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I chose 2004 as the base year since that's when the manga first began serialization in Jump. And it's easier to organize events when I have some kind of year pinned down. This is my own personal reference, feel free to move the year around for yourself or even ignore it altogether.

Notes:

  • Daily Life arc~Varia arc is largely referenced from Vongola 77. The ages are therefore inferred to be the age the character was at the time of their introduction. This supposition based off of Lambo and I-pin being introduced as 5-years-olds, and the databook agreeing as much. Which are some of the few definitive ages mentioned canonically within the manga.
    • The EXCEPTION is Tsuna and his agemates + Ryohei. Because if we went off of that rule for Tsuna (he's put down as 14 in the databook), he'd have had two birthdays since his introduction and he'd be a bewildering 16 years old by the end of Varia arc and definitely should've been in high school by then. Let alone Ryohei (who should be 17 by the Varia arc if we went by that logic). So, I've notched down their ages so Tsuna is 14 during Varia arc, (This... is probably what confused Amano.) Those ages are marked with a '*'.
  • The reason I mention some birthdays and not others is to easily display the ages the characters were at the time of their introduction.
  • Everything after October 28, 2005 is purely based off of my own deductive reasoning supported by various parts of the manga. Everything is sourced as much as possible.
  • Vongola 77 scans
  • Recommended best view is Desktop Mode, particularly with the Future Arc sections. Different timelines/parallel worlds are colored differently from the world "our" Tsuna originates from.
Key
Missing information
~ About/approximate

This is a constant work in progress.

Timeline

Date Events

Before start of chapter 1

Jan 1 Birth of Giotto, Vongola Primo.
1935 Apr 17 Birth of Timoteo.
1965 Birth of Ottavio.[1]
1962 Mar 23 Birth of Mangusta.
Apr 1 Birth of Tsuyoshi Yamamoto.
1966 Jun 21 Birth of Romario.
1967 Jun 15 Birth of Iemitsu Sawada.
1969 Feb 9 Birth of Doctor Shamal.
1970 Mar 31 Birth of Nana Sawada.
1971 Sep 30 Birth of Moretti.
1976 Nov 2 Birth of Turmeric.
1079 Dec 15 Birth of Lancia.
1980 Apr 4 Birth of Lussuria.
Dec 13 Birth of the Bloody Twins.
1981 Oct 10 Birth of Xanxus.
Nov 14 Birth of Levi A Than.
1982 Feb 4 Birth of Dino.
1983 Mar 5 Birth of Oregano.
Mar 13 Birth of Superbia Squalo
Apr 13 Birth of Giannini
May 28 Birth of Romeo?
1986 Nov 8 Birth of Bianchi.
1989 Dec 22 Birth of Belphegor and Rasiel.
1990 Mar 13 Birth of Kensuke Mochida.
Jun 9 Birth of Mukuro Rokudo
Jun 22 Birth of Pantera.
Jul 3 Birth of M.M.
Aug 26 Birth of Ryohei Sasagawa.
Oct 26 Birth of Chikusa Kakimoto
Nov 9 Birth of Tetsuya Kusakabe.
1991 Mar 4 Birth of Kyoko Sasagawa.
Apr 20 Birth of Hana Kurokawa.
Apr 24 Birth of Takeshi Yamamoto
May 3 Birth of Haru Miura.
Jul 23 Birth of Basil.
Jul 28 Birth of Ken Joshima.
Aug 9 Birth of Longchamp Naito.
Sep 9 Birth of Hayato Gokudera.
Oct 14 Birth of Tsunayoshi Sawada.
Dec 3 Birth of Shoichi Irie.
Dec 5 Birth of Chrome Dokuro.
1992 Jan 27 Birth of Lunga
1994 Jun 2 Creation of Manny and Lenny.
Sep 14 Lavina dies in a car crash while on her way to see Hayato.[2]
1995 Aug 29
  • Dino's father is killed by Irregolare Famiglia and Dino inherits as Cavallone 10th.[3] (Dino age 13)
  • Birth of Enzio.[4]
1996 Jan 11 Birth of Futa.
1997 Aug 23 Birth of Mitsuru Fujimori.
1997~1998
  • At age 6, Hayato is set to perform on the piano and get poisoned by Bianchi for the first time.[6]
  • Birth of Guido Greco.[7]
1998 Nov 25 Birth of I-Pin.
1999 May 28 Birth of Lambo.
  • Makoto Kozato is framed for the attack on several Family bosses.
  • The Flood of Blood and the deaths of Makoto, his wife, and daughter's murders go unsolved.[8]
1999~2000
  • Hayato runs away from home at age 8.[6]
~2000
2003 Nov 8 Bianchi's birthday. Age 17.[10]
Nov 25 I-Pin's birthday. Age 5.[11]
Dec 3 Shoichi Irie's birthday.[12] Age 12.*
2004 Feb 4 Dino's birthday. Age 22.[13]
Feb 9 Doctor Shamal's birthday. Age 35.[14]
Feb 19 Moretti's birthday. Age 33.[15]
Mar 4 Kyoko Sasagawa's birthday. Age 13.[16]
Mar 13 Kensuke Mochida's birthday. Age 14.[17]
Mar 31 Nana Sawada's birthday. Age 34.[17]
Apr 1 Tsuyoshi Yamamoto's birthday. Age 42.[18]
Apr 20 Hana Kurokawa's birthday.[19] Age 13.*
Apr 24 Takeshi Yamamoto's birthday.[20] Age 13.*
May 3 Haru Miura's birthday.[21] Age 13.*
May 5 Kyoya Hibari's birthday.[22]
May 28

Daily Life Arc

Jun 17

Reborn leaves Italy on a Vongola charter plane.[26]

