Before Dragon Ball
Date	Event
Over 100 million years B.C.	Earliest Kaiou Samma is thought exist
About 75 Million years B.C.	The 15th generation Kaioushin, Rou Kaioushin, is sealed in the Z Sword.
About 5 Million years B.C.	The evil magician Bibidi is successful in creating Buu. Buu destroys hundreds of planets in the following years. Four of the five Kaioushins are killed by Buu. Dai Kaiou is absorbed by him, giving him a fat appearance. West Kaioushin manages to kill Bibidi and leaves Buu's sphere shell on Earth.
Tens of thousands of years B.C.	Annin begins her service of protecting the Furnace of Eight Divinations on the border between the real world and the "Other World".
4237 B.C.	Garlic Junior's ancestors migrate to the Earth from their home, Makyo-sei.
739 B.C.	Jadoushin becomes the Princess of Serpent Path, and settles in her castle along-side of it.
Approximately 238 B.C.	The Legendary Super Saiya-jin appears and wreaks havoc across the Universe.
Approximately 250 A.D.	Uranai Baba begins her fortune telling buissnes.
261 A.D.	Enma Daiou travels the Snake Path to get training from Kaiou Samma. Princess Snake meets him and falls in love. On Namek, violent storms ravage the planet and destroy many of the life giving Ajisa plants. Kattatsu sends his son away on a space ship to avoid death. But the storms stop and no one follows the child. The child faces problems and is forced to make a landing on the planet Earth. The young Nameckian's name is....Piccolo.
430 A.D.	Muten Roshi is born. Here comes trouble ladies.
431 A.D.	Piccolo becomes the apprentice of Kami.
448 A.D.	Muten Roshi turns 18 and continues training under Mutaito. He falls in love with Ran-Ran, (A distant ancestor of Ran-Fan perhaps? They both look alike.)
459 A.D.	Tsurusennin's brother, Tao Pai Pai, is born.
461 A.D.	Garlic assaults Kami for not choosing him as his successor. He is defeated and trapped by Kami. Piccolo is the chosen one and ascends to the throne of Kami. The evil in Kami's heart leaves him and forms Piccolo Daimaou. Daimaou leads a reign of terror across the Earth, but is sealed in the Denshi Jar by Mutaito's Mafuba technique. Mutaito dies as a result of performing the move.
474 A.D.	Darbura inspects the Earth.
Approximately 550 A.D.	The first Saiya-jin land on the planet Plant in a mysterious ship.
553 A.D.	Muten Roshi starts his world famous collection of dirty magazines.
Approximately 650 A.D.	Muten Roshi finds the 3-Star Dragon Ball washed up on his beach
650 A.D. May 7th	The first Tenkaichi Budoukai takes place.
658 A.D.	Gohan is born.
662 A.D.	Kami tells Mr. Popo what he remembers about his childhood.
698 A.D.	Toninjinka is born.
715 A.D.	The great Emperor Pilaf is born.
720-730 A.D.	The Saiya-jin unite and begin a war against the Tsufuru-jin for control of the planet Plant. The Tsufuru scientist Dr. Raichi is killed. The Tsufuru-jin are completely destroyed by the Saiya-jin. The Saiya-jin take control of the planet and re-name it Vegita. They adapt Tsufuru technology. The Saiya-jin begin space travel and meet aliens from other planets.
722 A.D.	General Blue from the Red Ribbon Army is born.
730 A.D.	Tao Pai Pai starts his career as an assassin.
731 A.D.	The Saiya-jin begin their partnership with Freeza and start conquering planets for sale. King Vegita marries his queen.
732 A.D.	The birth of Prince Vegita.
733 A.D.	Buruma, Yamucha, and Tenshinhan are born.
733, May 8th	Earth's current king is sworn in.
Approximately 735 A.D.	Freeza starts to feel misgivings toward the Saiya-jin. It begins a period of controlled chaos.
