When is the day of yin and yang, when is the day of yin and yang?

Odd numbers are positive and even numbers are negative. You can do the math yourself.

Ten-day stems: A, B, D, E, G, F, N, G, N, G, 12 earthly branches: Zi Chou Mao Yinchen has been sixty years old in Xu Hai, Shen You. The most timely method is to combine ten-day stems with 12 earthly branches, with a total of 60 combinations. The first combination is Jiazi. Cycle every 60 years. Specific combinations: Jiazi, Picnic, Bingyin, ... Gui You, JOE, Yihai, Bingzi, ... that is, heavenly stems and earthly branches takes one stem or branch in their respective order to form a combination, totaling 60 species. The ancients defined odd-numbered days as yang and even-numbered days as yin. For example, this year is the year of Xu Bing and the year of Yang, because the sky is dry, Yin and Yang are fixed, and C is an odd number. Similarly, the ancients also used these 60 combinations to calculate the month, day and time. For example, a cloudy year, the moon is cloudy and the sun is cloudy, and there are many combinations. For example, in rainy years, the moon is cloudy and the sun is cloudy. The sun was between 3 o'clock in the afternoon of last August 1 Sunday 1. However, in the four pillars, that is, the eight characters, it is determined that the heavenly stem is Ding and it is Ding Wei. B, D and D are all dry on cloudy days, so the moon is cloudy and the day is cloudy.