Jun 18

Chapter 1: Enter home tutor Reborn, to turn Tsunayoshi Sawada into Vongola Decimo.[17]

Jun 19
  • Chapter 1: Tsuna vs. Kensuke Mochida.[17]
  • Nana buys Reborn's coffee maker from an electronic's shop.[17]
Jun 21
  • Romario's birthday. Age 38.[27]
  • Hayato submits his transfer papers to the principal at Namimori Middle School, not precisely legally.[28]
Jun 22

Pantera's birthday. Age 14.[29]

Jun 25

Chapter 3: Hayato Gokudera joins Tsuna's class. Tsuna vs. Hayato.[30]

Jun 26

Chapter 4: Dohachiro Nezu tries to expel Tsuna and Hayato.[30]

Jun 27

Six high schoolers suddenly give Tsuna an offering. Hayato's fault.[30]

Jun 28

Chapter 5: Takeshi asks Tsuna for advice on his batting.[31]

Jun 29

Chapter 5: Takeshi attempts suicide, is saved by Tsuna, and joins Tsuna's famiglia.[31]

Jun 30~Jul 1

Chapter 6: Kyoko is hit with the Dying Will Bullet while playing russian roulette.

Jul 2
Jul 4

Haru spots an angelic baby (Reborn) outside her window.[33]

Jul 6

Chapter 8: Family entrance test.[34]

Jul 7

Colonnello's birthday.[35]

Jul 9

Chapter 9: Bianchi appears.[34]

Jul 10

Chapter 9: Bianchi switches out Kyoko's Home Ec riceballs.[34]

Jul 11
Jul 12

Chapter 11: Haru introduces herself to Reborn... and Tsuna.[36]

Jul 13

Chapter 11: Haru challenges Tsuna for Reborn's honor, nearly drowns, then gets saved by Tsuna.[36]

Jul 20

Tsuna forgets his summer homework at school, gets beat up by Reborn.[36]

Aug 8
Aug 9

Longchamp Naito's birthday.[38] Age 13.*

Aug 26

Ryohei Sasagawa's birthday.[39] Age 14.*

Aug 29

Enzio's birthday. Age 9.[4]

Sep 3

Chapter 14: Ryohei invites Tsuna into the Boxing Club for the first time.[40]

Sep 5

Chapter 15: Tsuna contracts Skullitis and meets Doctor Shamal.[40]

Sep 6

Lambo poops himself.[40]

Sep 7

Chapter 16: Reborn tricks Hayato and Takeshi into taking an unconscious Tsuna to the Disciplinary Committee's reception room and make it a Vongola base. Tsuna "fights" Hibari for the first time.[41]

Sep 9

Hayato Gokudera's birthday.[42] Age 13.*

Sep 20

Chapter 17: For the Athletic Festival, Tsuna is volunteered to be the leader of the Pole Knocking event.[41]

Sep 21
  • Chapter 18: Namimori Middle School Athletics Festival.[41]
  • Ryohei extremely defeats an EMT.[41]
Sep 25

Shoichi hits himself with ammo from the 10-Year-Bazooka and time travels for the first time.[43]

Sep 30

Chapter 19: Tsuna thinks he's killed Moretti.[15]

Oct 1

Haru and the Miura clan repair Haru's yakatabune costume while crying.[15]

Oct 8

Chapter 20: Reborn, Lambo, and Bianchi pull a dine-and-dash on Tsuna at TakeSushi.[18]

Oct 10

Birds' birthday. Age 37.[44]

Oct 13

Chapter 22: Reborn's birthday.[45]

Oct 14

Tsunayoshi Sawada's birthday. Age 13.* A modest celebration at the hospital. Lambo steps on the cake.[18]

Oct 17

Chapter 23: I-Pin saves Tsuna from an angry dog and finds Kyoko's wallet.[4]

Oct 18

Chapter 23: I-Pin mitakes Tsuna for her target.[4]

Oct 19—Nov 18

Chapter 24 - chapter 25: I-Pin stays in Japan; Joins the Sawada household.[4]

Oct 26

Kakimoto Chikusa's birthday. Age 14.[46]

Nov 2

Turmeric's birthday. Age 28.[47]

Nov 8

Bianchi's birthday. Age 18.

Nov 9

Tetsuya Kusakabe's birthday. Age 14.[48]

Nov 14

Levi A Than's birthday. Age 23.[49]

Nov 24

Chapter 26: Nana gets pickpocketed by the Three Criminal Brothers.[4]

Nov 25
  • I-Pin's birthday. Age 6.
  • Chapter 26: The Sawada household totally wreck the Three Criminal Brothers.[4]
Dec 1

On an airplane to Japan, the oshibori Dino uses gets on Enzio and he enlarges.[4]

Dec 3
Dec 4
Dec 5

Chrome Dokuro's birthday. Age 13.[51]

Dec 13

The Bloody Twins' birthday. Age 24.[44]

Dec 15

Lancia's birthday. Age 25.[52]

Dec 17

Chapter 30: Tsuna, Dino, Hayato, and Takeshi get lost on Reborn's Death Mountain.[27]

Dec 18

Hayato goes to the library to check out "Sea Gods, Mountain Gods Encyclopedia."[27]

Dec 22

Belphegor's birthday. Age 16.[5]

2005 Jan 3

Chapter 31: Everyone comes over for Vongola style "Family versus" games against the Cavallone Famiglia.[53]

Jan 5

Julie Katou's birthday.[54]

Jan 9

Deisy's birthday.[54]

Jan 11

Futa's birthday. Age 9.[55]

Jan 15

Uni's birthday.[54]

Jan 25

Chapter 33: Parent Participation Day.[56]

Jan 27

Lunga's birthday. Age 13.[29]

Jan 30
Jan 31

Chapter 35: Haru and others come over and meet Futa.[56]

Feb 4

Dino's birthday. Age 23.

