HKT to JST
+1hHKT
HKTSOURCEJST
JSTGreen rows indicate typical business hours (9 AM - 5 PM)
HKT and JST on the World Map
The map below highlights the HKT (Hong Kong Time) and JST (Japan Standard Time) timezone regions across the globe.
HKT – Hong Kong Time
UTC+08:00Hong Kong Time (HKT, UTC+08:00) is the time zone for Hong Kong, 8 hours ahead of UTC.
- •Hong Kong does not observe daylight saving time and has kept UTC+08:00 since 1979.
- •HKT shares its offset with China Standard Time, Singapore Time and Philippine Time.
- •The Hong Kong Stock Exchange opens at 09:30 HKT.
- •Hong Kong Time does not change with the seasons, so its gap to other zones is fixed.
JST – Japan Standard Time
UTC+09:00Japan Standard Time (JST) is the time zone for Japan, 9 hours ahead of UTC.
- •Japan does not observe daylight saving time.
- •Tokyo is the most populous metropolitan area in the world.
- •The Tokyo Stock Exchange operates from 9:00 AM to 3:00 PM JST.
- •JST is 14 hours ahead of EST and 9 hours ahead of GMT.
HKT vs JST: Offsets, DST and Best Call Times
HKT runs on Hong Kong Time (HKT) at UTC+08:00. JST runs on Japan Standard Time (JST) at UTC+09:00. That puts HKT 1 hour ahead of JST — a difference of +1h at the current offsets.
In practice, when it is 9:00 AM in HKT it is 10:00 AM in JST. Midnight in HKT is 1:00 AM in JST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
HKT to JST time conversion table
| HKT (HKT) | JST (JST) | Day |
|---|---|---|
| 12:00 AM | 1:00 AM | same day |
| 6:00 AM | 7:00 AM | same day |
| 7:00 AM | 8:00 AM | same day |
| 8:00 AM | 9:00 AM | same day |
| 9:00 AM | 10:00 AM | same day |
| 12:00 PM | 1:00 PM | same day |
| 3:00 PM | 4:00 PM | same day |
| 5:00 PM | 6:00 PM | same day |
| 6:00 PM | 7:00 PM | same day |
| 9:00 PM | 10:00 PM | same day |
Why people convert HKT to JST time
- Scheduling a call from HKT to JST: a 10:00 AM start in HKT lands at 11:00 AM in JST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both HKT and JST are inside the 9-to-5 working day between 9:00 AM and 4:00 PM HKT time (10:00 AM–5:00 PM JST). That is roughly 7 hours of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in HKT is 9:00 PM in JST makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM HKT" is unambiguous; "3 PM" across a +1h gap is not.
- Block 9:00 AM–4:00 PM HKT as the recurring meeting window if you work primarily from HKT and need JST colleagues present.
About HKT (Hong Kong Time)
Hong Kong Time (HKT) is fixed at UTC+08:00 all year and does not observe daylight saving time. Hong Kong last used summer time in 1979 and has kept a single offset since. HKT shares the UTC+08:00 offset with China Standard Time, Singapore Time, Malaysian Time, Philippine Time and Australian Western Standard Time, but is listed separately because Hong Kong maintains its own timekeeping authority. As a major financial centre, Hong Kong's trading hours set the rhythm for markets across Asia, opening at 09:30 HKT which is 01:30 in London and 20:30 the previous evening in New York.
About JST (Japan Standard Time)
Japan Standard Time (JST) is the standard time zone for all of Japan. Japan does not observe daylight saving time. JST is 9 hours ahead of UTC and 14 hours ahead of EST. The Tokyo Stock Exchange, the world's third largest by market capitalization, operates on JST. South Korea uses the same offset (KST) but it is a distinct time zone.
Best time to call between HKT and JST
Both HKT and JST sit inside the 9 AM – 5 PM working day between 9:00 AM–4:00 PM HKT, which is 10:00 AM–5:00 PM JST. That gives roughly 7 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
HKT and JST share 7 hours of working-hours overlap (9:00 AM–4:00 PM HKT), so scheduling a live meeting is straightforward.
HKT is 1 hour ahead of JST (HKT UTC+08:00 → JST UTC+09:00). The shared working window is 9:00 AM–4:00 PM HKT. 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 HKT and JST?
HKT (HKT, UTC+08:00) is 1 hour ahead of JST (JST, UTC+09:00). The gap is currently +1h.
How do I convert HKT time to JST time?
Add +1h to HKT local time. For example, 9:00 AM in HKT is 10:00 AM in JST.
What time is it in JST right now?
JST uses JST at UTC+09:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +1h offset from HKT.
What is the best time to call JST from HKT?
Call between 9:00 AM and 4:00 PM HKT — that maps to 10:00 AM–5:00 PM JST and keeps both parties inside the working day.
Which is ahead, HKT or JST?
HKT is 1 hour ahead of JST. When it is 12:00 PM in HKT it is 1:00 PM in JST.
Does daylight saving time affect the HKT–JST difference?
Neither zone observes daylight saving time, so the +1h offset between HKT and JST is fixed all year.
Which other cities share HKT's time zone?
HKT also covers Hong Kong, Kowloon, Tsuen Wan, Sha Tin.
Which countries use HKT, HKT's zone?
HKT is used in Hong Kong SAR.
Is there a day difference between HKT and JST?
Not normally. The +1h gap only pushes the date over for late-evening times.
What is the time difference between HKT and JST?
JST is +1h from HKT.
What timezone is HKT in?
HKT operates on its local timezone.
What timezone is JST in?
JST operates on its local timezone.
Which countries use HKT (Hong Kong Time)?
HKT is used in Hong Kong SAR.
Does HKT observe daylight saving time?
No, HKT does not observe daylight saving time and remains at UTC+08:00 year-round.
What are some interesting facts about HKT?
Hong Kong does not observe daylight saving time and has kept UTC+08:00 since 1979. HKT shares its offset with China Standard Time, Singapore Time and Philippine Time.
Which cities are in the JST timezone?
Major cities in the JST timezone include Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Kyoto, Kobe, Fukuoka.
What is the UTC offset for JST?
Japan Standard Time (JST) is at UTC+09:00.
What should I know about the JST timezone?
Japan does not observe daylight saving time. Tokyo is the most populous metropolitan area in the world.
When is it midnight in HKT, what time is it in JST?
When it is 12:00 AM (midnight) in HKT (HKT), it is +1h later in JST (JST).
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See every conversion from HKT →·See every conversion from JST →