I believe that time, at least as we experience it, is a form of movement.
You see, we're always moving forwards one second at a time, but we're aware of how far we've moved, and how fast we're moving, even though we have no control over it.
Time doesn't end when we die, we just no longer have an awareness of it or ability to measure it at that point. If we have a soul, then I think at the point of death that soul is on a different plane from the material world we experience, and gains the ability to move through time the way we move through space.
As a child time is long and as an adult it is too short.
I'm finding that to be true as I fly ever forward into adulthood. And I don't like it!
I don't think that we really know what time is. Though it seems necessary for things to exist. Describing time as the fourth dimension really makes sense to me. I mean....for matter and energy to actually exist they need some sort of playing field to move. Everything needs movement because at the molecular level atoms and electrons and quarks and who knows what else are buzzing around. They need space and they also need time. One molecule is here one millisecond (an atom over there) and then here the next millisecond. Time allows things to move through space in some sort of sequential order. If time didn't exist would everything be everywhere at once or nowhere at all?
And at absolute zero when molecules stop moving, does time stop? Probably not because there are most likely little sub-sub-atomic particles still moving around.
So I think time is a vehicle for the universe to exist coherently. (But that still really doesn't define it..........I'm not so sure we really can).
Time is an abstraction. In reality, only a sequence of events exists. Theoretically, something is always happening, some event. The idea of time comes from placing these events in succession. We then divide this sequence of events into segments based on some observable standard, which is also an event. (In the SI system, it is the period of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom, whatever the heck that is. One second is equivalent to 9,192,631,770 of these.) One "segment" consists of whatever events occur within one iteration of whatever we define as our standard.
Time is but a single simultaneous infinitely unfolding moment in which you [we] are always dying, growing, and being reborn again in multitudinous forms.
"It is said" that there is a Spirit Mountain. It is said that at the base of the Mountain, there gather many seekers day and night. They each have unique paths to travel and each spirals in it's own unique way towards the top. In the beginning one sees only one's one path and even at then, quite dimly and has little or no recognition of all the other paths that exist on the mountain. BTW, this "Spirit Mountain" is vastly larger than the known Universe much less Earthly mountains or Even Earth or her Solar system or her Galaxy or her own known Universe.
Then, it is said that the higher you climb upon the mountain, the wider the range of your vision and you can see more and more paths as you climb. It is further stated that the air at the higher altitudes gains more and more rarities of effects. Things that may have made you or others sad or angry at one time now seem to cause excitement in you.
I have also heard it said that when seekers from different paths look from the higher perspectives that they are startled that their paths have so many parallels.
I have been speaking forever about this and will do so forever. < Er, by "It is said" I am pretty much saying I make stuff like this up continuously.