Is it superstitious to choose the date of the calendar?

From a folklore point of view, not really. Everyone has such a program, which is auspicious.

Judging from the current empirical science, all this is unprovable, as if it were due to superstition. In fact, we can't rashly deny what we don't know and don't know.

The world we advocate at present is materialistic, and only what is visible and verifiable is scientific. This premise itself is unscientific.