All of China runs on one clock — China Standard Time, UTC+08:00, with no daylight saving — even though its eastern and western edges are more than two hours apart in real solar time.
That single offset is the whole answer, but it leaves two fair follow-up questions: what the time zone database actually records for China, and what a shared clock does to a working day three thousand kilometres from Beijing.
The official position
China keeps one national offset. UTC+08:00 applies from the Pacific coast to the far west, it is called Beijing Time in Chinese usage and China Standard Time in English, and no part of the country moves its clocks in summer.
The IANA time zone database — the reference that phones, servers and booking systems read their offsets from — lists two zones under the country code CN:
| IANA zone | Name in the database | UTC offset |
|---|---|---|
| Asia/Shanghai | Beijing Time | UTC+08:00 |
| Asia/Urumqi | Xinjiang Time | UTC+06:00 |
Asia/Shanghai is the official nationwide clock, and it is the zone behind both the Beijing clock and the Shanghai clock on this site. Asia/Urumqi exists because an unofficial second reckoning, two hours behind Beijing Time, is in everyday use in Xinjiang in China's far west; the database's own notes call it "Xinjiang time, used by many in western China".
The same database dates the nationwide arrangement precisely: the Asia/Shanghai record switches to country-wide rules on 28 May 1949.
What one offset does to the day: a worked example
UTC+08:00 is built around the 120°E meridian, where the sun is overhead at roughly 12:00 on the clock. Every degree of longitude away from that line is worth four minutes of solar time:
solar noon ≈ 12:00 + (120° − longitude) × 4 minutes
Shanghai sits at 121°28′E, the coordinate the database records for Asia/Shanghai. That is 1.47° east of the meridian:
(120 − 121.47) × 4 = −5.9 minutes, so solar noon falls at about 11:54.
Urumqi sits at 87°35′E, the coordinate recorded for Asia/Urumqi. That is 32.42° west of the meridian:
(120 − 87.58) × 4 = +129.7 minutes, or 2 hours 10 minutes, so solar noon falls at about 14:10.
Same country, same clock reading, and a gap of two hours and sixteen minutes in where the sun actually is. That is the practical reason the unofficial Xinjiang reckoning survives: measured on Beijing Time, a winter morning in the far west starts long after what most people would call morning.
Daylight saving: tried, then dropped
China does not observe daylight saving time, and has not done so since 1991.
The time zone database records a six-year experiment rather than a permanent rule. Clocks went forward on 4 May 1986, and then in mid-April in each of the years 1987 to 1991, going back in mid-September each autumn. The change in 1991 was the last one, and no daylight-saving rule has applied in China since. Both the Beijing and Shanghai clocks on this site therefore read "daylight saving time: not in effect" on every day of the year.
What that means when you are scheduling
A country with one fixed offset and no seasonal change is unusually easy to plan around, with one catch: the gap between you and China moves when your clock changes, not when China's does.
Sydney is the clearest illustration. It is currently on Australian Eastern Daylight Time, UTC+11:00, which puts it three hours ahead of Beijing. Its next changeover is 4 April 2027, when it returns to UTC+10:00 — and from that morning the gap to China is two hours, without anything in China having moved.
If you need the gap between two specific cities on a specific date, the time zone converter works it out against both cities' current rules rather than against a remembered offset.
The short version
- China has one official time zone: China Standard Time, UTC+08:00.
- The IANA database lists two zones for the country — Asia/Shanghai at UTC+08:00 and Asia/Urumqi at UTC+06:00, the second reflecting unofficial local use in Xinjiang.
- There is no daylight saving anywhere in China; the last clock change was in 1991.
- Solar noon on the national clock ranges from roughly 11:54 in Shanghai to roughly 14:10 in Urumqi.