Time is not absolute. A lay-man in Physics would find this statement ridiculously strange and uncalled for. What do you mean? Why is the absoluteness of time even an issue? You mean it is relative? relative to what?
Relative to the observer's movement vector.
The reason it is so is that light runs at a limited and constant speed. What??? the relativity of time derives from the speed of light? How do you explain the passing away of time when it is completely dark at night? Well, maybe time won't matter if there is no light at all but when the sun continues to rise and fall, we will have time, not in the sense that you haven't hit the deadline, but time will exist as a dimension of our world.
All these crazy statements above-mentioned, come from one hidden-in-plain-sight fact of physics, well new physics as opposed to the classic, that any physical law exists only when an observer is involved - there is no such thing as absolutely objective truth, especially in science! The observation of scientific "facts" itself interferes with the paths of the observed objects, and you wonder why we don't know the cat is dead or alive? Because to know that will single-handedly change whatever status was there originally, which sadly, can't be told through our own measures, unless you have God's view.
Of course it is not saying that if you don't look at (observe) the sun, then the sun is not there - that would be superstition. You don't have to keep looking at it for it to exist. Sure its existence is independent of any individual's consciousness. But if the Sun's effects(including its own image) were not observable and detectable in any way mankind could ever conjure, then it wouldn't exist to us. Hence, there is no absolute time because there is no way to have absolute simultaneity with any event that transpires outside our current frame of reference, and time dilates when the object of observation is moving relative to the observer.
I can encapsulate the whole crazy special relativity thing with one sentence: time passes in apparently different manners because light from events has to play catch up with the moving observer. And the general theory of relativity only adds one thing: gravity pulls the leg of light.
God said:" Let there be light, and there is light." Before He created anything else. So light alone leverages our whole space-time.
