Is there a time difference in different parts of China?

Although Chinese mainland spans five time zones,

(1) Central time zone: the central longitude is 120 degrees.

(2) Longshu time zone: East longitude 105 degrees as the central meridian.

(3) New Tibet time zone: 90 degrees east longitude is the central meridian.

(4) Kunlun time zone: 75(82.5) degrees east longitude is the central meridian.

(5) Changbai time zone: the central longitude is 135( 127.5) degrees.

But administratively, Beijing time is used uniformly, 00:00 in Beijing and 00:00 in the whole country.

Longitude 15 degrees is a time zone, that is, the difference is one hour. China spans four time zones. Beijing is east longitude 120 degrees. China sets the standard time. If the local time of other provinces and cities is calculated according to the longitude difference, a longitude difference is 4 minutes.