Two months after publishing this, with more time to think it through, I believe this was not a direct fear of time as much as it is the fear of running out of time from not integrating into society as an autistic. The passage of time is a factor. And, for me, my birthday is rather close to the new year as well (October).
The longer time passed that I did not integrate, the worst my mental health became and the easier to recognize the chronophobia it became as well.

There could be any number of facets of this issue. While memory retention is sometimes a strength for autistic people, that may be because trauma is involved with much of the stuff. Not integrating, unemployment, bullying, suicide, long-term depression, constant masking, and late diagnosis.

Your inability to recall biographical memories could be a sign of something related to this theory. There really is a comprehension barrier for a lot of the autistic experience. It took me a year after realizing autism was a major influence on my life to realize I was still in denial of my late diagnosis.

It took a conscious effort to cope with it and just as much luck to realize I was in denial to begin with. Take it slow. Reread information like my theory. Asking questions. Self-reflection. Comparing with other autistic people. In any case, time is a factor in all our lives.

For autistic people who are not integrating socially, economically, or both at once, as poet Delmore Schwartz said, “Time is the fire in which we burn.” We feel it..