Before Dragon Ball
Year/Date
Event
4237 B.C.:The ancestors of Garlic Jr. come to earth from their home, The Makyo Star. 
739 B.C:Princess Snake settles on Snake Way in her castle along-side of it.
238 B.C:The First Primative Super Saiyan is Born.
250 A.D:Baba(Master Roshi's Sister)begins her fortune telling buisness.
261 A.D:King Yamma travels Snake Way to get training from King Kai. Princess Snake meets him and falls in love. On Nameck, violent storms ravage the planet and destroy many of the life giving Ajisa plants. The Son of Katat is sent to away fom the destruction to the planet Earth. But the storms stop and no one follows the child. 
430 A.D:Master Roshi is born.
459 A.D:Tienshinhan's brother, Tao Pai Pai, is born.
461 A.D:Garlic Sr. assaults the throne of Kami for not choosing him as his successor. He is defeated and trapped by Kami. 
The Son of Katat is the chosen one and ascends to the throne. 
The Son of Katat trys to rid himself of all evil, therefore seperating the evil from the good creating Kami & Piccolo Daimaou 
650 A.D:Master 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(Not Goku's Son) is born.
662 A.D.Kami tells Mr. Popo what he remembers about his childhood.
715 A.D.The great Emperor Pilaf is born.
720-730 A.D.The Saiyan's unite on Vegeta and begin a war against the Truffals for control of the planet Plant. A full moon on Vegeta help the Saiyan's to quickly defeat the Truffals. The Saiyan's begin space travel and meet aliens from other planets. 
731 A.D.The Saiyan's begin their partnership with Frieza and start conquering planets for sale. 
732 A.D.The birth of Prince Vegeta.
733 A.D.Bulma, Yamcha, and Tenshinhan are born.
735 A.D.Frieza starts to feel mutiny in the Saiyan's.
736 A.D. Krillin is born
737 A.D.A 3rd Class Saiyan fighter is born to the 2nd Class fighter Bardock. He is rejected 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 Kakorot(Goku). King Vegeta's revolt against Frieza ends in failure with the death of Planet Vegeta along with his own. Bardock dies trying to protect planet Vegeta and his future. Kakorot lands on Earth. The Ox King's daughter Chi-chi is born. His wife dies shortly after the birth. 
June-August.Gohan finds a small baby in the woods. He names him Goku.
738 A.D.Goku hits his head on a rock after falling down a cliff. He stops being a wreckless evil child and becomes a happy loving boy.740 A.D.Oolong is born. Krillin begins his training at the Orinji Temple. 747 A.D.Yamucha meets Puuaru.
749 A.D. First ten days of April Bulma enters Senior High School in the Western City.
749 A.D.Bulma discovers the 2-Star Dragon Ball in her basement.
749 A.D. 22 August
Bulma discovers the 5-Star Dragon Ball in a cave to the north.
Dragon Ball
Date
Event
749 A.D. September 1stBulma is on her summer vacation searching for the Dragon Balls. Bulma meets Goku later that day. Bulma discovers that the sphere Goku owned, which he thought contained his grandfather's soul, was actually the 4-Star Dragon Ball. 
749 A.D. September 2ndIn the morning, Goku and Bulma meet Kami and he gives them the 3-Star Dragon Ball. 
749 A.D. September 5th An elderly woman gives Goku the 6-Star Dragon Ball.
749 A.D. September 6th Goku meets Yamcha for the first time and fights quickly with him, only to have it end in a draw.
749 A.D. September 9thGoku defeats Yamcha 
Master Roshi uses the Kame-Hame-Ha to put out the flames on Frypan Mountain. Unfortunately the blast is too strong and destroys the mountain and the castle. Among the debris, the 7-Star Dragon Ball is found. The Dragon Balls are stolen from Goku and gang. Pilaf summons Shenron. Later, Goku looks at the moon and turns into a giant ape and destroys Pilaf's castle. 
749 A.D. September 10th.Goku and Krillin become Master Roshi's students. Later, Master Roshi moves his house to an island and Goku and Krillin prepare for their tough training with the martial arts master. 
749 A.D. September 14thAt 4:30 AM Goku and Krillin begin their tough training under Kame Sennin. They will spend the next 8 months training this way. 
750 A.D. April 6th.Goku and Krillin increase the weight of the shells on their backs to 40 kg. to increase the results of their training. 
750 A.D. May 6th.Goku, Krillin and Master Roshi leave the Kame House to participate in the 21st Tenkaichi Budoukai. 
750 A.D. May 7th The 21st Tenkaichi Budoukai takes place. Master Roshi wins. Goku takes second place. Goku and Chi-chi meet again in the Ox King's village. 
750 A.D. May 9th Goku begins climbing Korin Tower. 
750 A.D. May 10th Goku reaches the top of Korin Tower and begins his training which is to take the Super Holy Water from Korin. 
750 A.D. May 12thAfter 3 days of training, Goku finally gets the Super Holy Water. He's surprised when he finds that it was only plain tap water. It was actually the fighting to get it that made him stronger. 
Between 750 and 753 A.D.Goku begins his training which is to run around the World. Goku meets Tenshinhan for the first time. 
753 A.D. May 5th Goku swims to Papaya Island where the 22nd Budoukai will take place. 
753 A.D. May 7thThe 22nd Budoukai takes place. Tenshinhan wins. Goku comes in a close second. Krillin is killedm and Piccolo Daimaou appears. 
753 A.D. May 9thGoku kills Piccolo Daimaou. Piccolo is born. 
Goku reaches Kami's Palace and trains there for the next three years with Mr. Popo and Kami. 
756 A.D. May 7th The 23rd Tenkaichi Budoukai begins. Goku becomes engaged to Chi-chi after their fight in the tournament. Goku defeats Piccolo and wins the Tenkaichi Budoukai for the first time. 
757 A.D. Sometime in May.Gohan is born. 
761 A.D.Goku, Piccolo, Krillin and Gohan battle Garlic Jr. and send him into his Dead Zone.(DragonBall Z The Movie: Deadzone)