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 This is so very intriguing to me...for a while I liked to stew over the idea that time is merely all a human construct..that, like money, it's simply another thing humans have created to have some little sort of control over the wildly mysterious and thrashing universe. However, after I read your post, it is all so obvious--it was all right in front of my face. Though complex meanings of time and space do exist, time, at the simplest level that we can understand, does exist in some way. In the biological way, it certainly does exist..like you have said, nature does an excellent job of keeping track of it. It reminds me of a Shakespeare quote from Sonnet 2: "...When forty winters shall beseige thy brow, and dig deep trenches in thy beauty's field"... No one can deny the fact that all humans start out small, and as the days pass, their tissue gets older, they become less resilient, and you can see the seasons (another tracker of time) that, as shakespeare said, rest on their brow. There is no doubt that things are born afresh, they age, then they die, then it repeats. There is a linear sequence to events in our own biological reality. This, I now realize, is simply only one of the limited concepts of time. That it is time within other time. If time, in the grand scheme of things is not linear, but circular, then there must be some sort of mini-clock within certain aspects of that time to keep time. We are the little aspects in the grand scheme of time. I see now the possibility of there being many differing concepts and types of time that exist alongside, inside, outside, overlapping, and apart from each other. So, I again am convinced that our time does exist, but it is only one of many.