736 A.D.	Kuririn is born
737 A.D.	A Low Class Saiya-jin fighter is born to the Middle Class fighter Bardock. He is rejected by his father as a failure. In his first few days alive he's sent to the planet Earth to destroy it when he grows older. His name is Kakkarotto. Planet Vegita gains control of the planets Meat and Kanassa. King Vegita's revolt against Freeza ends in failure with his death. Freeza demands the death of all Saiya-jin. Bardock dies trying to protect planet Vegita and his future. Kakkarotto lands on Earth. Gyu Maou's daughter Chi-chi is born. His wife dies shortly after the birth.
Sometime in between June and August	Gohan finds a small baby in the woods. He names him Son Gokou.
738 A.D.	Gokou hits his head on a rock after falling down a cliff. He stops being a reckless evil child and becomes a happy loving boy.
739 A.D.	Gyu Maou and his daughter at the foot of the mountain o which their castle is atop. A fire spirit is unleashed and sets Mount Ryokei afire. Gyu Mao and his daughter are trapped at the bottom of the mountain. The mountain is renamed Mount Frypan.
740 A.D.	Oolong is born. Kuririn begins his training at the Orinji Temple. Bebi creates Dr. Myu for the purpose of gathering energy so he can be reborn. Myu is programmed to make Ruudo and all of the other Machine Mutants.
747 A.D.	Yamucha meets Puuaru.
748 A.D.	The Pheonix Muten Roshi was raising dies of food poisoning. Later, while gathering mushrooms, he discovers a baby sea turtle who got lost.
749 A.D. First ten days of April	Buruma enters Senior High School in the Western City.
Sometime in 749 A.D.	Buruma discovers the 2-Star Dragon Ball in her basement.
749 A.D. 22 August	Buruma discovers the 5-Star Dragon Ball in a cave to the north.

Dragon Ball Z
Date	Event
761 A.D. October 12th	Raditzu arrives to retrieve his brother. Gokou sacrafices himself, and he and Raditzu are killed by Piccolo's Makkankosappo. Vegita and Nappa stop at a small planet named Arlia. After finding the planet in unsuitable for sale, they destroy the planet. After this, they go into a state of suspended animation in a cold sleep. They're headed for the planet Earth.
A period of several months	Gohan begins his survival training. Gohan falls into ancient ruins and finds a robot. After a disaster, the robot is destroyed. Gohan becomes more mature. Yamucha is employed as a professional baseball player. Gohan becomes homesick and tries to escape from his training area and return home. After meeting Pigero and other orphans whose parents where killed in a tsunami, he regains his courage and returns to his training.
762 A.D. Some time in March.	Kuririn, Chaozu, Yamucha, Tenshinhan and Yajirobe are training at Kami's Palace.
762 A.D. April 29th	Gokou arrives at Kaiou Samma's planet.
762 A.D. May 9th	Gokou finally catches Bubbles. His next training is to hit  a cricket Gregory with an incredibly heavy hammer.
762 A.D. May 23rd	Gokou bops Gregory on the head with the hammer.
762 Some time in May.	Kuririn, Tenshinhan, Chaozu and Yamucha make a spiritual travel to the old planet Vegita. They are all easily killed by two weak Saiya-jin. When they return to their bodies, they all decide to continue training hard.
762 A.D. November 2nd	Gokou is resurrected after having completed his training under Kaiou. (Just a little plot hole here. Shenron can't resurrect anyone if they've been dead for over a year, and since he died in October, this is a bit of a plot hole. But since this is the way it's written in the book, this is how I have to write it.)
762 A.D. November 3rd	Vegita and Nappa arrive on Earth. Gohan, Piccolo, Tenshinhan, Kuririn, Chaozu and Kuririn face off against the Saiya-jin. Nappa, Yamucha, Piccolo, Tenshinhan and Chaozu are all killed. The battle between Gokou and Vegita ends in a draw. A micro-sized robot made to look like an insect is deployed by Dr. Gero to collect blood samples from the strongest fighters for use in the construction of Cell.
