An ultimate extreme level of a moment in time, which is nothing but 'Nothing' or Nothingness! That is, "Nothing" is regarded as the true smallest unit of time. And also the most fundamental building block of the universe.

Time is the ultimate reality.

Nothing" or Nothingness is the ultimate fundamental force of nature.

In my view, an ultimate extreme level of a moment in time is nothing but actual "Nothing" or nothingness. Again, in my view, a moment in time is past, present, and future at the same moment in time. The present is an illusion. Our present is our past and the future.

An ultimate extreme level of a moment in time is nothing but "Nothing" or Nothingness. The opposite of time is not Nothing, it's another time. Nothing is not the opposite of something, but a part of it. And, Nothing is not the opposite of time, but a part of it. That is, Time existed before Big Bang. There was absolute "Time" before the Big Bang.

An ultimate extreme level of a moment in time, which is nothing but 'Nothing' or Nothingness! That is, "Nothing" is actually the real smallest unit of time! And also the most fundamental building block of the universe. In this regard, "Nothing" is regarded as the true opposite of time.

The ultimate extreme level of a moment in time is the singularity of a black hole.