Feb 9

Doctor Shamal's birthday. Age 36.

Feb 14
  • Chapter 36: Kyoko, Haru, and Bianchi make choclate fondue for the boys.
  • Valentine's Day. Hibari gathers the many chocolates in his shoe locker and goes home.[56]
Feb 19
  • Moretti's birthday. Age 34.
  • Chapter 39: Reborn picks Takeshi up from the batting center and offers to train him. Anniversary of the opening of Namimori Middle School.[57]
Feb 20
Feb 22

Chapter 40: Tsuna is roped into guarding against dojo yaburi by Ryohei.[57]

Feb 23

Large Ooyama's birthday.[54]

Feb 24

Hana spots Adult Lambo at the Sawada residence.[57]

Feb 28
  • Spanner's birthday.[54]
  • Chapter 41: Hana coerces Tsuna into introducing her to Adult Lambo. Unfortunately, the 10-Year-Bazooka malfunctions and it only switches Lambo and Adult Lambo minds. And Adult Lambo gets stuck in the present for a week.[59]
Mar 3

Fon's birthday.[54]

Mar 4

Kyoko Sasagawa's birthday. Age 14.

Mar 5

Oregano's birthday. Age 22.[47]

Mar 7

Adult Lambo returns to 10-years-later and gets arrested.[60]

Mar 10
Mar 13
Mar 14

Byakuran's birthday.[54]

Mar 23

Mangusta's birthday. Age 43.[29]

Mar 31
  • Nana Sawada's birthday. Age 35.
  • Chapter 43: Tsuna and everyone go for hanami. Shamal infects Hibari with Sakura-kura Disease.[63]
Apr 1

Tsuyoshi Yamamoto's birthday. Age 43.

Apr 4

Lussuria's birthday. Age 25.

[64]

Apr 8

Chapter 44: Enter Longchamp Naito. First day of Tsuna's second year of middle school.[63]

Apr 9
Apr 13
Apr 14

Chapter 46: Tomaso headquarters is wrecked thanks to Reborn, Hayato, and Lambo.[67]

Apr 15

Lambo and Longchamp get snot all over Tsuna's pajamas.[67]

Apr 17

Timoteo's birthday. Age 70.[68]

Apr 19

Chapter 47: Tsuna and Hayato agree to go on a group date with Longchamp.[69]

Apr 20

Hana Kurokawa's birthday. Age 14.*

Apr 24

Takeshi Yamamoto's birthday. Age 14.*

Apr 25

Bluebell's birthday.

May 2

Verde's birthday.[54]

May 3

Haru Miura's birthday. Age 14.*

May 3—4

Chapter 48 - Chapter 49: Reborn takes Tsuna and family to Mafia Land and meet Colonello.[70]

May 4
May 5
  • Kyoya Hibari's birthday.
  • Bianchi is so happy Reborn accepted her proposal, she kills three people.[37]
May 10

Kaoru Mizuno's birthday.[54]

May 28

Lambo's birthday. Age 6.

Jun 2

Manny and Lenny's birthday. Age 11.[71]

Jun 6
Jun 9

Mukuro Rokudo's birthday. Age 15.[73]

Jun 14

Chapter 52 - chapter 53: Tsuna meets Giannini. Invisible assassins attack Tsuna, and Hayato is shrunk into a child.[72]

Jun 15

Iemitsu Sawada's birthday. Age 38.[74]

Jun 16

Enma Kozato's birthday.[54] Age 14.

Jun 17

Chibi-Hayato strangles Adult Lambo.[72]

Jun 22

Pantera's birthday. Age 15.

Jun 28

Chapter 54: Tsuna learns how to swim.[66]

Jun 29

Chapter 54: 15-meter breast-stroke swim test.[75]

Jul 2

Viper's birthday.

Jul 3

M.M.'s birthday. Age 15.[76]

Jul 6

Ryohei has written "extremely" over Kyoko's Tanabata wishes.[66]

Jul 7
  • Colonnello's birthday.
  • Chapter 55: Tanabata. Vongola-style Community Relationship Building Tanabata Contest.
Jul 9

Chapter 56: Lambo recieves a suspicious invitation and never returns that night.

Jul 10

Chapter 56: Tsuna suspects something happened to Lambo.[77]

Jul 21

Romario's birthday. Age 39.

Jul 23

Basil's birthday. Age 14.[78]

Jul 28
Aug 1

Lambo poops himself.[77]

Aug 4

Chapter 58: Tsuna and friends hang out at the summer festival and watch the fireworks together.[80]

Aug 7

Zakuro's birthday.[54]

Aug 8

Skull's birthday.

Aug 9

Longchamp Naito's birthday. Age 14.*

Aug 15
  • Chapter 60: Romeo tries to drag Tsuna and Lambo to Hell during a test of courage.[80]
  • Haru returns home from a 100km hike on the mountain.[80]
Aug 23

Mitsuru Fujimori's birthday. Age 8.[81]

Aug 26
  • Ryohei Sasagawa's birthday. Age 15.*
  • Chapter 61: Hayato's devotion to Tsuna is tested with a fake promotion by the 9th.
  • Mukuro escapes prison. It was easy.[82]
Aug 29
~Sep

Shoichi Irie time travels a third time into a timeline of devastation caused by Byakuran. He unknowingly brings back a message from a 10YLByakuran to the current Byankuran.[84]

Sep~Oct

Shoichi Irie time-travels five more times seeing variations of the same horrors.

