What object does time represent, in order that we can show it exists?
All objects. All objects exhibit entropy, therefore change and change is a measure of time passing.
And change and movement are the same process.
Time represents the property of movement/change (movement IS change) and as such, would not exist without objects.
You've created quite a house of mirrors for yourself. I do hope you find your way out.
Truly the universe is a kind of house of mirrors, but I didn't create it, I am experiencing it.
So are you and all of us.
Now, this signifies that 'we all' are observers and without us within this universe, without consciousness within this universe, this universe might as well not exist.
See?
In order for something to be said to exist or time to be said to be seen as a property of that which is seen to exist, consciousness has to exist.
The observer (consciousness) is required as the fundamental property to anything existing.
(just to bring it back to the thread topic)
If a consciousness from the future were able to somehow go back to our present and enter a form in which it could then use to insert ideas into this present which would help change that future, then it may be possible for the reverse to be done too.
In order for this to be done, time would somehow have to be moved out of and back into, and if time is the property of this universe, then that would mean having to somehow leave this universe at this present point and enter it again at the future point and visa versa.
Therefore, in order to be able to do this, there would have to be another 'place' outside of this universe for the consciousness to go.