Beijing time is the standard time for China to adopt Dongba time zone as the international time zone.
Beijing time is not Beijing local time (1 16.4 E), but the local time of East Eighth District (120 E), so the local time of East 120 E is about14.30 minutes earlier than Beijing local time. Beijing is named "Beijing time" because it is located in the East Eighth District of the international time zone, which is 8 hours different from Greenwich Mean Time (UTC) (that is, Beijing time = UTC +8 hours).
Extended data:
The historical development of Beijing time;
In the 28th year of Guangxu reign in Qing Dynasty (A.D. 1902), when China Customs established the coast, the time of east longitude 120 degrees was taken as the standard. 19 12 years, the central observatory in Beijing divided the whole country into five time zones. On March 9, 2008 (1939), the Ministry of the Interior of the Republic of China held a standard time meeting and decided that the time zone divided by 19 12 was the standard time zone of the Republic of China. They are:
Kunlun Time Zone GMT+5.5 Western Xinjiang and parts of Tibet
New Tibet Time Zone GMT+6 Xinjiang and Tibet
Longshu Time Zone GMT+7 Central China
Central Plains Standard Time Zone GMT+8 China Coast
Changbai Time Zone GMT+8.5 Northeast China
After 1949, China changed the name of "Central Plains Standard Time" to "Beijing Time" and used it as standard time in the whole country (mainland, Hong Kong, Macao and Taiwan provinces). Beijing time is measured and broadcast in Xi 'an, but Xi 'an time does not represent the national standard time. Xi 'an is located in Dong Qi time zone, and its geographical longitude is east longitude108 56'.
References:
Baidu Encyclopedia-Beijing Time