(Here’s a disjointed, rambling response - all my opinion)
Time is a dimension that we impose on reality, as we impose other dimensions.
Dimension (wiki) - the minimum number of coordinates needed to specify any point within space or an object [existence, if so inclined]
From the absolute surface (mis)understanding I have of McTaggart’s critique…
Past - Present - Future could be compared to left - middle - right:
A relative direction with respect to our current position.
As our sense of moving along a dimension unfolds, the arrangement of objects also moves relative to us.
[Time is a dimension we do not have a sense of capacity to move freely around.]
It is us that has the sense of change, but we exist in multiple locations - with slight deviations.
You exist in 2022, as you exist in 2023, but not identically.
Many things could be said to exist in multiple locations,
but a ‘thing’ itself is a description by us -
a line we draw in the sand that may brush over intricacies in the name of convenience.
Does a chair truly exist in multiple locations? Or is it only our impression of a chair that persists?
(We say, ‘Yep, looks about right. That’s the chair.’, even though it isn’t the same thing)
Three objects (1,2,3) are located side by side. 2’s between 1 & 3. 2 is left of something, right of something, and neither to itself - simultaneously.
Directions are relative to a point of reference. This also applies to time.
‘Things’ exist over the span of dimensions. They have multiple points in space - an area.
There is an area of time which things exist, with each point able to compare to other points.
I think this is where the perceived issue lies.
We have shared series of memories currently, that corroborate each other.
From this we infer, that those memories are [semi-]accurate representations of our experience.
Those representations do not directly match our current experience of world - there are discrepancies.
We call these discrepancies ‘change’.
There are patterns we’ve recognized regarding how things change.
This gives us an impression of consistency and the capacity to predict anticipated changes.
We have memories regarding a series of corresponding events.
In each instance of memory, we also have memories nested within.
‘I remember remembering.’
The direction of our memories, relative to us, are always only one way.
From our the nested memories,
[and also our comparison of discrepancy],
we can order our memories.
We refer to these events as referencing ‘the past’.
We have many mechanisms by which
we can test / verify the accuracy,
of our representation of the past.
Which we do.
I think anything that ‘will’ exist, does exist already.
That these words we use, are very useful descriptions -
they hold utility, even if they do not accurately present reality as it is.
Time is a description of how we experience space - through deviation in comparison to memory.
How do we describe something has changed, if not by referencing a previous state?
Appearances and one’s feelings can mislead.