First, time is the 1D sequential space created by the continuous succession of irreversible changes bounded by a beginning and an end. The changes go from the past to the future through the present creating the 1D sequential space 1D SS). You might think that the ES 1D is an illusion, but it is objective and it is what the clocks measure.
A time interval is a 1D sequential space created by the succession of changes. The beginning and end of the changes are the frame of reference in ES 1D. The measure of the ES 1D is the length of the interval. Time is done on changes, which are its indicator. In ordinary 3D space (3D EO) the points are fixed, static. Objects move in it. The coordinate axes are the frame of reference.
Although the concept of space is used to explain time, these are independent entities. As we have already seen, the points of space are static and the changes dynamic. Time is a continuous doing, changing.
In conclusion:
1) Time is equal to ES 1D (subperceptible), but different from changes (perceptible).
2) ES 1D is the nature of time.