Excuse me, when is Guan Gong good?

Choosing the first day and the fifteenth day is the best.

Who is Guan Gong:

Guan Yu has a long cloud (unknown date of birth? -220 years) This word means longevity or longevity, and later it was changed to Yunchang, a native of Xie Liang (now Yuncheng, Shanxi). China, a famous soldier in the last years of the Eastern Han Dynasty, has been following Liu Bei since he assembled his troops in the village. He is one of the most trusted generals of Liu Bei. After Guan Yu's death, his image was gradually deified by later generations, and he has always been the object of folk sacrifice and was honored as "Guan Gong". Praised and sealed by the court. In the Qing Dynasty, it was regarded as "the spirit of loyalty and righteousness in SHEN WOO, showing great sage in benevolence, righteousness and bravery" and was honored as "warrior sage", just like Confucius in Wen Sheng. Guan Yu's deeds are also described in the novel Romance of the Three Kingdoms, in which Guan Yu is described as the first of the "Five Tiger Generals" and Mao Zonggang called it "one of the three wonders of Romance". In addition, there was a place called Guan Yu in ancient times, and its exact location is unknown.