China to HST
-18hChina
CSTSOURCEHST
HSTGreen rows indicate typical business hours (9 AM - 5 PM)
CST and HST on the World Map
The map below highlights the CST (China Standard Time) and HST (Hawaii Standard Time) timezone regions across the globe.
CST – China Standard Time
UTC+08:00China Standard Time (CST) covers all of mainland China, 8 hours ahead of UTC.
- •China uses a single time zone despite spanning 5 geographical zones.
- •In Xinjiang (western China), sunset can be as late as midnight in summer.
- •China abolished daylight saving time in 1991.
- •The Shanghai Stock Exchange operates on CST/Beijing Time.
HST – Hawaii Standard Time
UTC-10:00Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.
- •Hawaii does not observe daylight saving time.
- •HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
- •Hawaii is one of only two US states that don't observe DST (the other is Arizona).
Understanding the -18h Gap: China vs HST
China runs on China Standard Time (CST) at UTC+08:00. HST runs on Hawaii Standard Time (HST) at UTC-10:00. That puts China 18 hours behind HST — a difference of -18h at the current offsets.
In practice, when it is 9:00 AM in China it is 3:00 PM in HST on the previous day. Midnight in China is 6:00 AM in HST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
China to HST time conversion table
| China (CST) | HST (HST) | Day |
|---|---|---|
| 12:00 AM | 6:00 AM | previous day |
| 6:00 AM | 12:00 PM | previous day |
| 7:00 AM | 1:00 PM | previous day |
| 8:00 AM | 2:00 PM | previous day |
| 9:00 AM | 3:00 PM | previous day |
| 12:00 PM | 6:00 PM | previous day |
| 3:00 PM | 9:00 PM | previous day |
| 5:00 PM | 11:00 PM | previous day |
| 6:00 PM | 12:00 AM | same day |
| 9:00 PM | 3:00 AM | same day |
Why people convert China to HST time
- Scheduling a call from China to HST: a 10:00 AM start in China lands at 4:00 PM in HST the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -18h gap: China and HST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in HST is 3:00 PM in China.
- Keeping family and friends in sync: knowing that 8:00 PM in China is 2:00 AM in HST makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM CST" is unambiguous; "3 PM" across a -18h gap is not.
- With a -18h gap there is no shared 9-to-5 window, so alternate the early start: one week China takes the early slot, the next week HST does.
About CST (China Standard Time)
China Standard Time (CST, also known as Beijing Time) is used across all of mainland China despite the country spanning five geographical time zones. This single-timezone policy was adopted in 1949. China does not observe daylight saving time. CST is shared with Hong Kong (HKT), Macau, Taiwan, Singapore, Malaysia, and the Philippines, making UTC+08:00 one of the most used offsets in the world.
About HST (Hawaii Standard Time)
Hawaii Standard Time (HST) is used in the state of Hawaii and does not observe daylight saving time. This makes HST one of the most consistent time zones in the US. The Hawaiian Islands are among the last places on Earth to see a new calendar day.
Best time to call between China and HST
With a -18h offset there is no overlap inside a normal 9 AM – 5 PM day. HST opens at 9:00 AM HST, which is 3:00 PM in China, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
China and HST have no shared working hours because of the -18h gap. Teams need to alternate early starts or rely on asynchronous handovers.
China is 18 hours behind HST (CST UTC+08:00 → HST UTC-10:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between China and HST?
China (CST, UTC+08:00) is 18 hours behind HST (HST, UTC-10:00). The gap is currently -18h.
How do I convert China time to HST time?
Add -18h to China local time. For example, 9:00 AM in China is 3:00 PM in HST (previous day).
What time is it in HST right now?
HST uses HST at UTC-10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -18h offset from China.
What is the best time to call HST from China?
There is no shared working-hours window because of the -18h gap. The closest option is 1:00 PM in China, which is 7:00 PM in HST.
Which is behind, China or HST?
China is 18 hours behind HST. When it is 12:00 PM in China it is 6:00 PM in HST.
Do China and HST use different time zones?
China (China) uses CST at UTC+08:00, while HST uses HST at UTC-10:00. The IANA identifiers are Asia/Shanghai and Pacific/Honolulu.
Does daylight saving time affect the China–HST difference?
Neither zone observes daylight saving time, so the -18h offset between China and HST is fixed all year.
Which other cities share China's time zone?
CST also covers Shanghai, Beijing, Shenzhen, Guangzhou, Chengdu, Hong Kong, Taipei, Wuhan and 2 more.
Which countries use CST, China's zone?
CST is used in China, Hong Kong, Macau, Taiwan.
Is there a day difference between China and HST?
Sometimes. The -18h gap is large enough that 8:00 PM or later in China already falls on the in HST.
What is the time difference between China and HST?
HST is -18h from China.
What timezone is China in?
China operates on its local timezone.
What timezone is HST in?
HST operates on its local timezone.
Which countries use CST (China Standard Time)?
CST is used in China, Hong Kong, Macau, Taiwan.
Does CST observe daylight saving time?
No, CST does not observe daylight saving time and remains at UTC+08:00 year-round.
What are some interesting facts about CST?
China uses a single time zone despite spanning 5 geographical zones. In Xinjiang (western China), sunset can be as late as midnight in summer.
Which cities are in the HST timezone?
Major cities in the HST timezone include Honolulu, Hilo, Kailua, Pearl City, Kapolei.
What is the UTC offset for HST?
Hawaii Standard Time (HST) is at UTC-10:00.
What should I know about the HST timezone?
Hawaii does not observe daylight saving time. HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
When is it midnight in China, what time is it in HST?
When it is 12:00 AM (midnight) in China (CST), it is -18h later in HST (HST).
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