Sep 1
Sep 2

Futa is kidnapped by the Kokuyo gang.[71]

Kokuyo Arc

Sep 7—9

Chapter 62: Multiple Namimori Middle School students are hospitalized with missing teeth.[48]

Sep 9
Sep 16
  • Italian Ex-Military take over the official guest hall on Mafia Land, taking 150 people hostage for 20 million euros.
  • X-Fiamma: Xanxus shows himself to Ottavio.
Sep 17

X-Fiamma: The other Varia officers free the hostages. Xanxus reveals he knowns Ottavio had been dealing with underlings in the military, exchanging money for weapons which he then sold on the black market. But when the military found out, and those underlings went to Ottavio for help, Ottavio left them to rot. In revenge, those now ex-military, attacked Mafia Land and the party he organized in order to ruin Ottavio's reputation. Xanxus also reveals he knows Ottavio is the one who betrayed their plans to the 9th, about their planned coup d'etat eight years ago. Xanxus executes Ottavio and his men. Moretti, who was undercover as one of those underlings, barely escapes with his life.

Sep 20

Shitt P!'s birthday.[54]

Sep 26

Gamma's birthday.[54]

Oct 10

Xanxus' birthday. Age 24.[98]

Oct 11

Chapter 81: Mukuro goes to Takeshi's baseball game possessing Mitsuru Fujimori.[99]

Varia Arc

Oct 13
  • Reborn's birthday.
  • Iemitsu meets with the Mukuro-possessed-Chrome to make a deal about Guardianship.[100]
  • Nana, getting news of Iemitsu's return, excitedly shops enough food to feed 30 people.[101]
  • Chapter 82 - chapter 84: Hunting Basil, Squalo attacks. Tsuna receives the Vongola Half-Rings from Dino. Iemitsu returns home.[102]
Oct 14
  • Tsunayoshi Sawada's birthday. Age 14.*
  • Chapter 87: Everyone starts their own training. Reborn trains Tsuna via cliff climbing.
  • Chapter 96: At the Sawada residence, Adult Lambo finds the ring, a note, and horns left to him by Iemitsu.[103]
  • Volume 11 extra: Kusakabe and Romario relate and bond over being #2 to their respective leaders.[104]
Oct 16

Chrome receives a broken umbrella from some bilingual kid.[105]

Oct 18
  • Basil tries sushi and cries. (It's because of the wasabi. He's become a little more grown up.)[106]
  • chapter 93: Levi gets thwarted when he hunts down the Lightning Ring. Cervello introduces themselves as the Ring Scramble referees.
Oct 19
Oct 20
Oct 21
  • Moretti, "dead" at home, receives an emergency call from Iemitsu.[109]
  • At the airport, Iemitsu gets his pickaxe gets confiscated by Customs.[110]
  • Getting a call from his subordinates, Hibari heads to Nami-Middle and witnesses the Mountain God.[111]
  • Chapter 100 : While shopping at a convenience store, Bel kills local assassins in the neighborhood.[112]
  • CEDEF headquarters is attacked by the Varia.[113]
  • Chapter 101 - chapter 104: Battle of the Storm Guardians.
Oct 22
  • Futa's 'Cakes' page in his Ranking Book stinks of gyoza.[114]
  • Chapter 106: Iemitsu and Lal Mirch sneak into Vongola headquarters.[115]
  • Lussaria regains consciences in a pleasant daze.[116]
  • Chapter 107 - chapter 111 - Battle of the Rain Guardians.
  • Lacking  enough bandages, Romario gives up on giving Takeshi the "manly treatment."[117] Dino's subordinates rescue Squalo and is submitted into major surgery.[118]
  • Iemitsu's operation to invade Vongola headquarters and reach the 9th begins.[68]
Oct 23
Oct 24
  • Dino receives a message from Iemitsu that the 9th is an impostor.[121] 
  • In the early morning, Mammon gets caught by Gola Mosca.[122]
  • Lancia gets released from Vindicare. Heads to Japan.[123]
  • Chapter 119 - chapter 122: Battle of the Cloud Guardians. Dissatisfied, Hibari attempts to fight Xanxus. Gola Mosca "malfunctions" and reveals Vongola Nono was being used to battery the robot. 
Oct 25
  • At lunch, I-Pin gets farted on by the recently awoken Lambo.[124]
  • Hana hears about Tsuna's match. Shock.[125]
  • Lussaria regains consciousness on a truck heading to Nami-Middle.[126]
  • Nana goes to pick up discharged Lambo from the hospital.[127]
  • At night, Squalo regains consciousness and is escorted to Nami-Middle.[128]
  • Chapter 125 - chapter 135: Battle of the Skies. Tsuna vs. Xanxus.  Lancia helps rescue everyone when the Varia inevitably show their willingness to cheat.
  • Timoteo regains consciousness in the ICU; is out of danger of dying.[129]
Oct 26
  • Chikusa Kakimoto's birthday. Age 15.
  • Chapter 135: Party celebrating the 10th Gen's win at Takesushi.
  • Lambo poops himself at the party. Tsuna gives him a bath at home.[130]

Future Arc

Oct
  • Returning from his eighth trip of time traveling, with his memories erased, Shoichi Irie is blackmailed into shooting Reborn and the others with the 10-Year-Bazooka.[131]
Oct 27
  • Chapter 136: Lancia and Basil leave. Lancia gives Tsuna his dead boss's ring. Reborn disappears after being hit with the 10-Year-Bazooka.
  • Hayato gets his mail order of nama yatsuhashi. Hurries to Tsuna's house.[132]
Oct 28
  • Chapter 136: Tsuna goes looking for the missing Reborn. The underground shopping mall at Nammimori Station begins development. Tsuna gets hit with the 10-Year-Bazooka. Hayato too.
6/1/2019 MAJOR EDITORIAL NOTICE: In chapter 140 Reborn tells Tsuna they were transported "9 years and 10 months" into the future. However, this is the only time it's been mentioned, as far as I've found. (Feel free to correct me.) And considering all the other references to how time has progressed— e.g. Ryohei spending approximately a month looking for everyone across Japan. Whereas if they were displaced 9 years and 10 months, he shouldn't have even noticed anyone going missing for more than a day or two before everyone was returned.— it's my belief Amano either forgot about this detail or chose to ignore it. So, henceforth, I will also disregard it. Feel free to adjust accordingly.