762 A.D. November 4th	Gokou, Kuririn and Gohan are hospitalized in the East City Hospital.
762 A.D. November 7th	Kuririn and Gohan leave the hospital.
762 A.D. November 9th	The reconstruction of Kami's spaceship is completed.
762 A.D. November 14th	Buruma completes her lessons in the Nameckian language. Gohan, Kuririn and Buruma leave for Namek.
762 A.D. November 21st	Vegita lands on Freeza Planet Number 79.
762 A.D. December 13th	Vegita's injuries are completely healed. He leaves immediately for planet Namek.
762 A.D. December 18th	Vegita, Kiwi, Buruma, Kuririn and Gohan all land on Namek at about the same time. Gokou leaves for Namek. Dende takes Kuririn to meet the Saichourou. Piccolo, Tenshinhan, Chaozu and Yamucha arrive at Kaiou's planet and begin their training there. Gokou's spaceship gets trapped in the gravity of the star Alpha HZ. By using the Kame Hame Ha he is able to escape a fiery demise.
762 A.D. December 19th	Zarbon takes Vegita's beaten body to Freeza's ship to heal him.
762 A.D. December 20th	Vegita fights Zarbon for the second time. He kills him. Kuririn takes Gohan to meet the Saichourou. By Freeza's order, The Giniyu Tokusentai's mission to Yardrat is delayed. They leave for Namek.
762 A.D. December 23rd	Gokou completes his training under 100g gravity.
762 A.D. December 24th	The Ginyu Tokusentai are destroyed. Piccolo is revived. Kuririn is killed. Gokou becomes the Legendary Super Saiya-jin and defeats Freeza. The planet Namek blows up.
763 A.D. May 3rd	Kuririn and Yamucha are revived by the Nameckian Dragon Balls.
763 A.D. September 9th	Tenshinhan and Chaozu are revived. The refugee Nameckian's are transported to New Namek by a wish to the Nameckian Dragon Balls.
763 A.D. Sometime in October.	After 5,000 years the Makyo-sei approaches Earth and Garlic Jr. is freed from his Dead Zone. But he is again defeated by Gohan and trapped for good in the Dead Zone since the Makyo-sei is destroyed.
Exact Date Unknown	Cell arrives in Trunks' Time Machine and goes underground to absorb nutrients. Freeza's cyborg body is completed.
764 A.D. Some time in August.	Trunks arrives. He kills Freeza and King Cold. Gokou returns to Earth.
Unknown Dates	Vegita undergoes gravity training to become a Super Saiya-jin. A relationship slowly develops between Vegita and Buruma. Gokou and Piccolo attend driving school to get their driver's licenses. Cooler arrives on Earth. He's defeated by Super Saiya-jin Gokou.
766 A.D.	Trunks is born.
767 A.D.	Goten is born.
767 A.D. May 7th	The 24th Tenkaichi Budoukai takes place. Mr. Satan is the winner.

767 A.D. May 12th	All of the Artificial Humans appear. Cell shows up later that day. Piccolo and Kami fuse. Piccolo is temporarily the strongest character. Gokou suffers from his viral heart disease. The Cell of the present is destroyed along with Dr. Gero's underground lab by Kuririn and Trunks.
767 A.D. May 15th	Gokou's heart disease is cured by the medicine Trunks brought from the future. Vegita and Trunks enter the Room of Spirit and Time.
767 A.D. May 16th	Cell reaches his second stage. Cell reaches his perfect form. Gokou and Gohan enter the Room of Spirit and Time.
767 A.D. May 17th	Cell announces the Cell Game to the entire World. Gokou and Gohan exit the Room of Spirit and Time. Piccolo enters it.
767 A.D. May 18th	Piccolo exits the Room of Spirit and Time, Vegita enters it again. Gohan enters Lime's village and saves it from Barbon's evil intentions.
