We perceive time by change. Memory is changes in your brain. Given a shuffled sequence of snapshots of the universe, your own state included, you would always perceive them in the ‘right’ order. So there does not appear to be any need for an actual passage of time. What does matter is that adjacent states exist with consistent relationships. See e.g. Julian Barbour’s “The End of Time”
via Why do lots of people think time isn’t real?.
But you might ask “What about clocks?” We have sophisticated machines, like atomic clocks, to measure time. But measuring “time” doesn’t prove its physical existence. Clocks are rhythmic things. We use the rhythms of some events (like the ticking of clocks) to time other events (like the rotation of the earth). This isn’t time, but rather, a comparison of events. We called these manmade devices “clocks.”
From a biocentric point of view, time is the inner process that animates consciousness and experience. The existence of clocks, which ostensibly measure “time,” doesn’t in any way prove time itself exists.
We’re living through a profound shift in worldview, from the belief that time and space are entities in the universe to one in which they belong to the living. Only for a moment, while we sort out the reality of time and space not existing, will it feel like madness.