1, Beijing time is taken from the East Eighth Time Zone of the International Time Zone, and China is a vast country, spanning five time zones from west to east. After the founding of the People's Republic of China, Dongba District, where the capital Beijing is located, was adopted as the standard time, which was called "Beijing time".

2. Beijing time is not the local time in Beijing (east longitude116.4), but the local time in east longitude 120, so the local time in east longitude120 is about 14 and a half minutes earlier than the local time in Beijing. Beijing is named "Beijing time" because it is located in the East Eighth District in the international time zone, which is 8 hours different from Greenwich Mean Time (UTC) (that is, Beijing time = UTC +8 hours). The East Eighth District includes an area with the east longitude112.5 to east longitude127.5, with the east longitude120 as the central line, extending 7.5 from east to west, with a total width of15.