(You can also make the claim that only Reborn was transported early. But, that's going into further headcanon territory. Which, I did my best to avoid here, and stuck as much to deductive reasoning as possible.)

2005 ~Oct 29—Nov 23

Takeshi, Kyoko, Haru, I-Pin, Lambo, Chrome, and Hibari disappear into the world 10-years-later one after another. Ryohei spends weeks looking across Japan for them, before he too is also eventually transported.[133]

2006 Jun 1—Oct 1

The third year of middle school, Shoichi Irie coincidentally meets Tsunayoshi Sawada and fixes his bike.[134] The event is one of the final triggers that allows for the fruition of the Vongola Boxes in this world.[131]

2010 Apr~Oct

Shoichi Irie starts attending university in America and meets Byakuran. They become friends and create Choice,[131][135]

Oct

Five years since the last time he time traveled, Shoichi Irie (henceforth referred to as→10YLShoichi)'s memories return.[131]

Chrome, Ken, and Chikusa attempt to break Mukuro out of prison but fail.[136]

???

Aria dies and Uni becomes the 10th boss of the Giglio Nero.[137]

Three months after Uni inherits, Genkishi returns wounded from a fight with Squalo, all according to the Gesso Famiglia's trap. Uni decides to speak to Byakuran personally.[137] The Millefiore Famiglia is formed.

2012 The Millefiore/Gesso Famiglia's base in Japan is completed under the guise of the Namimori Station Shopping Mall.[138]
10YLFuta was in charge of 10YLLambo up to this point.[139]
The old woman who worked at Kawahira Realtor passes away.[140]
2014

Guido Greco escapes prison.[7]

2014 Sep 25

The first parallel world Shoichi Irie time-traveled to. Bumps into Byakuran for the first time. 10YLShoichi and Byakuran of this timeline are students at a university of engineering in America.[43]

2014 Oct~Dec

The second parallel world Shoichi Irie time-traveled to. He bumps into Byakuran of this world, who recognizes him from the university timeline. 10YLShoichi of this timeline is a poor musician in financial debt to some kind of gang.[141]

2015 ~Sep

The third parallel world Shoichi Irie time traveled to. The world is in ruins.[84] One of Byakuran's subordinates plants a message on Shoichi to be received by the past version of Byakuran.[131]

2015 Sep~Oct Shoichi Irie time traveled to four other parallel worlds.
2015 Oct

The eighth and last parallel world Shoichi Irie time traveled to. His memories are buried, set to be released in five years by the 10YLShoichi of this timeline. In order to get close to Byakuran of Shoichi's world. He's sent back with a message to shoot Reborn, Tsuna, and everyone else with the 10-Year-Bazooka.[131]

2015 Apr~May
Oct 23

Nana and Iemitsu have gone missing after going off on vacation.[143] 

Oct 26
  • Vongola headquarters is destroyed.[144] 
  • The Tomaso Familglia and Mochida have gone missing.[145]
Oct 28

Chapter 136: Tsuna Ends up in the future 10YL,[146] followed shortly by Hayato. Both are found by Lal then 10YLTakeshi and taken to base.

Oct 29

Chapter 141 - chapter 148: Takeshi, I-Pin, Lambo, Kyoko, and Haru end up in the future during a fight with Nosaru and Tazaru. Lal agrees to help train them and teaches them how to use Box Weapons.

Oct 30

Chapter 148 - chapter 156: Kyoko runs off and the base receives a distress signal from Hibird. The group split up to go after both. Hayato and Takeshi have a heart to heart. 10YLHibari rescues them from Gamma. 10YLBianchi and 10YLFuta return to base from information gathering about the Millefiore. 10YLKusakabe explains the Foundation and 10YLHibari's research into Boxes.

Nov 1—Nov 11

Tsuna receives one-on-one training with Lal Mirch.[147]

Nov 8

10YLBianchi's birthday. Age 29.

Nov 9,

10YLTetsuya Kusakabe's birthday. Age 25.

Nov 12

Chapter 156 - chapter 161: Takeshi and Hayato recover enough to start training.[148] Reborn trains Takeshi, 10YLBianchi with Hayato, 10YLHibari with Tsuna. Tsuna undergoes the Vongola Trial. They learn more about where Boxes come from. Chrome ends up in the future.

Nov 13

Basil arrives in the future, in Spain with information on the current time.[149]

Nov 14

10YLLevi A Than's birthday. Age 34.

Nov 15

Chapter 162: Tsuna and Takeshi hear a little of Hayato's past.[150]

Nov 16

Chapter 162 - chapter 169: Tsuna and Takeshi try to cheer up Hayato with learning to make sushi. Chrome is attacked by Glo Xinia. 10YLMukuro saves her as Mukurowl, and 10YLRyohei picks her up and brings her back to base. 10YLRyohei tells them the Vongola Alliance plans to attack the Millefiore bases in five days, and that so long as Tsuna is there, the attack on the Japanese base will be up to him. Leonardo Lippi is exposed as 10YLRokudo Mukuro (10YLMukuro vs. Byakuran). Chrome's condition worsens in affect. Tsuna decides they will fight when he sees Lal's desperation.

