player ever, male or female, to win five major championships and was ranked number 1 in the Women's World Golf Rankings for 109 consecutive weeks from 2011 to 2013. In tennis, Hsieh Su-wei is the country's most successful female tennis player. She reached a career-high singles ranking of world No. 23 in 2013 and world No. 1 in the doubles rankings in 2014. Calendar The standard Gregorian calendar is used for most purposes in Taiwan. The year is often denoted by the Minguo era system which starts in 1912, the year the ROC was founded. 2023 is year 112 Minguo (民國112年). The East Asian date format is used in Chinese. Prior to standardisation in 1929, the Chinese calendar was officially used. It is a Lunisolar calendar system which remains in use today for traditional festivals such as the Lunar New Year, the Lantern Festival, and the Dragon Boat Festival. See also Index of Taiwan-related articles Outline of Taiwan Notes Words in native languages References Citations Works cited Further reading Copper, John F. ed. Historical dictionary of Taiwan (1993) online Taeuber, Irene B. "Population Growth in a Chinese Microcosm: Taiwan." Population Index 27#2 (1961), pp. 101–126 online External links Overviews and data Taiwan. The World Factbook. Central Intelligence Agency. Taiwan from UCB Libraries GovPubs Taiwan country profile BBC News Background Note: Taiwan US Department of State Taiwan's 400 years of history New Taiwan, Ilha Formosa Key Development Forecasts for Taiwan from International Futures Chinese Taipei OECD Government agencies Office of the Government Office of the President Executive Yuan Judicial Yuan Control Yuan Examination Yuan Ministry of Foreign Affairs Republic of China (Taiwan) Embassies and Missions Abroad Taiwan, The Heart of Asia , Tourism Bureau, Republic of China (Taiwan) 1912 establishments in China Articles containing video clips Island countries Northeast Asian countries Chinese-speaking countries and territories States and territories established in 1912 Taiwan placenames originating from Formosan languages States with limited recognition Republics Former Japanese colonies Former member states of the United Nations