It's been four years, Guiyou month, Renshen day, and what year and which day was the Xinhai?

Gregorian calendar years 1869, 1929, and 1989 are the first and second years, and the period from white dew to cold dew. That is, Guiyouyue:

...

September 1974, white dew to October, cold dew

September p>1979, white dew to October, cold dew

September p>1984, white dew to October, cold dew

September p>1994, cold dew to October.