Is the lunar calendar unique to China or is it different in every country? Is the new calendar unified all over the world?

Specifically, only the Han people have different calendars in the lunar calendar. For example, the Mayan solar calendar has 13 months a year, 20 days a month and 260 days a year! !

The new calendar you mentioned is the solar calendar, which belongs to western countries. Now every country has this kind of calendar. But when offering sacrifices, they are counted according to their own country's history.