Nov 17

Chapter 170 - chapter 173: How to balance the hard and soft Flames clicks for Tsuna. Hayato opens Uri, figures out Sistema C.A.I.. Takeshi watches the compilation documentary 10YLSqualo made for him. Reborn leaves Takeshi for now, promising a final test in three days time.

Nov 20

Chapter 173 - chapter 174: Reborn's final test for Takeshi.[151] The Millefiore attack in the middle of the night... right into 10YLHibari's trap.

Nov 21

Chapter 175 - chapter 229: Early morning, so early it's before dawn, they have to start the attack on the Merone Base[152] while 10YLHibari distracts the majority of the Millefiore forces. Lal Mirch vs. Ginger Bread. Tsuna vs. Spanner's Moscas. 10YLRyohei vs. Baishana. 10YLRyohei vs. Gamma. Hayato vs. Gamma. Spanner helps Tsuna complete his X-Burner. Takeshi vs. Genkishi. 10YLKusakabe, Chrome, Lambo, and I-Pin sneak into the Marone Base. 10YLHibari vs. Genkishi, Hibari appears in the future. Tsuna vs. Iris Hepburn & Ginger Bread. Hibari vs. Genkishi. Tsuna vs. Genkishi. 10YLIShoichi exposes that he's part of 10YLTsuna's plan. The Varia attack the Millfiore base in Italy. 10YLBel & Fran vs. Rasiel & Olgert. 10YLXanxus vs. Rasiel & Olgert.

Nov 22

Chapter 229: Early morning/dawn:[153] Byakuran reveals he knew of 10YLShoichi's true alignments. Ryohei is brought to the future. The 10th gen receives their Vongola Box Weapons. 10YLShoichi and Spanner are brought into the Vongola Famiglia. Most return to base.

Nov 23

Chapter 230 - chapter 235: Ryohei, who had been searching for everyone all over Japan for weeks,[133] is brought up to speed.[153] Basil arrives in Namimori. They take the girls out and around the town; Haru, Kyoko, and Ryohei visit their homes. They visit the middle school. 10YLShoichi explains Choice to Reborn. Tsuna and crew learn how to drive Motorcycles. Tsuna tries opening his box weapon to terrifying results. 10YLDino appears before them.

Nov 24

Chapter 235 - chapter 237: They start training how to fight with their Vongola Boxes, with the exception of Tsuna who is still trying to open his. Squalo heads to Japan. Haru and Kyoko demand to be told what's going on properly and go on strike.

Nov 25
  • I-Pin's birthday. Age 7.
  • Chapter 237: The boys utterly fail at housework. The girls decide to at least put aside the strike on housework.
Nov 26

Chapter 237 - chapter 238: Tsuna comes clean about the mafia to Kyoko and Haru. Byakuran contacts them, reminding them to meet in six days. 10YLSqualo arrives to take Takeshi away for training.

Dec 1

10YLShoichi and Spanner arrive at the base.[154]

Choice Arc - Future Final Battle Arc

Dec 2
  • Chapter 257 - chapter 265: 10YL Squalo vs. Zakuro who breaks into the Vongola base. Tsuna's group meet Kawahira. 10YLDino & Hibari vs. Deisy. Gamma, Nosaru, and Tazaru meet up with them in time to stop Uni from getting kidnapped. Team Vongola vs. Torikabuto. Iris goes to retrieve Ghost from Vindice Prison, however, it turns out Fran and the Kokuyo gang tricked the Vindice into releasing 10YLMukuro using the Millefiore's faces. The Vongola Team retreat to the forest where Uni foresaw would be the final battlefield between them and Byakuran.
Dec 3
  • 10YLShoichi Irie's birthday. Age 24.*
  • Chapter 265 - chapter 281: Vongola vs. Millefiore. Tsuna vs. Ghost. Tsuna vs. Byakuran. The Vongola Rings are unsealed. Uni sacrifices herself to revive the other Arcobaleno. With her "death," Uni gives the Arcobaleno her Flames to seal the power of the Mare Rings, which the Arcobaleno can use to undo the events done in the parallel worlds.
Dec 4?

Chapter 282: Everyone returns to the past. The Arcobaleno share the 10YL counterparts' memories with those of Tsuna's world. Their return causes an earthquake that helped surface the Simon Rings.

2005 Oct~Dec

Everyone returns from the future. And memories are shared amongst the current versions of Varia, Cavallone, Gesso, and Giglio Nero. Aria disappears.[156]

Dec 5

Chrome Dokuro's birthday. Age 14.

Dec 15

Lancia's birthday. Age 26.

Dec 22

Belphegor's birthday. Age 17.

Inheritance Ceremony Arc

The following loses time after the end of the Future Arc. So the start is based on my own guesswork.'
2006 ~Jan[157]
Day 1

Chapter 283 - chapter 284: Reborn receives a letter from the 9th about holding the inheritance ceremony. Simon Decimo and his Guardians transfer into Namimori Middle School.

Day 2

Chapter 285 - chapter 287: Hibari vs. Adelheid. Reborn reveals the transfer students are of the Simon Famiglia. A Pesca Famiglia assassin attacks Tsuna. Hayato tries to get the Simon to cooperate with them for Tsuna's protection.

Day 3

Chapter 288: The Simon come over to Tsuna's house as protection. Koyo Aoba vs. Ryohei "studying" competition. The 9th and his Guardians arrive in Japan.

Day 4

Chapter 289: Kaoru Mizuno and Takeshi bodyguard Tsuna while practicing baseball. The Giegue Famiglia send word to the 9th gen that they know who are trying to interfere with the Ceremony and will wipe them out as a gift for the Decimo.

Day 5

Chapter 290: Shitt P! and Hayato's turn to bodyguard Tsuna. Adelheid wipes out the Giegue members.

