The Republic of China calendar (traditional Chinese: 民國紀元; simplified Chinese: 民国纪元; pinyin: Mínguó Jìyuán; Wade–Giles: Min2-kuo2 Chi4-yüan2) is the method of numbering years currently used in Taiwan and other territories under the control of the Republic of China. It was used in mainland China from 1912 until the founding of the People's Republic of China in 1949.