According to the year Lord Yisi, Zhu Yue Dinghai and Japan Lord Xinji you provided, we can convert their corresponding heavenly stems and earthly branches into five elements. B corresponds to wood, D to fire, D to fire, Hai to water, Xin to gold, and already to soil.
According to the principle of the five elements, wood makes a fire, fire makes soil, soil makes gold, and gold makes water, aquatic wood. According to the principle of five elements, the tree makes a fire, the soil makes a fire, new gold is born in the water, and aquatic wood makes a fire. Therefore, the five elements of Nianzhu Yisi combination are fire soil.
Combining the moon column Ding Hai and the sun column Xin Ji, it can be concluded that their five-element combination is fire, water and gold. To sum up, the five elements of Nianzhu B belong to fire soil, the five elements of Moon Column Dinghai belong to fire water, and the five elements of Rizhu Xinji belong to gold soil.
This is a five-element combination calculated according to the five-element attribute of the ten-day stem and the twelve-day branch, which represents the five-element characteristics contained in the corresponding column position.