Which areas are using the lunar calendar?

Adjacent to China, it is used by several countries deeply influenced by China culture, mainly including Japan, North Korea, South Korea, Vietnam, Malaysia, Singapore, Mongolia and Myanmar. And several of these countries are for people's use only, and the government has almost abolished them. Vietnam is one of the few countries in the world that use the lunar calendar, and it is also one of the few countries that celebrate the Spring Festival all over the country. Koreans also celebrate the Lunar New Year, and August 15 and Dragon Boat Festival are Korean festivals. Vietnamese, like China people, are used to using the lunar calendar. There are also 24 solar terms and the Spring Festival, and the customs are very different from those in China.