Warning: Time Stretch has been known to cause spontaneous combustion, but not really.
The universe is still in its early stages of development. Time is not yet a concept.
Ancient Civilizations: The First TimewastersTime starts to become a thing. People begin to think about it. Mostly in relation to waiting for the next meal.
Middle Ages of Time: When Days Were Measured in Candles Industrial Revolution of Time: Timekeeping Becomes a Thing (But Not Really)Time becomes a currency. People trade it for things they can't afford. Time travel becomes a thing, sort of.
Time Travel Gate: When the Future Was Invaded by the Past Time Banks: Where Time Deposits and Withdrawals are a ThingTime is stretched, compressed, and bent. The past, present, and future are one big mess.
Time Quantum: Where the Rules of Time Are Optional