Hong Kong is UTC+8, permanently
No daylight saving. No seasonal clock shifts. The offset has been fixed since 1979, when Hong Kong abandoned its last DST experiment. The Hong Kong Observatory maintains the standard via caesium atomic clock and disseminates it through NTP servers and a telephone talking clock (dial 18503; confirm the number is still active with the Observatory).
That puts Hong Kong in the densest business corridor on the continent.
UTC+8: the East Asian business corridor
The UTC+8 band is the core working-hours zone for East and Southeast Asia. Cities that share Hong Kong’s offset year-round:
| City | IANA zone | DST? |
|---|---|---|
| Hong Kong | Asia/Hong_Kong | No |
| Beijing / Shanghai | Asia/Shanghai | No |
| Singapore | Asia/Singapore | No |
| Kuala Lumpur | Asia/Kuala_Lumpur | No |
| Manila | Asia/Manila | No |
| Perth (Australia) | Australia/Perth | No |
| Makassar (Indonesia) | Asia/Makassar | No |
Every city in this table keeps UTC+8 all year. A 09:00 meeting in Hong Kong is a 09:00 meeting in Singapore, Manila and Shanghai.
Hong Kong’s neighbours: same zone and +1 zones
The two most common confusion points for people scheduling across Asia are Tokyo and Bangkok.
Same zone (UTC+8): China, Singapore, Malaysia, Philippines, Western Australia, central Indonesia. You dial the same time.
One hour ahead (UTC+9): Tokyo and Seoul. Japan Standard Time and Korea Standard Time are both UTC+9 with no DST. When it is 12:00 in Hong Kong, it is 13:00 in Tokyo and Seoul. The difference never changes.
One hour behind (UTC+7): Bangkok, Hanoi, Jakarta, Vientiane. When it is 12:00 in Hong Kong, it is 11:00 in Bangkok or Hanoi.
Two and a half hours behind (UTC+5:30): Mumbai, Delhi, Colombo. Hong Kong is 2.5 hours ahead of India Standard Time, every day of the year.
The China puzzle: one country, one offset
China spans five geographical time zones. Beijing mandates a single official time: China Standard Time (UTC+8) everywhere.
In Kashgar and Ürümqi, local businesses sometimes operate on an unofficial “Xinjiang Time” (UTC+6), but official schedules, trains, flights and government offices follow Beijing time. Hong Kong uses the same offset but keeps its own IANA zone (Asia/Hong_Kong, not Asia/Shanghai). The separation is historical and administrative: Hong Kong’s time standard is governed under its own Weights and Measures Ordinance, with the Observatory as legal timekeeper.
For practical scheduling, Hong Kong and all of mainland China share the same clock.
ASEAN time zones: from UTC+6:30 to UTC+9
Southeast Asia is not a single block. The spread:
- UTC+6:30: Myanmar (no DST)
- UTC+7: Thailand, Vietnam, Cambodia, Laos, western Indonesia (Jakarta)
- UTC+8: Singapore, Malaysia, Philippines, central Indonesia (Makassar), Brunei
- UTC+9: Eastern Indonesia (Jayapura)
Myanmar is the odd one out: 1.5 hours behind Hong Kong. The rest align on the hour.
How Asia’s lack of DST simplifies scheduling
Most of East and Southeast Asia does not observe daylight saving time. The exceptions are regional: parts of Mongolia, and Middle Eastern countries that use DST (Iran, Israel, Jordan, Lebanon). For the corridor from Bangkok to Tokyo, the time difference with Hong Kong is fixed.
This means:
- Hong Kong to Singapore: always 0 hours.
- Hong Kong to Tokyo: always +1 hour.
- Hong Kong to Bangkok: always -1 hour.
- Hong Kong to London: 7 hours in July, 8 hours in January (the change is entirely on London’s side).
- Hong Kong to New York: 12 hours in July, 13 hours in January (the change is entirely on New York’s side).
You never need to check “did the clocks change” for your Hong Kong, Tokyo or Hong Kong, Singapore call. The offset is permanent.
Who should do something different: If you are scheduling between Hong Kong and Myanmar, do not assume a round hour. Myanmar is UTC+6:30, so a 10:00 meeting in Hong Kong is 08:30 in Yangon. Set your calendar to the half-hour.