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The traditional Chinese calendar (officially known as the Rural Calendar [農曆; 农历; Nónglì; "farming calendar"]), or Former Calendar (舊曆; 旧历; Jiùlì), Traditional Calendar (老曆; 老历; Lǎolì) or Lunar Calendar (陰曆; 阴历; Yīnlì; "yin calendar"), is a lunisolar calendar which reckons years, months and days according to astronomical phenomena. It is defined by GB/T 33661-2017, "Calculation and promulgation of the Chinese calendar", issued by the Standardisation Administration of China on 12 May 2017.
Although modern day China uses the Gregorian calendar, the traditional Chinese calendar governs holidays ...