“I’d like to hear “what Dhamma explains about how we can know that time flows in one direction, from the past to the future.” This question has not been solved yet.”
Well. There are so many “unanswered questions.”
– If we spend our time solving “unanswered questions,” we will not have time to stop future suffering.
It is informative to read the “Cūḷamālukya Sutta (MN 63).”
– The Buddha clearly stated that spending time on such issues is a waste of time.
– What benefit is to learning about those issues?
P.S. Such issues are not discussed in Abhidhamma if that is what you need to know.