767 A.D. May 19th	Gokou and his family go for a picnic. At around noon, Cell single-handedly destroys the Royal Army. Dende becomes the new Kami. Vegita exits the Room of Spirit and Time. Trunks enters.
767 A.D. May 20th	Trunks exits the Room of Spirit and Time.
767 A.D. May 26th	At 12 noon the Cell Game begins. Gokou dies a second time by sacraficing himself to save the Earth. Gohan completely destroys Cell.
767 A.D. May 27th	Gokou's funeral. Trunks returns to his time.
767 A.D. Between May and June.	Gokou visits Dai Kaiou's planet and meets Dai Kaiou. Gokou particpates in the Annoyoichi Budoukai which was planned in "honor" of North Kaiou's death. Gokou fights Pikehan. He finds him to be similar to Piccolo by his fighting and training style. Chibi Trunks takes his first steps. A documentary is broadcast on TV covering the events of the life of the World Champion Mr. Satan.
768 A.D.	Doll-taki is employed by Dr. Myu. His task is to gather energy to awaken M2's greatest Machine Mutant, Ruudo. Doll-taki does his job well and gets to work on gathering energy on planet Ruudo.
770 A.D.	Kuririn and No. 18 get married.
771 A.D.	Marron is born.
773 A.D.	Kaioushin and Kibito travel to Earth to search for the sphere in which Majin Buu is sealed.
774 A.D. March 28th	Gohan finishes the first grade level at Orange Star High School.
774 A.D. April 7th	There's a sighting of the Golden Haired Warrior in Satan City Gohan begins the second grade level at Orange Star High School. He meets Videl. Gohan meets Buruma at 3 PM. She works on a transformation suit for him so he can disguise himself when fighting crime. She finishes at 5 PM. The Great Saiyaman appears for the first time!
774 A.D. April 8th	Videl discovers that Gohan is the Great Saiyaman.
774 A.D. April 9th	Gohan teaches Videl how to fly. Southern Kaiou checks out Gokou's training.
774 A.D. April 10th	Vegita finds out that Chibi Trunks is able to turn Super Saiya-jin.
774 A.D. April 20th	Videl masters the flying technique.
774 A.D. May 7th	The 25th Tenkiachi Budoukai takes place. Gokou returns to Earth for a single day to compete in the tournament. Majin Buu appears. Vegita sacrafices his life trying to defeat him. Buu kills Babidi. Due to turning Super Saiya-jin 3, Gokou is forced to return to the after-life early. Gohan mistakenly frees Rou Kaioushin from the Z Sword. Rou Kaioushin begins the ceremony to upgrade Gohan's power. (On a side note, if you ask me, all of these events seem to take place over a longer amount of time. I think the writers of the Daizenshyu may have messed up. I believe these particular events were spread out over a period of two days, but who am I to argue.)
774 A.D. May 8th	Piccolo, Gotenks and Gohan are absorbed by Buu. Buu kills almost every single person on Earth. Rou Kaioushin gives Gokou his life allowing him to return to Earth. Vegita returns to Earth with the help of Uranai Baba. Buu destroys the Earth. Porunga restores the Earth. Vegita's life is restored when all of the good people who died are wished back to life. Gokou destroys Buu with the Super Genki Dama.
774 A.D. September 7th	Shenron erases everyone's memories of Buu.
778 A.D. May 7th	The 26th Tenkiachi Budoukai takes place. Mr. Satan is the winner. Buu comes in second.
779 A.D.	Pan is born to Gohan and Videl.
780 A.D.	Bra is born to Vegita and Buruma.
781 A.D. May 7th	The 27th Tenkiachi Budoukai takes place. Mr. Satan wins. Buu comes in second place.
784 A.D. May 7th	The 28th Tenkaichi Budoukai takes place. Gokou leaves with Uub to train him.