Day 7

Chapter 291 - chapter 292: Tsuna meets with the 9th. Enma's turn to bodyguard Tsuna.[158]

Day 8

Chapter 292 - chapter 294: Enma tests whether Tsuna is really a "good guy" but the letter he left him gets trashed by accident. Tsuna tells the 9th his decision. But, Kaoru critically attacks Takeshi.

Day 9

Chapter 295 - chapter 298: The Vongola Inheritance Ceremony.[159] Vongola Famiglia vs. Simon Famiglia. The Simon steal Sin and reveal themselves as the culprits who nearly killed Takeshi. The original Vongola Rings are destroyed, but Talbot helps create the Vongola Gear. Shoichi and Spanner contact Tsuna and send him new X-Contacts and X-Headphones.

Day 10

Chapter 302 - chapter 309: Tsuna, Hayato, Ryohei, Lambo, and Reborn arrive on Simon Island, where aside the Simon, Vindice were also waiting.[160] Ryohei vs. Koyo. Memories of the first Key.

Day 11

Chapter 309 - chapter 318: Dawn, Lambo vs. Large. Second memory Key. Byakuran visits Takeshi. "Julie" shows Enma a photo of Iemitsu.[161] Hayato vs. Shitt P! Third memory Key. Tsuna vs. Enma.

Day 13

Chapter 319 - chapter 328: The 9th finds out Enma is connected to the Flood of Blood.[162] Hibari vs. Adelheid. Fourth memory Key. Demon Spade reveals himself. Vongola & Simon vs. Demon Spade. Takeshi joins them. Kaoru loses his "pride." Fifth memory Key.

Day 16

Chapter 329 - chapter 346: Enma's Ring finishes awakening.[163] Demon undoes the Island's protections to lure Mukuro in. Tsuna vs. Enma rematch. Sixth memory Key. Mukuro vs. Demon. Demon takes over Mukuro's body, escapes Vindicare. Vs. Demon. Seventh memory Key. Tsuna manifests Oath Flames. Defeats Demon. As a reward, they receive an eighth memory Key.

Day 23

Chapter 346: Everyone more or less returns to their daily lives...[164] Hibari can now fight the freed Mukuro to his heart's content.

The Curse of the Rainbow Arc

Feb~Mar
Day 1

Chapter 347: Mammon receives a letter from Reborn about the clue on the Arcobaleno Pacifiers.

Day 2

Chapter 347 - chapter 349: In France, the Varia and Kokuyo gang go to recruit Fran. The Arcobaleno gather to read their letters at the Pacifier Spring. Tsuna wonders what the Arcobaleno are exactly.

Day 3

Chapter 349 - chapter 350: Chrome transfers into Tsuna's class. Welcome party thrown for her at Tsuna's house. Reborn dreams of memories past, and the Arcobaleno dream of Checker Face, who proposes the Representative Battle of the Rainbow..

Day 4

Chapter 351 - chapter 353: The Arcobaleno go around asking representatives to fight for them. The Varia arrive in Namimori.

Day 5

Chapter 353 - chapter 355: Byakuran and the Six Funeral Wreaths meet up with the Giglio Nero in time for Uni to materialize from the Sky Pacifier. Wonomichi explains the rules of battle to all the Arcobaleno.

Day 6

Chapter 357: Iemitsu returns home and brings Colonello's team. Byakuran proposes an alliance between Team Reborn and Team Uni.

Day 7

Chapter 358: Reborn decides to accept Byakuran's proposal. They find out Enma's representing Skull.

Day 8

Chapter 358: Team Colonello trains. The new rings Mammon commissioned for the Varia arrive. Skull and Enma plan.

Day 9

Chapter 359 - chapter 364: Day 1 of the Representative Battle of the Rainbow.[165] Team Skull vs. Team Mammon. Tsuna vs. Iemitsu. Team Fon vs. Team Reborn.

Day 10

Chapter 364 - chapter 379: Day 2 of the Battles. Dino goes undercover as a teacher at Nami-Middle. Shoichi and Spanner join up as thier engineers. Team Uni & Team Reborn vs. Team Verde vs. Team Colonnello. Tsuna vs. Iemitsu rematch. Lesson time with Reborn. Team Fon & Dino vs. Team Mammon. The Vindice join the battles by taking Team Skull's place. And attack the representatives while the other Arcobaleno visit Skull in the hospital.

Day 11

Chapter 379 - chapter 393: Day 3 of the Battles. The fights begin right at midnight. Team Reborn & Team Verde vs. Team Bermuda. Reborn and Tsuna learn the truth of the Arcobaleno and Vindice, and the purpose of the Representative Battle. Tsuna goes to see Talbot. Tsuna tells Reborn he's not going to let him die. Tsuna summons all his allies and asks them to fight with him.

Day 12

Chapter 394 - chapter 405: Day 4 of the Battles; the last day. It's the Allied Team vs. Team Bermuda: Basil, Enma, & Tsuna vs. Alejandro, Team Reborn, Basil, Enma, & Flan vs. Big Pino & Small Gia. vs. Jaeger. Tsuna & Reborn vs. Bermuda. Checker Face reveals the truth of the Tri-ni-sette. The Curse is resolved with Talbot's substitute pacifier containers.

Day 13

Chapter 406: Tsuna and crew visit the injured in the hospital. Reborn instigates a pillow fight.

~Apr 2006[166]

Chapter 407 - chapter 409: Reborn shoots Tsuna with a Dying Will Bullet to confess to Kyoko. Reborn leaves after Tsuna denies becoming Vongola Decimo.

~Apr 2006[166]

Chapter 409: (Re)Enter home tutor Reborn, to turn Tsunayoshi Sawada into Neo Vongola Primo.

