuret from a monster drop.

December 4th

 * 10:00 Aincrad Standard Time: The First Floor Boss Raid Group bands together.
 * 12:40 Aincrad Standard Time: First Floor Boss fight begins.
 * Kirito deals the Last Attack on Illfang the Kobold Lord. He gains the Coat of Midnight as a bonus.
 * The term "Beater" was created.
 * End of Progressive Volume 1, Chapter 1 - Aria in the Starless Night.
 * Beginning of Progressive Volume 1 Intermission - Reason for the Whiskers..
 * 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 7th

 * Kirito completes the acquisition quest for the Martial Arts Extra Skill.
 * End of Progressive Volume 1 Intermission - Reason for the Whiskers..

December 8th

 * Beginning of Progressive Volume 1 Chapter 2 (Rondo the Transient Sword).
 * Kirito is Level 13.
 * 15:00 Aincrad Standard Time: A certain player consecutively failed to strengthen his Anneal Blade four times at Nezha's Smith Shop.
 * Asuna persuades Kirito to help her hunt «Needle of Wind Wasp».
 * 19:00 Aincrad Standard Time: Kirito and Asuna go to eat a Tremble Shortcake together, with the expenses paid by Kirito due to him losing their challenge to kill 50 Wind Wasps first.
 * After 19:30 Aincrad Standard Time: Asuna's Wind Fleuret appeared to have vanished, seemingly because of a failure in strengthening.
 * 20:28 Aincrad Standard Time: Asuna got her Wind Fleuret +4 back.

December 9th

 * Morning - The only Field Boss on the 2nd Floor, The Bullbous Bow defeated
 * Kirito is Level 14, Asuna is Level 12.
 * Evening - Kirito and Asuna meet Argo in a pub.

December 14th

 * The second floor boss is defeated.
 * Concerto of Black and White takes place.
 * Asuna and Kirito party together. With Kirito and Asuna's help, the Dark Elf Kizmel defeats the Forest Elf.

{{Spoilers|

December 15th

 * Dawn - Asuna melts her Wind Fleuret +5 into an Argentium Ingot, then uses it to make her new rapier, the Chivalric Rapier.
 * Kirito Level 15, Asuna Level 14
 * 17:00 - The first clearing meeting for the 3rd Floor takes place.

December 18th

 * Kirito is Level 16, Asuna - Level 15, Kizmel - Level 16

December 20th

 * 17:00 - The last clearing meeting for the 3rd Floor takes place.

December 21st
}}
 * 13:12 - The 3rd Floor Boss, Nerius The Evil Treant, is cleared.

2023

 * Argus disbanded, RECTO Progress Inc. takes over SAO server management.
 * Konno Yuuki begins using the Medicuboid.
 * 22nd Floor Boss was cleared within 3 days of the 21st Floor being cleared.
 * On the day the 22nd Floor Boss was cleared, Kirito's Level was less than 40.

February

 * The battle versus the 25th Floor Labyrinth's Boss.
 * Over half of the Aincrad Liberation Squad members are annihilated. The ALS leaves the front lines and merges with MMO Today on the 1st Floor
 * The "Knights of the Blood" are formed and debut in the 26th Floor's boss clearing meeting.
 * Asuna joins the Knights of the Blood.

April 8th

 * Volume 2 - "The Red-Nosed Reindeer" begins.
 * Kirito joins the guild "Moonlit Black Cats".
 * Kirito is Level 40.

May

 * Creation of AmuSphere

May 9th

 * Lead Group makes it through the 28th Floor.

June 22nd

 * Front line at the 30th Floor
 * ~5:45PM: Death of the "Moonlit Black Cats" members, aside from Kirito.

October-November

 * Kirito acquires the unique skill «Dual Blades».

November

 * ALfheim Online (ALO) created.
 * Kirito learns rumors of a rare item drop which can revive dead players from Argo. Kirito starts power leveling even more so than before in order to solo the event.

