|National Standard Time of Taiwan||03:23|
|Republic of China calendar|
|Literal meaning||Republic[an] year numbering system (Republic of China calendar)|
The Republic of China calendar(中華民國曆) or Minguo calendar(民國紀年) is one of the calendars used in Greater China area. The calendar is to commemorate 1912, the year of the establishment of the Republic of China, the first republic of the Chinese history. The term 'minguo' simply means the Republic (traditional Chinese: 民國; simplified Chinese: 民国; pinyin: Minguo; literally: 'People's State'). ROC calendar follows the tradition of using the sovereign's era name and year of reign, as previous imperial dynasties have done. Months and days are numbered according to the Gregorian calendar. ROC calendar has been widely used in the early official documents of the ROC since 1912. .
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The Gregorian calendar was adopted by the nascent Republic of China effective 1 January 1912 for official business, but the general populace continued to use the traditional Chinese calendar. The status of the Gregorian calendar was unclear between 1916 and 1921 while China was controlled by several competing warlords each supported by foreign colonial powers. From about 1921 until 1928 warlords continued to fight over northern China, but the Kuomintang or Nationalist government controlled southern China and used the Gregorian calendar. After the Kuomintang reconstituted the Republic of China on 10 October 1928, the Gregorian calendar was officially adopted, effective 1 January 1929. The People's Republic of China has continued to use the Gregorian calendar since 1949.
Despite the adoption of the Gregorian calendar, the numbering of the years was still an issue. The Chinese imperial tradition was to use the emperor's era name and year of reign. One alternative to this approach was to use the reign of the half-historical, half-legendary Yellow Emperor in the third millennium BC to number the years. In the early 20th century, some Chinese Republicans began to advocate such a system of continuously numbered years, so that year markings would be independent of the Emperor's regnal name. (This was part of their attempt to de-legitimize the Qing Dynasty.)
When Sun Yat-sen became the provisional president of the Republic of China, he sent telegrams to leaders of all provinces and announced the 13th day of 11th Month of the 4609th year of the Yellow Emperor's reign (corresponding to 1 January 1912) to be the first year of the Republic of China. The original intention of the Minguo calendar was to follow the imperial practice of naming the years according to the number of years the Emperor had reigned, which was a universally recognizable event in China. Following the establishment of the Republic, hence the lack of an Emperor, it was then decided to use the year of the establishment of the current regime. This reduced the issue of frequent change in the calendar, as no Emperor ruled more than 61 years in Chinese history — the longest being the Kangxi Emperor, who ruled from 1662–1722 (Kangxi 61). (Qianlong Emperor abdicated in 1795, i.e. Qianlong 60, but the reign name of Qianlong is still used unofficially until his death in 1799 i.e. Qianlong 64.)
As Chinese era names are traditionally two characters long, 民國 (Mínguó, "Republic") is employed as an abbreviation of 中華民國 (Zhōnghuá Mínguó, "Republic of China"). The first year, 1912, is called 民國元年 (Mínguó Yuánnián) and 2020, the "109th year of the Republic" is 民國九十九年, 民國109年, or simply 109.
Based on National Standards of the Republic of China CNS 7648: Data Elements and Interchange Formats—Information Interchange—Representation of Dates and Times (similar to ISO 8601), year numbering may use the Gregorian system as well as the ROC era. For example, 18 February 2020 may be written 2020-02-18 or ROC 109-02-18.
The ROC era numbering happens to be the same as the numbering used by the Juche calendar of North Korea, because its founder, Kim Il-sung, was born in 1912. The years in Japan's Taishō period (30 July 1912 to 25 December 1926) also coincide with those of the ROC era.
In addition to the ROC's Minguo calendar, Taiwanese continue to use the lunar Chinese calendar for certain functions such as the dates of many holidays, the calculation of people's ages, and religious functions.
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The use of the ROC era system extends beyond official documents. Misinterpretation is more likely in the cases when the prefix (ROC or 民國) is omitted.
To convert any Gregorian calendar year (1912 and after) to ROC calendar, subtract 1911.