1. It changed in the period of Wang Mang.
Quote the following passage:
At the beginning of the Western Han Dynasty, Qin Li's style was still used, but it began to change greatly in the Xin Mang period, resulting in the writing method of stippling. By the Eastern Han Dynasty, Lishu had produced many styles and left a large number of stone carvings. Zhang Qianbei and Cao Quanbei are the representative works of this period.
Follwed reorganization time:
Wang Mang took advantage of the influence of his consorts and ascended the throne of the emperor in 8 AD. According to the principle of "more orderly", he changed the name of the country to "new". In order to alleviate the sharp class contradictions at that time, a large-scale reform was carried out in the second year, which was called "entrust an orphan to reform the system" in history.
Wang Mang has been in office for only forty years.
Therefore, I can only be accurate to between AD 8 and AD 48, most likely the year when Wang Mang was restructured, that is, AD 9.
It was changed during the reign of Emperor Wu of the Han Dynasty.
As soon as Emperor Wu ascended the throne, he was unified on the basis of Wang Mang's period. The year after 65438 BC is estimated to be 14 1.