December 20th

 * Kirito reached Level 69.

December 24th

 * Kirito reached Level 70.
 * The front line is at the 49th Floor.

December 25th

 * ~00:00 - 03:00 Aincrad Standard Time: Kirito defeats the event boss, Nicholas The Renegade and receives the rumored revival item, the Divine Stone of Returning Soul, only to be disappointed by its description.
 * 07:00 Aincrad Standard Time: Kirito receives a Timer-Activated Message Record Crystal from Sachi.
 * End of "Red-nosed Reindeer"

January

 * Kirito acquires the sword Elucidator from a rare drop.
 * Suguha joins ALfheim Online.

January 1st

 * Birth of the red guild "Laughing Coffin" (January 2024, SAO).

February 14th

 * The Silver Flags guild is attacked by the members of the Titan's Hand. 4 members of the guild are killed by the orange guild and only the leader managed to survive.

February 23rd

 * Front Line is at 55th Floor.
 * Beginning of "The Black Swordsman".
 * Silica gets lost in the Forest of Wandering after splitting from her party. Her partner Pina dies in battle, but she is saved by Kirito who found her by chance.

February 24th

 * Silica and Kirito come to the 47th Floor and acquire the Pneuma Flower.
 * The Titan's Hand guild's members are arrested and sent to the prison in the Black Iron Palace.
 * Pina is revived.
 * Kirito is level 78.
 * End of "The Black Swordsman".

March

 * Lisbeth's Smith Shop opened.

March 6th

 * Beginning of ME1 - "The Progressers".
 * 56th Field Boss Strategy Meeting
 * Duel between Asuna and Kirito.

March 7th

 * The Geocrawler is defeated.
 * End of ME1 - "The Progressers

April 22nd

 * Front Line is at the 59th Floor.
 * Volume 8 - "A Murder Case in the Area" begins.
 * Asuna falls asleep in Danac and Kirito ends up guarding her for most of the day.
 * 18:27: Caynz fakes his death.
 * Kirito just above Level 80.

April 23rd

 * ~5 PM : Yolko fakes her death.

June 24th

 * Front Line is at 63rd Floor.
 * Beginning of "Warmth of the Heart".

June 25th

 * Kirito arrives at Lisbeth's shop and requests a custom sword to be made.
 * Kirito and Lisbeth fall down into the X'rphan the White Wyrm's lair.
 * "Warmth of the Body" takes place(non-canon).

June 26th

 * Kirito and Lisbeth acquire the Crystallite Ingot that they were looking for and escape the dragon's lair.
 * Kirito acquired the sword "Dark Repulser".
 * End of Warmth of the Heart

August

 * "Sound of Water, Sound of Hammer" takes place.
 * Front Line is at 70th Floor.
 * Coalition against "Laughing Coffin".

September

 * ME4 - "Cold Hand, Warm Heart".

October

 * Volume 3 - Beginning of Prologue.
 * Volume 1, 2 - Prologue.
 * Volume 1 - Chapter 1.
 * Volume 1 - End of Chapter 4.
 * Volume 1 - Chapters 5-12.

October 1st

 * The Story Pencil Board story takes place.
 * Asuna and Lisbeth take a bath together in an open-air bath located outside the AREA, with Kirito guarding the two from monsters.

October 4th

 * The boss of the 73rd Floor was defeated a couple days prior to the events of The Fourteenth Autumn.
 * Beginning of "The Fourteenth Autumn"
 * Silica and Kirito celebrate Silica's birthday on the 35th Floor. Kirito gives Silica the Ring of Angel's Whisper as a gift, but she never gets the chance to actually use it.
 * End of "The Fourteenth Autumn"

October 9th

 * Front liners actively begin exploring the 74th Floor.

October 17th

 * Kirito obtained Ragout Rabbit
 * Kirito visits Asuna's home on the 61st Floor for the first time and Asuna cooked the Ragout Rabbit's Meat he had acquired.

