No one invented time; it was merely discovered.
Early humans were aware of time passing and at some point began marking it.
Archeologists continue to uncover ancient civilizations that devised elaborate methods of keeping track of the movement of the sun and the stars.
Stonehenge is one example.
The earliest clock, a shadow clock similar to a sundial, dates back to 3500 B.C.
The hourglass dates back almost as far.
As cultures advanced, the mechanical clock was invented and then the pendulum clock.
By the 18th century, more and more people had access to clocks and watches and were able to keep time more accurately themselves.
Today we use a 24-hour clock and have the world divided into 24 time zones.
The zones start at zero at the original site of the Greenwich Observatory in Greenwich, England.
We go by what is called the Scientific Standard of Time, based on the second, which is defined by scientists as “the duration of 9,192,631,770 periods of radiation” and in other circles as “one Mississippi.”