Time = Motion
Therefore time is the universal motion.
A characteristic or property of the time or movement is its execution speed, that is to say “The pass of the time.”
--For us to distinguish the movement of a point or object is very simple and we can perceive it perfectly when we observe an automobile in movement for example.
An example of it could be a river in which all their waters take the same direction and similar speed.
--But when the time or universal movement is executed in three dimensions its understanding it is even more difficult still. We notice a movement or flow of time but in all directions and senses at the same time, which confuses us and we end up not understanding what we are observing, to know, a simple three-dimensional movement.
The time therefore is the universal movement in the three dimensions (also four) that we know.
In the universe, each object has its own speed movement according to its characteristics and properties. To this speed we usually call it time pass, aging, etc.
This way in the Cosmos creation, space and time or universal movement unite themselves forming energy and matter later, which also take implicit this time or quantity of movement.
Because well, matter is condensed energy and this matter has the particularity of being able to form bodies and objects, which usually have the same interior speed or pass of time. For this reason we say that such a body or object has certain aging speed, erosion, evolution etc.