October 18th

 * ~9:10 Aincrad Standard Time: Kuradeel challenges Kirito to a duel.
 * 15:00 Kirito and Asuna take a break to eat lunch in the Labyrinth.
 * Kirito uses his Dual Blades in public for the first time.
 * The Gleam Eyes is defeated; 75th Floor of Aincrad is reached.
 * Volume 1- Chapter 12.

October 19th

 * Kirito meets Heathcliff and they agree to duel.

October 20th

 * Kirito duels with Heathcliff and loses. Kirito joins the "Knights of the Blood ".
 * Volume 1 - Chapter 13.

October 22nd

 * Kirito wears Knights of the Blood's white uniform for the first time.
 * Kirito tells Asuna about his past guild, "Moonlit Black Cats", and his reason why he refuses to form a party or joining a guild with anyone since then.
 * Argo ended up being trapped in a flying log house after accepting the «Witch of the West and the Three Treasures» quest without bringing Toto with her.

October 23rd

 * Volume 1 - Chapters 14-16.
 * Kirito meets with Godfree and Kuradeel to train in the 55th Floor Labyrinth.
 * Kuradeel kills Godfree during training, and reveals that he is actually a member of "Laughing Coffin". Asuna arrives to save Kirito, but as she is about to deal the finishing blow, she had a moment of hesitation which Kuradeel used to disarm her. Kirito then rushes in and kills Kuradeel.
 * 21:00 Kirito proposes marriage to Asuna in her house in Selmburg.
 * Chapter 16.5 takes place. (non-canon)

October 24th

 * Kirito and Asuna request leave from the "Knights of the Blood".
 * "The Day Before" takes place: Kirito, Asuna and Argo took the "Wizard of Oz" side quest. After that, they get married on this day.
 * Sword Art Online Material Edition 10 (16.6) takes place.
 * 17:19 Kirito and Asuna get married.

October 25th

 * Sword Art Online Material Edition 11 (16.7) takes place.
 * Sword Art Online Material Edition 12 (16.8) takes place.
 * Kirito and Asuna move into their new home on the 22nd Floor.

October 26th - 29th

 * ME6 - "Algade Showdown".

October 30th

 * Beginning of "Morning Dew Girl".
 * Kirito and Asuna encounter Yui in a forest on the 22nd Floor.

October 31st

 * Kirito and Asuna travel to the Starting City with Yui; they encounter Sasha and the orphanage.

November

 * Volume 1 - Chapters 17-19.

November 1st

 * Kirito and Asuna are approached by Yulier. They enter the dungeon under Black Iron Palace.
 * Yui used the «Object Eraser» GM feature to delete the The Fatal Scythe.
 * Yui is erased by Cardinal, but Kirito manages to extract her core file and saved it to his NerveGear's local memory.

November 2nd

 * Kirito and Asuna leave the Starting City and return to the 22nd Floor.

November 3rd

 * Kirito meets Nishida.

November 3rd-November 5th

 * "Extraordinary Ordinary Days" begins. (non-canon) 

November 6th

 * Kirito and Nishida successfully manage to fish the local fish god.
 * Scout party of 20 people departs for the 75th Floor boss room. Half of the party is wiped out.

