Time is a derivative function of state change that progresses relative to E within the inertial frame(s) in which it is observed.
So simple a 2nd grader could understand it without being relatively special.
Mine is in English and I like it better!
BTW some relatively(like that!) new work in physics says that the “observed” part could be misunderstood. The local university Physics chair(an advisor to one of my offspring) tells me to watch for a paper this Summer with a new theory on time and observing it. Of course the writing of papers regarding time and quantum entanglements etc is one of the current rage(s) in Physics. I suspect driven by the CERN experiments with particles. Got to show all those billions were not wasted.
Lol