True, man invented clocks, but these devices work independently of their creator's mind. Magnitive Dualism admits the existence of both change and the period or time interval in which changes occur.
To deny time (intervals) is to deny that things have a start and an end and that duration can be divided into equal intervals. It is also to feed a feeling of eternity (a priori) rooted in people's mind.
For the philosopher Henri Bergson duration (changes) is subjective and rejected the mathematical time. Philochrony fuses the two elements of time: change-interval.
Elvis Sibilia, Florida, USA