November 7th

 * Volume 1 - Chapters 20-24.
 * 10:00 Aincrad Standard Time: Kirito and Asuna report at Granzam
 * 13:00 Aincrad Standard time: Raid party departs for the 75th Floor boss room using a Corridor Crystal.
 * ~14:20 Aincrad Standard Time: The Skull Reaper is defeated. About fourteen players became casualties of this boss battle.
 * Kirito reveals Heathcliff's identity, which no less than Kayaba Akihiko himself.
 * Heathcliff duels Kirito as the final boss of SAO.
 * The "'if' story arc" of Infinity Moment and Hollow Fragment Started.
 * Asuna dies in the game.
 * Beginning of "The Final Promise".
 * 14:55 Aincrad Standard Time: Kirito defeats Heathcliff; Sword Art Online is Cleared.
 * ~15:00 Aincrad Standard Time: Around 6,000 remaining players are automatically disconnected, 300 of them (including Asuna) got transported to ALfheim Online instead of returning to the real world.
 * Keiko wakes up in her hospital room.
 * Ending of "The Final Promise".
 * Kirito wakes up in his hospital room.
 * SAO Deleted.
 * Kayaba Akihiko commits suicide by scanning his brain with a modified FullDive machine (a Soul Translator (STL) prototype) and is successful in transferring his scanned conscience onto the Internet.
 * Volume 1 - Chapter 25.
 *  End of Aincrad Arc. 
 * Volume 3 - End of Prologue.

2025

 * Creation of "The World Seed"

January

 * ME5 - "Salvia".
 * Volume 4 - Chapters 6, 7.
 * Volume 4 - Chapter 8..
 * ALO suspended.

January 19th

 * Beginning of Volume 3 - Chapter 1.
 * Kazuto visits Asuna at the hospital and meets Sugou Nobuyuki. During their conversation, he finds out about Nobuyuki's plan to get married to Asuna.

January 20th

 * Kazuto finds out about ALheim Online from Andrew and finds out about the picture of Asuna taken at the World Tree.
 * End of Volume 3 - Chapter 1.
 * Beginning of Volume 3 - Chapter 2.
 * Noon - Kirito enters ALO, meets Leafa and helps her defeat several Salamanders. At Swilvane, they decide to meet up the next day for a journey to the World Tree.
 * End of Volume 3 - Chapter 2.

January 21st

 * Volume 3 - Chapter 3-4.
 * Kirito and Leafa departed from Swilvane, and were attacked near the city of Legrue by 12 Salamanders.
 * Kirito stopped the Salamanders from attacking the Sylph and Cait Sith meeting.

January 22nd

 * ~02:00 JST: Kirito and Leafa accidentally entered Jötunheimr and encountered a beast-type Evil God, Tonkii.
 * ~03:00 - 04:00 JST: "Holy Sword Excaliber" found.
 * ~04:00 JST: Kirito and Leafa arrive at Alne
 * After 15:00 JST: Kirito received an admin card from Asuna and then challenged the Grand Quest on his own for the first time.
 * Kirito and Leafa recognize each other's real life identity.
 * "Battle" between Kirito and Leafa
 * Kirito reached top of the World Tree with the help of Leafa, Recon, Cait Sith and Sylph. At the top of the tree he met Asuna and fought against Oberon.
 * Kirito obtained The Seed from Kayaba Akihiko.
 * Sugou Nobuyuki attacked Kirigaya Kazuto in the car park outside Asuna's hospital,

February

 * The Seed package became available to the public for free

March

 * Kayaba Akihiko's hiding location is discovered.
 * Kazuto met Koujiro Rinko after asking her for a meeting to find out more about Akihiko.

April

 * SAO Survivor School's first school year begins.
 * ALO Re-established under new moderators. The data of all old ALO and SAO players is transferred to New ALO.
 * Gun Gale Online (GGO) Created.

April 10th

 * Beginning of the "Celeste Fairy".
 * Kirito receives a Bianchi bicycle from Suguha.

April 12th

 * Main events and ending of The Celeste Fairy

May 16th

 * Volume 4 - Chapter 9.
 * SAO Survivors Reunion being held in Agil's Cafe.

May 17th

 * 00:00 Establishment of New Aincrad inside of the New ALO.
 * The first 10 Floors of New Aincrad are opened up for conquering (the Floor Bosses still need to be defeated to gain access to the Floors though).
 *  End of Fairy Dance Arc. 

End of May

 * Sword Art Online - Girls Ops Volume 01 takes place.

June

 * Meeting between Shinkawa Kyouji and Asada Shino.
 * Shino joined GGO.

June 21st

 * Beginning of "The Day After".

