We only need the concept of time because things don't happen all at once.
How do we really know whether there's situations where time has no real meaning?
We live in a spacetime' universe but it doesn't follow this is the one and only kind of universe there is.
It appears to us there is, but how do we really know? For example, we are used to living with gravity but perhaps there are regions of space where gravity has no, or at least negligible effect. Whether this would permit the existence of life in any form is dubious, so maybe nobody would know about it anyway.
What about time inside of a black hole? Does time have any meaning in that situation? If so, how would time behave? Just because we could not survive the unimaginable forces inside a black hole doesn't mean time and space would cease to exist, even if in a very different form.
When somebody dies, they (to the best of my knowledge) cease to be involved with time, from a subjective point of view. So from this, can we define time as function of consciousness?
But even if we can, there has to be something that interacts with our perceptions that results in what we call 'time.'
Is time really there when unobserved? This seems impossible to test because there has to be an observer in the first place to do the experiment which actually invalidates it.
What about a rock and time? Does a rock need time to continue to be a rock? A rock is not self-aware (I don't think) so how would a rock know anyway?
When did time come into existence? The usual answer is to say time effectively began with the birth of the universe, however, there's a problem here.
Where was time before the universe began? Even if we could answer this question we could go back further and even further to infinity and still not arrive at a satisfactory answer. So this question seems to become meaningless.
Maybe time is not a single entity but there are different 'kinds' of time that evolve and what we see as 'our time' is simply one of many manifestations of it.
Maybe the real truth is that time is 'in the eye of the beholder.'
Edited by webplodder, 27 April 2017 - 04:03 AM.