Ding Youchun: It's March of Ding Younian. This method of dating is now common in calligraphy or inscriptions. The first is Ding You: the 34th year of the chronicle of agricultural history.
Ding You is one of the main branches, with a rank of thirty-four. The former is Bingshen, and the latter is the Reform Movement of 1898. On the theory of yin and yang and five elements, the heavenly stems belong to the fire of yin, and the earthly branches belong to the gold of yin, which means that fire and gold are alike.