What does horse day mean in the yellow calendar?

Horse day is the date code in the yellow calendar. After the establishment of modern posts and telecommunications in China, the date of telegraph and time-telling was replaced by the rhyme of ancient China. 2 1 is called "horse day". After the establishment of the post and telecommunications industry, the date of sending electricity and telling the time was replaced by the ancient Chinese rhyme. For example, 1 is called "East Day", 2 is called "Winter Day", 3 is called "Jiangri" ... 2 1 is called "Horse Day".

The Qing government opened the telegraph in the fifth year of Guangxu (1879), and after the Qing court opened the telegraph, it invented a new method to record the date, using rhymes instead of dates. This method has been used in the field of telecommunications until the early days of People's Republic of China (PRC), and has been used for more than 70 years. At its most popular time, some officials of the Qing government often used rhymes instead of dates in their notes. Words such as "Yan Dian", "Hao Dian", "Jia Dian" and "Qi Dian" that often appear in modern history books such as The History of the Communist Party of China are the so-called "replacing the day with rhyme", that is, the rhymes that replace the date are selected from the rhyme table, totaling 3 1 piece, representing 3l days respectively.