Throughout its many years of history, various calendar systems have been used in Korea. Many of them were adopted from the lunar Chinese calendar system, with modifications occasionally made to accommodate Korea's geographic location and seasonal patterns.

The solar Gregorian calendar was adopted in 1896, by Gojong of Korea. Koreans now mostly use the Gregorian calendar; however, traditional holidays and age-reckoning for older generations are still based on the traditional lunisolar calendar.

During the early Goryeo period, the Tang-made Xuanming calendar (선명력; 宣明曆) was used until 1281. While the Tang revised the Xuanming calendar several times Korea insisted on using an unmodified version until Munjong's reign, when several improvised calendars, such as the Sipchŏng (십정력; 十精曆), Ch'iryo (칠요력; 七曜曆), Kyŏnhaeng (견행력; 見行曆), Tun'gap (둔갑력; 遁甲曆), and T'aeil (태일력; 太一曆) calendars were created.

In 1281 (the 7th year of Chungnyeol's reign) the Yuan-made Shòushí calendar (수시력; 授時曆) was adopted. However, Goryeo scholars tended to prefer the obsolete Xuanming calendar, which they were more accustomed to. During the late Goryeo period a revised version of Shòushí, known as the Taet'ong calendar (대통력; 大統曆) saw limited use.

Shòushí continued as the standard calendar until early Joseon when the Ch'ilchŏngsan (칠정산; 七政算) was created to serve as the first Korea-specialized calendar system during the reign of Sejong the Great. The Ch'ilchŏngsan consisted of two books, the Ch'ilchŏngsannaep'yŏn (칠정산내편; 七政算內篇) which detailed methods to accurately calculate dates and celestial movements regarding Korea's geographic location based on the Shòushí calendar, and the Ch'ilchŏngsanoep'yŏn (칠정산외편;七政算 外篇), which was based on the Huihui Lifa.

Beginning in 1644 (22nd year of Injo's reign), Korean scholars began discussing the adaptation of the Qing-made Shixian calendar (시헌력; 時憲暦; siheollyeok), as the limitations of the Ch'ilchŏngsan became clear. Although the Shixian calendar was officially adopted in 1653 (4th year of Hyojong's reign), it was not implemented in earnest until 1725 (1st year of Yeongjo's reign) as Korean scholars had little knowledge of western astronomy (which heavily influenced the Shixian calendar) and the Qing were reluctant to reveal any information of their new innovation.

The traditional calendar designated its years via Korean era names from 270 to 963, then Chinese era names with Korean era names at a few times until 1894.^{[citation needed]} In 1894 and 1895, the lunar calendar was used with years numbered from the foundation of the Joseon Dynasty in 1392.

The Gregorian calendar was adopted on 1 January 1896, with the Korean era name Geonyang (건양; 建陽; lit. 'adopting solar calendar').