HKT to Riyadh
-5hHKT
HKTSOURCERiyadh
ASTGreen rows indicate typical business hours (9 AM - 5 PM)
HKT and AST on the World Map
The map below highlights the HKT (Hong Kong Time) and AST (Arabia 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.
AST – Arabia Standard Time
UTC+03:00Arabia Standard Time (AST, UTC+03:00) is the time zone for Saudi Arabia and the other Gulf states of the Arabian peninsula.
- •None of the Gulf states on Arabia Standard Time observe daylight saving.
- •AST is the same offset as Moscow Standard Time and East Africa Time.
- •Riyadh is one hour ahead of Central European Time in winter.
- •The AST abbreviation is shared with Atlantic Standard Time (UTC-04:00).
About Riyadh
WikipediaRiyadh operates on Arabia Standard Time (AST), UTC+3. As OPEC's de facto capital and home to Tadawul, Riyadh time impacts global energy markets.
Riyadh is growing rapidly as part of Saudi Vision 2030 modernization.
Understanding the -5h Gap: HKT vs Riyadh
HKT runs on Hong Kong Time (HKT) at UTC+08:00. Riyadh runs on Arabian Standard Time (AST) at UTC+03:00. That puts HKT 5 hours behind Riyadh — a difference of -5h at the current offsets.
In practice, when it is 9:00 AM in HKT it is 4:00 AM in Riyadh. Midnight in HKT is 7:00 PM in Riyadh. Neither zone observes daylight saving time, so the offset between them stays constant all year.
HKT to Riyadh time conversion table
| HKT (HKT) | Riyadh (AST) | Day |
|---|---|---|
| 12:00 AM | 7:00 PM | previous day |
| 6:00 AM | 1:00 AM | same day |
| 7:00 AM | 2:00 AM | same day |
| 8:00 AM | 3:00 AM | same day |
| 9:00 AM | 4:00 AM | same day |
| 12:00 PM | 7:00 AM | same day |
| 3:00 PM | 10:00 AM | same day |
| 5:00 PM | 12:00 PM | same day |
| 6:00 PM | 1:00 PM | same day |
| 9:00 PM | 4:00 PM | same day |
Why people convert HKT to Riyadh time
- Scheduling a call from HKT to Riyadh: a 10:00 AM start in HKT lands at 5:00 AM in Riyadh, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both HKT and Riyadh are inside the 9-to-5 working day between 2:00 PM and 5:00 PM HKT time (9:00 AM–12:00 PM AST). That is roughly 3 hours of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in HKT is 3:00 PM in Riyadh 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 -5h gap is not.
- Block 2:00 PM–5:00 PM HKT as the recurring meeting window if you work primarily from HKT and need Riyadh 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 AST (Arabia Standard Time)
Arabia Standard Time (AST) is fixed at UTC+03:00 all year across Saudi Arabia, Qatar, Kuwait, Bahrain, Iraq and Yemen. None of these countries observes daylight saving time, so the offset never changes. The abbreviation collides with Atlantic Standard Time (UTC-04:00) used in eastern Canada and the Caribbean; this page covers the Arabian peninsula meaning. Arabia Standard Time is the same offset as Moscow Standard Time and East Africa Time, which makes scheduling with Europe straightforward — Riyadh is one hour ahead of Central European Time in winter and level with it during European summer time.
Best time to call between HKT and Riyadh
Both HKT and Riyadh sit inside the 9 AM – 5 PM working day between 2:00 PM–5:00 PM HKT, which is 9:00 AM–12:00 PM AST. That gives roughly 3 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
HKT and Riyadh overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.
HKT is 5 hours behind Riyadh (HKT UTC+08:00 → AST UTC+03:00). The shared working window is 2:00 PM–5:00 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 Riyadh?
HKT (HKT, UTC+08:00) is 5 hours behind Riyadh (AST, UTC+03:00). The gap is currently -5h.
How do I convert HKT time to Riyadh time?
Add -5h to HKT local time. For example, 9:00 AM in HKT is 4:00 AM in Riyadh.
What time is it in Riyadh right now?
Riyadh uses AST at UTC+03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -5h offset from HKT.
What is the best time to call Riyadh from HKT?
Call between 2:00 PM and 5:00 PM HKT — that maps to 9:00 AM–12:00 PM AST and keeps both parties inside the working day.
Which is behind, HKT or Riyadh?
HKT is 5 hours behind Riyadh. When it is 12:00 PM in HKT it is 7:00 AM in Riyadh.
Do HKT and Riyadh use different time zones?
HKT uses HKT at UTC+08:00, while Riyadh (Saudi Arabia) uses AST at UTC+03:00. The IANA identifiers are Asia/Hong_Kong and Asia/Riyadh.
Does daylight saving time affect the HKT–Riyadh difference?
Neither zone observes daylight saving time, so the -5h offset between HKT and Riyadh 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 Riyadh?
Not normally. The -5h gap only pushes the date over the previous day.
What is the time difference between HKT and Riyadh?
Riyadh is -5h from HKT.
What timezone is HKT in?
HKT operates on its local timezone.
What timezone is Riyadh in?
Riyadh operates on Arabia Standard Time (AST), UTC+3. As OPEC's de facto capital and home to Tadawul, Riyadh time impacts global energy markets.
What are the business hours in Riyadh?
Standard business hours in Riyadh are 8:00 AM - 4:00 PM AST (Sunday-Thursday).
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 AST timezone?
Major cities in the AST timezone include Riyadh, Jeddah, Doha, Kuwait City, Baghdad.
What is the UTC offset for AST?
Arabia Standard Time (AST) is at UTC+03:00.
What should I know about the AST timezone?
None of the Gulf states on Arabia Standard Time observe daylight saving. AST is the same offset as Moscow Standard Time and East Africa Time.
When is it midnight in HKT, what time is it in Riyadh?
When it is 12:00 AM (midnight) in HKT (HKT), it is -5h later in Riyadh (AST).
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