Science has a way of claiming to have all the answers of history, and yet it has not satisfactorily defined time itself.
Time is a construct. The Master of the Universe is the Superset, Time is a Subset. The Master of the Universe is beyond time.
"OK... 'Time' is what happens between now... and... NOW!
No, wait... Sorry...
Between now... and... NOW!
Oh rats... Give me a second here...
Tell you what. Can you come back a little later on? By then I should have an exact definition of time, and be able to demonstrate it to you."
Mark