I have wondered in the past if "time" has varied over the existence of the Universe, like if the first 100,000,000 years relative to our own reckoning was actually more like 100 billion years as time is elastic and changed over some other higher-dimensional axis. Just a musing by a speculator

How was time created, time means changing state, without time there is no change. So in order for a change to happen in the existence of time you'd need a further time dimension; then you're just shifting the problem up the stack.

Creation of time requires a meta-universe of some sort. Though perhaps there's some other way to conceive time not existing further back than a given point that works around creation being something that's done within a temporal dimension.

Although in that case, barring any meta-universe to provide a defintion of time beyond time, time must simply be.

Or not be, but I think we can rule that one out.

It is no different from the question how any other dimension suddenly existed. Time and space are connected.