The use of 阳历 in China is a story of modernization and cultural fusion. While the West primarily uses one calendar, modern Chinese life runs on a dual-calendar system. Historically, China exclusively used the lunar calendar, known as 农历 (nónglì), the “agricultural calendar,” or 阴历 (yīnlì), the “lunar calendar.” This calendar governs traditional holidays that are central to Chinese culture, such as the Spring Festival (Chinese New Year) and the Mid-Autumn Festival. The 阳历 (Gregorian calendar) was officially adopted by China in 1912 after the fall of the last dynasty, as a step toward modernizing and aligning the nation with international standards. Today, the 阳历 is the official calendar for everything public and civic. Your official ID card birthday, school semesters, national holidays like National Day (October 1st), and business contracts all use the 阳历. The best comparison in Western culture isn't a calendar, but perhaps the coexistence of the metric and imperial systems in countries like the UK. One system (metric/阳历) is used for official and international purposes, while the other (imperial/农历) persists in certain cultural or traditional contexts. For Chinese people, navigating these two calendars is a normal part of life.
In daily conversation, 阳历 is the assumed standard unless a traditional context is implied.