Lao Huangli doesn't know who it is.

What you want to ask is what is an old calendar book? This is an almanac based on the lunar calendar in China.

Gregorian calendar is a paper publication, which can simultaneously display various calendars such as Gregorian calendar, lunar calendar and trunk calendar. Its main contents also include 24 solar terms, daily taboos, attaching importance to gods, stars, moon phases, and evil spirits. It is a unique historical and cultural phenomenon that the Chinese nation has inherited for more than 2,000 years.