What is the date of the ancient year?

Branch and branch chronology. Such as "Five Tombstones": "In memory of the arrest of Duke Zhou, I hope Ding Mao will be in March." "Ding Mao" refers to AD1627; The preface to the story of the seventy-two martyrs in Huanghuagang: "The worst death was the siege of Guangdong and Guangxi on March 29th,191." Xinhai refers to the year1911; "Letter to Wife" "Xin Wei reads six nights and four drums in March" and "Xin Wei" should be Xinhai. In modern times, chronicles of cadres and branches are often used to represent major historical events, such as the Sino-Japanese Sino-Japanese War of 1894-1895, the Reform Movement of 1898, the boxer indemnity, the Sino-Japanese Treaty and the Revolution of 1911. The methods of ancient calendar year, month and day: ① Ancient calendars: there are official calendars, emperor calendar, vassal calendar and annual calendar. (2) Ancient lunar calendar method: the earth branch records the main lunar calendar. (3) Ancient calendar: a calendar with branches. Ten days of work: A, B, C, D, E, G, Xin, Ren, Gui, twelve branches: Zi Chou Mao Yinchen didn't apply at noon.