What is China Standard Time?
China Standard Time (CST), also called Beijing Time, is the official time used across all of mainland China. Despite China's vast geographic width, the entire country observes a single time zone set at UTC+8, and it does not use daylight saving time. This makes converting from Coordinated Universal Time (UTC) to China time straightforward and consistent all year round.
How to use this converter
Enter the UTC hour (0–23) and minute (0–59), then read the converted China Standard Time below. The tool adds 8 hours and wraps the value onto a 24-hour clock. If adding 8 hours pushes the time past midnight, the result shows a "next day" indicator so you know the date has advanced.
The formula explained
The core conversion is simply CST = UTC + 8 hours. Because hours run from 0 to 23, we apply a modulo-24 operation: \(H_{\text{CST}} = (H_{\text{UTC}} + 8) \bmod 24\). When the original UTC hour is 16 or later, the sum reaches 24 or more, so the clock rolls over to the following day.
$$T_{\text{CST}} = \left(\text{UTC Hour} \times 60 + \text{UTC Minute} + 480\right) \bmod 1440$$$$\text{where}\quad \left\{ \begin{aligned} \text{CST Hour} &= \left\lfloor \frac{T_{\text{CST}}}{60} \right\rfloor \\ \text{CST Minute} &= T_{\text{CST}} \bmod 60 \end{aligned} \right.$$
Worked example
Suppose an online meeting is scheduled for 09:30 UTC. Adding 8 hours gives 17:30, which stays within the same day. So the meeting is at 17:30 China Standard Time. Now take 20:00 UTC: \(20 + 8 = 28\), and \(28 \bmod 24 = 4\), so it becomes 04:00 CST the next day.
FAQ
Does China use daylight saving time? No. China abolished daylight saving time in 1991, so the UTC+8 offset is fixed throughout the year.
Is China Standard Time the same as Beijing Time? Yes. CST and Beijing Time both refer to UTC+8 across the whole country.
What does "next day" mean in the result? If adding 8 hours moves the time past 23:59 UTC, the China-side clock advances to the following calendar day, which the tool flags for you.
