2300 A.D.
From Chrono Compendium
Lavos Timeline
-Mother Brain murders humans at the Geno Dome. -Lavos reigns from atop Death Peak. Lavos may in fact be Death Peak. -A single Nu exists in the Keeper's Dome. -Robo remains unrepaired. -Belthasar lives at the Keeper's dome. -Doan, of the Guardia family line, directs the Arris Dome. -A deceased resident of the Arris Dome holds the seed of life. -Belthasar finishes the Epoch.
Keystone T-1
***CRONO'S ACTIONS IN LAVOS TIMELINE*** -Crono, Marle, and Lucca warp in from 1000 A.D. after being chased by the Chancellor. -Crono, Marle, and Lucca learn of the Day of Lavos in the Arris Dome, controlled by the Guardia Family line. -Crono, Marle, and Lucca decide to save the world from Lavos. -The seed of life is planted in the Arris Dome. -A man from the Arris Dome makes his way through the ruins and plants a seed from the Seed of Life in the Trann dome. -Crono, Marle, and Lucca discover Robo and repair him. -Robo decides to help save the world; the party then warps to the End of Time. -Belthasar finishes the Wings of Time, and passes away. -Crono's party warps in from 65000000 B.C. to access the Wings of Time, aka Epoch. -Crono's party warps back to 12000 B.C. -Crono's party warps from the End of Time to ask Belthasar's Nu about the Chrono Trigger. -Crono's party warps to 1000 A.D. to retrieve a clone of Crono from Norstein Bekkler. -Crono's party returns from 1000 A.D. with the clone. -The Nu instructs Crono to climb Death Peak with the help of some Poyozo dolls. -Crono's party switches the Nu off. -Crono's party climbs Death Peak, fighting Lavos spawns along the way. -The Chrono Trigger is shattered by the Pendant at the peak of Death Peak. -The magic works; Crono's party is sent to the moment in which Crono died, but time is frozen. -Crono's party replaces Crono with the doll, and returns to the End of Time. -Crono's party warps in from 1000 A.D. to defeat Mother Brain at the Geno Dome. -Crono's partly, with Robo in the lead, defeats Mother Brain. Robo is forced to kill his former love since she has been brainwashed by Mother Brain. -Crono's party flies to the Sun Palace, which has surfaced, to obtain the Sun stone. -The Son of Sun attacks Crono's party. It is the Sun stone, resisting with its last bit of energy. -Crono's party defeats the Son of Sun, and obtains the Sun stone -- Now a moon stone. -Crono's party warps to 65000000 B.C. to recharge the Sun stone. -Crono's party returns to 600 A.D. -Crono's party warps in from 1000 A.D. to pick up the Sun stone. -Crono's party warps back to 1000 A.D. to Lucca's house to craft the Sun stone. =Robo and Doan arrive here from 1000 A.D. to find a better future. ***HISTORY AFTER LAVOS IS DEFEATED (KEYSTONE T-1)*** -Belthasar arrives here with, as suggested by the game, a laboratory from Zeal. -FATE is completed by integrating the Mother Brain design with a more powerful supercomputer. *The Prometheus circuit is also installed in FATE, erasing record of its detection. The circuit may very well be the living embodiment of Robo. *Belthasar learns that Schala is trapped within the Time Devourer, and that the resulting being can devour time itself. -Belthasar, in an unbelievably well-intentioned and complex act, plans the events of Chrono Cross so that Serge is empowered to defeat the Time Devourer and free Schala. -Belthasar builds the Neo-Epoch.
From: Chronology