June 22nd

 * ~4:00 PM: The boss battle of the 8th Floor of New Aincrad begins.
 * ~5:00 PM: The boss raiding party is wiped out.

June 23rd

 * The clearers attempt another raid on Wadjet the Flaming Serpent. Before the battle, Kirito changes his hairstyle from his previously spiky hair to his SAO day style.
 * End of The Day After

July 25th

 * Sword Art Online Extra Edition takes place.

August

 * 1st "Bullet of Bullets".

September

 * 11th to 20th Floors of New Aincrad are opened up for conquering.
 * Sinon acquired her "PGM Ultima Ratio Hecate II".

October

 * 2nd “Bullet of Bullets”.
 * EX3.2 Tragical story on VRMMO development takes place.

November 9th

 * Beginning of Volume 5 - Prologue.
 * 23:30:02 - 23:30:15 JST: "Death Gun" murders Shigemura Tamotsu (Zekushiido).
 * End of Volume 5 - Prologue.

November 14th

 * Shigemura Tamotsu's body is found.

November 25th

 * 22:10:04 JST: "Death Gun" murders Usujio Tarako.

November 28th

 * Usujio Tarako's body is found.

December

 * Volume 5 - Chapter 3.
 * Volume 5 - Chapters 4-5.

December 7th

 * Volume 5 - Chapters 1, 2.
 * Kazuto meets up with Kikuoka Seijirou, who asks him to investigate a case in Gun Gale Online.

December 13th

 * Volume 5 - Chapters 6-7.
 * 3rd “Bullet of Bullets” preliminaries.

December 14th

 * Volume 6 - Chapter 7.2.
 * Volume 6 - Chapters 8-9.
 * 20:00 JST: Beginning of the 3rd Bullet of Bullets
 * Volume 6 - Chapter 10.
 * 20:40-20:44 JST: "Death Gun" murders Pale Rider.
 * Volume 6 - Chapter 11.
 * Volume 6 - Chapter 12.
 * Volume 6 - Chapter 13.
 * Volume 6 - Chapter 14.
 * 22:04:37 JST: End of the 3rd Bullet of Bullets.

December 14th-16th

 * The Shinkawa Brothers are arrested.
 * Kanemoto Atsushi escapes.

December 16th

 * Volume 6 - Chapter 16.
 *  End of Phantom Bullet Arc. 
 * Sinon joined ALO.

December 24th

 * 21st Floor of New Aincrad unlocked.
 * The boss of the 21st Floor of New Aincrad is defeated by the 7 member party of Asuna, Kirito, Klein, Agil, Lisbeth, Silica and Leafa and other parties.
 * 22nd Floor of New Aincrad unlocked.
 * Kirito and Asuna leave their previously rented home in Yggdrasil City and reacquire their old wooden house that they had bought on the original Aincrad on the 22nd Floor.

December 28th

 * Volume 8 - "Caliber".
 * Klein saved Freyja (Thor).
 * Alternative (non-canon) ending: Caliber SS
 * Kirito acquired the "Holy Sword Excaliber".
 * Klein acquired the "Thunder Hammer Mjölnir" and gave it to Lisbeth.

December 31st

 * Silica Side Story: "A Spot of Sunshine in the Winter".

January

 * 23rd, 24th, 25th, 26th and 27th Floors of New Aincrad are unlocked prior to the events of Mother's Rosario.

January 6th

 * Beginning of "Mother's Rosario".

January 7th

 * Asuna duels with «Absolute Sword» Yuuki.
 * Asuna meets the members of the «Sleeping Knights»

January 8th

 * The boss of the 27th Floor of new Aincrad is defeated.

January 11th

 * Asuna meets Yuuki at the Yokohama North General Hospital

January 12th

 * Yuuki spends the first day at the SAO survivor school with Asuna.
 * Yuuki and Asuna visit Yuuki's old house.
 * Asuna shows her mother the forest around her house in New Aincrad and, the next day, she gets permission to continue her studies in the SAO survivor school, under the condition that she keeps her grades up.

