【When did the mainland start using the Gregorian calendar】
The Common Era, the Common Era calendar, which is now common in the world, was actually introduced to China as early as the Ming Dynasty, but it was not used. Until January 1, 1912, Sun Yat-sen was sworn in as provisional president in Nanjing, proclaiming the establishment of the Provisional Government of the Republic of China, and at the same time issuing the "Declaration of the Provisional President", the end of the declaration was signed as "New Year's Day of the First Year of the Republic of China", which was the first use of the Gregorian calendar in official proclamations, and the first time that the term "New Year's Day", which originally referred to the New Year's Day of the Lunar New Year, was assigned to the Gregorian calendar. Sun Yat-sen then ordered that in order to "follow the Xia Zheng, so follow the peasant time; from the Western calendar, so the statistics are counted", the Gregorian calendar is used instead. Although the official announcement has been made to switch to the Gregorian calendar, the lunar calendar, which has been used for thousands of years, is still used in the folk.
