Civil calendar

[1] The civil calendar is almost always used for general purposes by people and private organizations.

Although that calendar was first declared by Pope Gregory XIII to be used in Catholic countries in 1582, it has since been adopted, as a matter of convenience, by many secular and non-Christian countries although some countries use other calendars.

Four countries have not adopted the Gregorian calendar: Afghanistan and Iran (which use the Solar Hijri calendar), Ethiopia (the Ethiopian calendar), and Nepal (Vikram Samvat and Nepal Sambat).

In the former two countries, the Anno Domini era is also in use.

South Korea previously used the Korean calendar from 1945 to 1961.