You are equating change with time. They are not the same. Time is a construct. Change is the nature of a thing.
We create time out of the revolution of the earth around the sun and a rotation of the earth. It is earth specific. The same period of time does not occur in any other celestial body. Thus, time is a construct of this place in this solar system.
The planet Uranus takes 84 earth years to circumvent the sun. A day is equal to our 17 hours. Time is relative, as such it has no singularity. It is a construct.
“Time is a construct.”
The language we use to talk about time is a construct, but time itself exists outside of man’s consciousness - just as does space.
Euclidean geometry is a man-made construct we use to describe space, but space exists independently of it.
The Gregorian calendar is a man-made construct we use to describe time, but time exists independently of it.
Time has existed since the beginning of…. …time.