IN PHYSICS – there is no special reason. Our understanding of the universe says a ball can roll left to right or right to left, the same physics says time goes left to right or right to left.
As u/johnkapolos says – “what *is* time?”
The only way we can really describe time in physics is “it’s a one way thing”, like a ball rolling down a hill. The ball can’t magically jump back up and return to where it started (without someone “outside” picking up the ball and replacing it).
I won’t bore you with thermodynamics but the *only* other place we see something “one way” like this has to do with heat. Heat always flows in one way unless someone “picks it up and puts back where it started”. That’s the only thing we see in physics that works like time is heat so we *think* time and heat must be related and what you and I think of as “the passage of time” is really “the passage of heat”, but that’s getting sorta philosophical.
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