Timeline

*1984,
**February,
***February 19, Bruce Wayne is born. 
*1985,
**May,
***May 16, Oliver Queen is born. 
**June,
***June 18, Kal-El is born. 
*1994,
**September,
***September 28, Thomas and Martha Wayne are murdered by Joe Chill. 
*1998,
** Bruce Wayne leaves Gotham City, beginning his worldwide training. 
** Hank Hall is born.
** Don Hall is born.
** Dawn Granger is born. 
*1999,
**March,
***March 21, Dick Grayson is born. 
*2000,
** Roy Harper is born. 
*2009,
**March,
***March 2,
**** Bruce Wayne returns to Gotham City in secret. 
**April, 
***April 13,
**** Bruce Wayne debuts as Batman. 
*2010,
** Hank Hall and Don Hall debut as Hawk and Dove. 
*2011,
**June,
***June 26,
**** John and Mary Grayson are murdered by Tony Zucco. 
**** Bruce Wayne adopts Dick Grayson.
**October,
***October 7, 
**** Oliver Queen is rescued by Chinese fishermen.
**** Oliver Queen returns to Star City. 
***October 10,
**** Oliver Queen debuts as Green Arrow.
**November,
***November 1,
**** Dick Grayson begins his training to become Robin.
***November 4,
**** Batman and Green Lantern meet for the first time, investigating a Parademon incident in Gotham City.
**** Superman attacks Batman and Green Lantern, the three eventually coming to a stalemate. 
**** Victor Stone gets turned into a Cyborg.
**** Batman rescues Superman on Apokolips, regrouping in Metropolis.
**** Superman, Batman, Green Lantern, Wonder Woman, Flash, Cyborg and Shazam defeat Darkseid, sending him back to Apokolips. 
***November 5,
**** The seven found a team, getting coined the Super Seven by Shazam.
**** Steve Trevor becomes the team's government liason.
***Between November 5-November 11,
**** The Super Seven is renamed to the Justice League, due to it being preferred in focus groups.
***November 11,
**** Cyborg is attacked by Atlantean soldiers on the submarine.
**** The Justice League assists the Atlanteans in defeating Ocean Master.
**** Arthur Curry debuts as Aquaman.
***November 12,
**** Arthur Curry becomes the new King of Atlantis.
**** The Justice League cements their team, Aquaman joining them. 
*2012,
** Roy Harper debuts as Speedy. 
**April, 
***April 1,
**** Dick Grayson debuts as Robin.
**** Batman and Robin defeat the Scarecrow, sending him to Arkham Asylum. 
**May,
***May 25,
**** The Fearsome Five teammup with Starro, attacking Metropolis.
**** The Justice League, along with Robin, defeat Starro and the Fearsome Five. 
**** The Fearsome Five are sent to Stryker's Island Penitentiary.
*2014,
**November,
***November 17,
**** Robin and Kid Flash defeat Mister Twister in San Francisco.
**** Robin and Kid Flash found the Teen Titans. 
***November 18,
**** Titans Tower begins construction, with funding from Bruce Wayne. 
***December 25,
**** Speedy joins The Teen Titans, being their first recruit. 
*2015,
**May,
*** Titans Tower completes construction, becoming the new base of the Teen Titans. 
***May 8,
**** Mister Twister returns, attacking San Francisco.
**** Hawk and Dove help the Titans defeat Mister Twister, officially joining the team.