In which dynasty did the earliest calendar in China appear?

The earliest calendar is Xia Li, which is said to belong to Xia Dynasty.

The summer calendar is one of the traditional calendars in China, also known as lunar calendar, lunar calendar, lunar calendar, ancient calendar and old calendar. Belongs to a kind of lunar calendar, the average calendar month is equal to a new moon, which is the same as the lunar calendar principle, so it has the composition of lunar calendar; On the other hand, the leap month is set to make the average calendar year the tropic year, and 24 solar terms are set to reflect the changing characteristics of the seasons (the annual movement of the direct point of the sun), so there is also a solar calendar. Today, almost all Chinese in the world, as well as South Korea, Vietnam and other countries still use the summer calendar to calculate traditional festivals such as Spring Festival, Mid-Autumn Festival and Dragon Boat Festival.