Scientology Axiom 9
Axiom 9: Change is the primary manifestation of time.
Whatever manifestations time has I think there is no argument that change is the primary one. It is actually hard to think of other manifestations and over the years man has always defined time in terms of change, e.g., the International System of Units defines a second as (simplified version) the duration of 9,192,631,770 vibrations of a certain wavelength of radiation. So they are using change to define time. Some philosophers have gone over the top on time probably because it is such a simple thing and they never figured out where it came from. Many philosophers seem to be rather adverse to the idea that something could have a simple explanation. Physicists seems to also be incapable of viewing time simply.
In Axioms 7, 8 and 9 time is fully defined and the simplicity of it is demonstrated.
Just as an aside I can think of one other major manifestation of time: persistence. Take a few minutes and see if you can think of any more.