January 16th

 * Asuna holds a barbecue at her house in the forest, with 30 players participating. The 30 players, having built up enthusiasm over the party, rush up to the 28th Floor's boss room and defeat the boss.

February

 * Asuna and the Sleeping Knights defeat the 29th Floor Boss of New Aincrad.
 * United dueling tournament in ALfheim Online. Yuuki wins first place, while Kirito comes second.

March

 * Asuna, Rika, Keiko and Suguha go on a 3 day and 2 night trip to the Yuuki family home in Kyoto, with Yuuki and her guild members using the Bidirectional Communication Probe to enjoy the sights as well.

Last Sunday of March

 * Yuuki passes away.

April

 * Accel World Volume 10 - "Versus"

First Saturday of April

 * Yuuki's funeral.
 * End of "Mother's Rosario".

May

 * Publication of "All Records of SAO Incident".

May 18th

 * ME3 - "Ceramic Heart".

June

 * Sinon obtained second place in 4th BoB.
 * Beginning of Alicization Arc.

June 26th-28th

 * Volume 9 - Alicization Beginning.
 * Kirito's dive into Underworld for 3 days as part of his part-time job.
 * 361-372 HWC

June 29th

 * Kazuto is attacked by "Johnny Black".

June 30th

 * ~13:45 JST: Kazuto transported away from Setagaya General Hospital.

July

 * Volume 10 - Alicization Running.

July 1st

 * Asuna contacts Rinko about Kazuto having disappeared, and Kikuoka's possible involvement.

July 5th

 * Rinko and Asuna arrives on the «Ocean Turtle»
 * Volume 11 - Alicization Turning.

July 6th

 * Volume 12 - Alicization Rising.
 * Volume 13 - Alicization Dividing.
 * 07:15 - The Destroyer DD-127 Nagato drives away from the Ocean Turtle.
 * Volume 14 - Alicization Uniting.


 * "Cradle of the Moon" takes place.
 *  End of Alicization Arc. 

August

 * "There is But One Ultimate Way" takes place. (non-canon)

End of Year

 * 5th "Bullet of Bullets".

Underworld Timeline
Due to the Fluctlight acceleration function of the Soul Translator, the time in Underworld passes at a much different rate than in real life (the FLA rate can be set anywhere from 1,000 to 5,000 times the rate of the real world). Therefore, a different calender, called the Human World Calendar (HWC), is used for events in Underworld. This calender only starts counting the time about 30 years after Quinella created the Axiom Church though, so some events do take place before the HWC.

70 Before HWC

 * Underworld is created.
 * 4 Rath employees log in and start raising 2 families of 8 Artificial Fluctlights each.

52 Before HWC

 * The Artificial Fluctlights reach the age of 18 and start families of their own.
 * The 4 Rath employees log out one at a time under the guise of an "epidemic".

17 HWC

 * Quinella is born.

30 HWC

 * The Axiom Church is established.

30-97 HWC

 * Rulid Village is founded.

97 HWC

 * Quinella discovers the existence of a system command list in Underworld.
 * Quinella increases her System Control Authority to the maximum and becomes the Administrator of the Human World.
 * Quinella stops the natural degeneration of her maximum Life and greatly increases the value of her maximum Life.
 * Quinella accidentally fuses the Cardinal System with her Fluctlight.

97-117 HWC

 * Quinella experiments with a command that directly manipulates the Fluctlight of a person on captured Underworld residents.

117 HWC

 * Quinella uses the Fluctlight altering command on herself and gets rid of her emotions.

167 HWC

 * Quinella discovers the Fluctlight memory limit and that she is about to reach it.
 * Quinella invites a nun to the top of the Central Cathedral and attempts to take control of her Fluctlight, to create a backup of her memories.
 * Cardinal gains control of the nun's body and retreats to the Great Library Room.

