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Time in China follows a single standard time offset of UTC+08:00, which is eight hours ahead of Greenwich Mean Time, despite that China spans five geographical time zones. The official national standard time is called ''Beijing Time'' () domestically and ''China Standard Time'' (CST) internationally. The special administrative regions maintain their own time authorities, the standards are called ''Hong Kong Time'' () and ''Macau Standard Time'' () respectively. There is no difference between Beijing time and the times in the SARs. In addition, Xinjiang unofficially uses time UTC+06:00 called ''Ürümqi Time'' (). ==History== (詳細はastrological predictions were conducted according to the time standard based on the locations of then capitals of the imperial dynasties. A summer time was observed in 1919 in Tianjin and Shanghai, and from 1935 to 1962 in parts of China. In 1918, the Central Observatory of the Republic of China in Peking (now Beijing Ancient Observatory) proposed to divide the country into five time zones, namely Kunlun (UTC+05:30), Sinkiang-Tibet (UTC+06:00), Kansu-Szechwan (UTC+07:00), Chungyuan (UTC+08:00), Changpai (UTC+08:30). These time zones were ratified in 1939 in the standard time conference of the Ministry of Interior of the Executive Yuan. After the Chinese Civil War in 1949, the People’s Republic of China abolished the five time zones system and established one single time zone (UTC+08:00) called ''Beijing Time'' or ''China Standard Time'' for the entire country. The unified time zone policy was adopted by the Communist Party of China or the Central People’s Government some time between 27 September 1949, and 6 October 1949; the exact date is unknown. However, recent research suggests that the policy was most likely adopted on 27 September 1949.〔Guo, Qingsheng (2003) "Beijing Time at the Beginning of PRC", ''China Historical Materials of Science and Technology'' 24(1)〕 Daylight saving time was observed from 1986 to 1991. In 1997 and 1999, Hong Kong and Macau were transferred to China from the United Kingdom and Portugal and they were established as special administrative regions. Although the sovereignty of the SARs belongs to China, historical reasons make them to retain their own policies regarding time zones. Due to their geographical locations, both are within the UTC+08:00 time zone, which is the same as the national standard — Beijing time. As an illustration of the wide range, the daylight hours for the Chinese westernmost, not including Xinjiang due to local customs (see below), and easternmost county seats are included:〔(【引用サイトリンク】NOAA Solar Calculator )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Time in China」の詳細全文を読む スポンサード リンク
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