There are no such things as the past or the future. There is no such things as now. As we think it or say it, it evaporates.
All things that have happened exist only in memory or in books or other media, which are examples of apparent stasis but, in truth, are subject to the same natural law as everything else. That law is this: everything changes. Time is not a linear process. Time is a misnomer for change. Entropy, if you like. Everything changes. Everything changes at different rates. That’s why ‘time’ is relative. That which we call ‘time’ is simply the rate of change. Compare the lifespan (rate of change > death) of a Mayfly and a Galapagos Tortoise.
That is all. For now.