167-361 HWC

 * Quinella turns her research subjects into unconditionally loyal Integrity Knights.
 * Cardinal sends out observers to look for collaborators to aid her in fighting against Quinella.

361 HWC

 * Kirito first logs in into Underworld.
 * Eugeo is born.
 * Alice Schuberg is born.

7th Month of the HWC, 372

 * Beginning of Prologue I
 * Kirito, Eugeo and Alice venture to the cave at the Mountain Range at the Edge.
 * Alice touches the soil of the Dark Territory.
 * The next day, Deusolbert Synthesis Seven comes to Ruild Village and takes Alice away to the Central Cathedral.
 * End of Prologue I
 * In the following 2 days, Alice arrives at the Cathedral and goes through a «Synthesis Ritual», having her previous memories erased and becoming an Integrity Knight.

3rd Month of the HWC, 378

 * Beginning of Chapter 1
 * Kirito wakes up in Underworld after being injected with Succinylcholine by Kanemoto Atsushi (Johnny Black).
 * Kirito meets Eugeo for the first time after awakening in Underworld.
 * Selka ventures into the cave at the Mountain Range at the Edge and is captured by goblins.
 * Kirito and Eugeo catch up to Selka and fight the goblins. Eugeo is severely wounded but is healed with a «Life» transfer command.
 * Alice somehow makes an appearance as a spirit and tells Kirito that she is waiting for him and Eugeo at the Central Cathedral.
 * The Gigas Cedar is chopped down. Eugeo chooses his next Sacred Task to be a Swordsman.
 * Kirito chops off a single branch of the Gigas Cedar.
 * Kirito and Eugeo leave for Zakkaria.
 * End of Chapter 1

3rd to 8th Month of the HWC, 378

 * Kirito and Eugeo reach Zakkaria and start working for a family of farmers.

28th Day of the 8th Month

 * Beginning of Chapter 3
 * The Zakkaria Sword Arts Tournament takes place.
 * Kirito and Eugeo win the Tournament and become guards of Zakkaria.
 * End of Chapter 3

3rd Month of the HWC, 379

 * Kirito and Eugeo reach Centoria.

7th Day of the 3rd Month

 * Kirito and Eugeo visit Sadore's shop and give him the branch of the Gigas Cedar.

4th Month of the HWC, 379

 * Kirito and Eugeo successfully pass the Entrance Exams to the North Centoria Imperial Sword Mastery Academy as the 7th and 8th top ranked among all the new students, which means that they are given the privilege of becoming valets.

6th Day of the 3rd Month

 * Beginning of Chapter 4
 * Kirito promises to show his Aincrad-style skills to his mentor, Sortiliena, as a graduation gift to her.

7th Day of the 3rd Month

 * Kirito and Eugeo visit Sadore and claim the sword that he crafted over a year's time.
 * Kirito stains Uolo's uniform while practicing his Sword Skills and is then ordered to spar with Uolo as punishment for this insult.
 * Kirito spars with Uolo. Although Kirito manages hold out against Uolo and is even on the verge of winning, the match was halted by Azurika and claimed as a draw.
 * A celebration of the match is held in Sortiliena's room.

8th Day of the 3rd Month

 * Sortiliena defeats Uolo during the final graduations selection battle and graduates as the top ranked student of the North Centoria Imperial Sword Mastery Academy that year.

Last third of the 3rd Month

 * Sortiliena Serlut and Uolo Levanteinn are defeated in the Empire Swordsmanship tournament by Eldrie Woolsburg. Eldrie becomes a representative of the Norlangarth North Empire in the Four Empires Unity Tournament.
 * End of Chapter 4
 * Kirito and Eugeo are placed in 5th and 6th place during the promotion examination at the end of the year and become elite swordsmen-in-training.

4th Month of the HWC, 380

 * New school year at the Sword Mastery Academy begins.
 * Kirito and Eugeo are assigned valets of their own, Ronye and Tieze.

