Three main concepts regarding time travel existed in the DC:
Fixed Time: The past cannot be changed. Events will conspire to prevent any meaningful changes to history. In some cases a time traveler is forced to be part of the very event they were to observe and make sure it happens as recorded. In others a person will become a phantom unable to interact with events.
Plastic time: history can be changed, but there can be consequences of doing so.
Parallel Universes: time travel to your actual past or future is impossible, and all time travel does is either shift you into a parallel universe or into an alternate timeline. In some cases travel to "the" future was actually travel to an parallel Earth with a similar but also different history.
The concept of hypertime can be viewed as a strange version plastic time.
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