The origin of yin and yang eyes? Is it related to the date of birth? How to calculate the date of birth?

As far as I know, there are some special birthdays, where paranormal phenomena will occur and things that ordinary people can't see will be seen. If you are interested in this aspect, I recommend you to read The Eight-character Truth Strategy Revelation by Mr. Song Yingcheng, a master of eight-character numerology in Taiwan Province Province. He said in the book that those eight characters will have supernatural eyes.