Time was the measurable structure of keeping track of the sequence of events in the universe. It was kept track of using years, centuries, millenniums etc.
- 30,000 BC: The Invasion of Earth.
- 4357 BC: Dzamor and Incubus are born.
- 1918: World War I ends.
- 2013: Kal-El reveals himself to the the world.
- 2016: The Justice League are formed.