17th Day of the 5th Month

 * Interlude III
 * End of Interlude III
 * Beginning of Chapter 5
 * Eugeo spars with Humbert. The match is declared a draw.

20th Day of the 5th Month

 * Eugeo and Kirito go on a picnic with their valets, Tieze and Ronye.
 * Eugeo and Kitito confront Humbert for mistreating his valet, Frenica..

22nd Day of the 5th Month

 * Tieze and Ronye confront Humbert and Raios and "insult" them.
 * Humbert and Raios attempt to "punish" the girls.
 * Eugeo breaks the «Seal of his right eye» and attacks Humbert, cutting off his arm.
 * Kirito attacks Raios to protect Eugeo. Both Raios' hands are cut off with «Whirl Current».
 * Raios dies due to his Fluctlight breaking down.

23rd Day of the 5th Month

 * ~09:00 Eugeo and Kirito are arrested by Alice Synthesis Thirty.
 * End of Chapter 5
 * ~12:00 : Kirito and Eugeo are thrown into the Central Cathedral prison.

24th Day of the 5th Month

 * Beginning of Chapter 6
 * ~03:00 : Kirito and Eugeo escape from the Central Cathedral prison.
 * The two encounter Integrity Knight Eldrie Synthesis Thirty-one and battle with him. The battle is interrupted after the two boys start reminding Eldrie of his past life and Deusolbert Synthesis Seven interferes.
 * ~06:00 : Cardinal rescues the boys by leading them to the Great Library Room.
 * End of Chapter 6
 * Beginning of Chapter 7
 * ~09:00 : Kirito and Eugeo leave the Great Library Room and arrive on the 3rd floor of the Central Cathedral.
 * End of Chapter 7
 * Beginning of Chapter 8
 * Kirito and Eugeo defeat Deusolbert synthesis Seven.
 * ~11:00-12:00 : Kirito and Eugeo meet Fizel and Linel, who attempt to paralyze the intruders with poison.
 * Kirito and Eugeo defeat Fanatio Synthesis Two, as well as her 4 accompanying Knights, in battle. Fanatio is mortally wounded and Kirito uses one of Cardinal's daggers to have Cardinal save the dying Knight.
 * Kirito and Eugeo encounter Alice Synthesis Thirty on the 80th floor of the Central Cathedral. During the battle, Kirito and Alice fall out of the Cathedral after accidentally breaking its wall during their battle.
 * End of Chapter 8
 * Beginning of Chapter 9 and 10
 * ~15:00 Kirito manages to stop his and Alice's descent by stabbing his sword into a gap in the wall. They soon start ascending the cathedral using pitons generated via Sacred Arts and ascend to where the eighty-fifth floor is located by nightfall.
 * Kirito and Alice encounter gargoyles guarding the walls of the cathedral and, after defeating them, take shelter on a gargoyle terrace.
 * End of Chapter 9
 * Eugeo fights with Bercouli Synthesis One. At the end of the battle, Eugeo released his sword's recollections, freezing Bercouli in place.
 * Chief Elder Chudelkin casts a Sacred Art that "deep freezes" Bercouli. Chudelkin then seizes Eugeo.
 * End of Chapter 10
 * Beginning of Chapter 11
 * 20:00-21:00 : Alice overcame her «Seal of the Right Eye».

25th Day of the 5th Month

 * Just after 00:00 - Eugeo is tempted by Quinella and removes his "Core Protection"
 * End of Chapter 11
 * Beginning of Chapter 12
 * Around 02:00 - Kirito fights with Integrity Knight Eugeo Synthesis Thirty-Two.

17th Day of the 2nd Month
{{Spoilers|*Kirito's public demonstration/trial of Mechanical Dragon.
 * Beginning of the "Cradle of the Moon".
 * Kirito damaged Central Cathedral for the second time.

18th Day of the 2nd Month
}}
 * ~11:30 - A Human World resident killed, cause unknown.