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  127. Amano, Akira. Katekyō Hitman Reborn! Vongola 77. Tokyo: Shueisha. 2007. Print. p.224
  128. Amano, Akira. Katekyō Hitman Reborn! Vongola 77. Tokyo: Shueisha. 2007. Print. p.225
  129. Amano, Akira. Katekyō Hitman Reborn! Vongola 77. Tokyo: Shueisha. 2007. Print. p.231
  130. Amano, Akira. Katekyō Hitman Reborn! Vongola 77. Tokyo: Shueisha. 2007. Print. p.232
  131. 131.0 131.1 131.2 131.3 131.4 131.5 Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 27: Chapter 253
  132. Amano, Akira. Katekyō Hitman Reborn! Vongola 77. Tokyo: Shueisha. 2007. Print. p.233
  133. 133.0 133.1 Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 25: Chapter 230, "Because senpai was worried we were disappearing one by one in the past, he looked for us all over Japan for five weeks. It made me really happy!" -Takeshi
  134. YazzyDream notes: Japanese school years begin in April and end in March the following year. So, Tsuna and Shoichi's third year of middle school begins in April 2006 and ends on March 2007. On top of that, Tsuna is wearing the Namimori summer uniform in Shoichi's flashback, which is worn from June 1st-October 1st.
  135. YazzyDream notes: Japanese high schools last three years. So, Shoichi finished high school in March 2010. While it's likely he didn't start college until August/September 2010, there's a chance he joined in an earlier semester, so I'll leave it as a possibility.
  136. 136.0 136.1 Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 18: Chapter 163, "Five years ago, Joshima, Kakimoto, and Chrome attempted to break him out, but that resulted in failure. After that, we hadn't been able to track the three of them.....That is, until we heard a strange rumor half a year ago." -10YLKusakabe
  137. 137.0 137.1 Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 22: Chapter 197
  138. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 18: Chapter 156, "It's the Namimori Station Underground Shopping Mall. The construction began ten years ago, and was completed three years ago." -10YLFuta
  139. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 18: Chapter 157, "You know something, Lambo. Up till three years ago, I was in charge of looking after you." -10YLFuta
  140. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 27: Chapter 258, "Sorry to break it to you... But the grandmother you're looking for... kicked the bucket three years ago." -10YLKawahira
  141. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 27: Chapter 252
  142. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 18: Chapter 163
  143. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 16: Chapter 141, "Maman went with Iemitsu to Italy for a holiday five days ago. But we're still unable to contact with them." -Reborn
  144. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 16: Chapter 139, "The Vongola headquarters... fell two days ago and was destroyed." -Lal Mirch
  145. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 16: Chapter 141, "Longchamp and his family, Mochida as well, have been missing for two days..." -10YL Yamamoto
  146. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 16: Chapter 136, "The second day"
  147. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 18: Chapter 156, "Just like Tsuna's been recieving a one-on-one training with Lal Mirch these past ten days, you'll each get your own home tutor to train you, same as during the Ring Battle." -Reborn
  148. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 18: Chapter 156, "13 days later"
  149. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 25: Chapter 231, "My location, when I reached here 10 days ago is Spain." -Basil
  150. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 18: Chapter 162, "It's been three days since the new training started." -Haru during dinner
  151. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 19: Chapter 173, "Three days from now, I'll be back to spar with you as a final test. If you can strike me just once, you pass." -Reborn
  152. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 19: Chapter 166
  153. 153.0 153.1 Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 25: Chapter 230, "And the Vongola Boxes we got yesterday, we tried opening them, but the fights made us exhausted. The rings' Flames were too weak and thus, the box remains unopened. So... in these two days, we rested properly." -Tsuna
  154. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 26: Chapter 239
  155. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 25: Chapter 228, "You'll be informed of details 10 days from now. I won't make a move during that time, so please rest easy." -Byakuran
  156. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 37: Chapter 354
  157. YazzyDream notes: Tsuna is still a second-year student in class 2-A. Technically, that means the events of the Inheritance arc can happen anywhere between right after they got back in December through to March, which is when the school year ends. However, it seems to me that at least some time has passed between chapter 283 and 284. And then there's the Representative Battle Arc which is happening while Tsuna's still in school after this Arc. It also seems more likely that the Simon students would transfer in at the beginning of the new term, which would be early January.
  158. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 31: Chapter 291, "2 Days until the Vongola Inheritance Ceremony"
  159. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 30: Chapter 286, "The Vongola Inheritance Ceremony that will take place in seven days..." -Reborn
  160. "After six days, we'll be completely awake and ready." -Enma
    YazzyDream notes: and since they said there were seven days until the rings were awakened during the Ceremony. That means this is the following day.
  161. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 33: Chapter 314, "Three days have past since the Inheritance Ceremony."
  162. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 33: Chapter 319, "I see... Its been four days since Tsunayoshi-kun and the others left to subdue the Simon Family..." -Timoteo
  163. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 32: Chapter 301, "There's not a second to lose!! We only have seven days until the Simon completes the awakening of the ring!!" -Timoteo
  164. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 36: Chapter 346, "One week after defeating Demon"
  165. Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 37: Chapter 356, "There's one reason in particular that I've come a full four days before the Representative Battle." -Wonomichi
  166. 166.0 166.1 Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 42: Chapter 407 and Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 42: Chapter 409
    YazzyDream notes: At the beginning of chapter 409, the narration says "Peaceful days after the battle" and then Tsuna says, "No school today either, what should I do?" In chapter 409, "One week later" Tsuna attends a regular school day. Considering all of that, and the other parallels Amano wrote to chapter 1, it's likely Tsuna has just finished his second year of middle school and chapter 407 to Reborn leaving is happening in the week break between moving up a grade. Thus, when Reborn returns to tutor Tsuna to be the Vongola Neo Primo, Tsuna is a fresh third year student.
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