What is time?

The Time keeps changing,
Despite the clock constant circling.
The numbers aren't changing,
but memories keeps on fading.

As we grow and continue aging,
Time became something.
Something like nothing,
This nothing is also the beginning.

Begining that seems to never end.
Time seem to exist, and couldn't bend.
Even theories about it will fade,
But time remains the same.

History may or may not repeat itself.
Time may starts from 1 down to 12.
The cycle of time never end
But those who care...