Riyadh to Honolulu
-13hRiyadh
ASTSOURCEHonolulu
HSTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and HST on the World Map
The map below highlights the AST (Arabia Standard Time) and HST (Hawaii Standard Time) timezone regions across the globe.
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).
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).
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.
About Honolulu
WikipediaHonolulu operates on Hawaii Standard Time (HST), UTC-10 with no daylight saving. Hawaii's consistent time makes it a predictable connection between Asia and mainland USA.
Pearl Harbor memorial receives over 2 million visitors annually.
Comparing Time Zones: Riyadh and Honolulu
Riyadh runs on Arabian Standard Time (AST) at UTC+03:00. Honolulu runs on Hawaii-Aleutian Standard Time (HST) at UTC-10:00. That puts Riyadh 13 hours behind Honolulu — a difference of -13h at the current offsets.
In practice, when it is 9:00 AM in Riyadh it is 8:00 PM in Honolulu on the previous day. Midnight in Riyadh is 11:00 AM in Honolulu. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Riyadh to Honolulu time conversion table
| Riyadh (AST) | Honolulu (HST) | Day |
|---|---|---|
| 12:00 AM | 11:00 AM | previous day |
| 6:00 AM | 5:00 PM | previous day |
| 7:00 AM | 6:00 PM | previous day |
| 8:00 AM | 7:00 PM | previous day |
| 9:00 AM | 8:00 PM | previous day |
| 12:00 PM | 11:00 PM | previous day |
| 3:00 PM | 2:00 AM | same day |
| 5:00 PM | 4:00 AM | same day |
| 6:00 PM | 5:00 AM | same day |
| 9:00 PM | 8:00 AM | same day |
Why people convert Riyadh to Honolulu time
- Scheduling a call from Riyadh to Honolulu: a 10:00 AM start in Riyadh lands at 9:00 PM in Honolulu the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -13h gap: Riyadh and Honolulu 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 Honolulu is 8:00 PM in Riyadh.
- Coordinating a Riyadh-based team with Honolulu contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a -13h gap is not.
- With a -13h gap there is no shared 9-to-5 window, so alternate the early start: one week Riyadh takes the early slot, the next week Honolulu does.
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.
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 Riyadh and Honolulu
With a -13h offset there is no overlap inside a normal 9 AM – 5 PM day. Honolulu opens at 9:00 AM HST, which is 8:00 PM in Riyadh, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Riyadh and Honolulu have no shared working hours because of the -13h gap. Teams need to alternate early starts or rely on asynchronous handovers.
Riyadh is 13 hours behind Honolulu (AST UTC+03:00 → 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 Riyadh and Honolulu?
Riyadh (AST, UTC+03:00) is 13 hours behind Honolulu (HST, UTC-10:00). The gap is currently -13h.
How do I convert Riyadh time to Honolulu time?
Add -13h to Riyadh local time. For example, 9:00 AM in Riyadh is 8:00 PM in Honolulu (previous day).
What time is it in Honolulu right now?
Honolulu 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 -13h offset from Riyadh.
What is the best time to call Honolulu from Riyadh?
There is no shared working-hours window because of the -13h gap. The closest option is 1:00 PM in Riyadh, which is 12:00 AM in Honolulu.
Which is behind, Riyadh or Honolulu?
Riyadh is 13 hours behind Honolulu. When it is 12:00 PM in Riyadh it is 11:00 PM in Honolulu.
Do Riyadh and Honolulu use different time zones?
Riyadh (Saudi Arabia) uses AST at UTC+03:00, while Honolulu (USA) uses HST at UTC-10:00. The IANA identifiers are Asia/Riyadh and Pacific/Honolulu.
Does daylight saving time affect the Riyadh–Honolulu difference?
Neither zone observes daylight saving time, so the -13h offset between Riyadh and Honolulu is fixed all year.
Which other cities share Riyadh's time zone?
AST also covers Riyadh, Jeddah, Doha, Kuwait City, Baghdad.
Which countries use AST, Riyadh's zone?
AST is used in Saudi Arabia, Qatar, Kuwait, Bahrain, Iraq, Yemen.
Is there a day difference between Riyadh and Honolulu?
Sometimes. The -13h gap is large enough that 8:00 PM or later in Riyadh already falls on the in Honolulu.
What is the time difference between Riyadh and Honolulu?
Honolulu is -13h from Riyadh.
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 timezone is Honolulu in?
Honolulu operates on Hawaii Standard Time (HST), UTC-10 with no daylight saving. Hawaii's consistent time makes it a predictable connection between Asia and mainland USA.
What are the business hours in Riyadh?
Standard business hours in Riyadh are 8:00 AM - 4:00 PM AST (Sunday-Thursday).
What are the business hours in Honolulu?
Standard business hours in Honolulu are 8:00 AM - 5:00 PM HST.
What is the best time to schedule a call between Riyadh and Honolulu?
The best overlap for a call is when both cities are in business hours. Riyadh works 8:00 AM - 4:00 PM AST (Sunday-Thursday) and Honolulu works 8:00 AM - 5:00 PM HST (-13h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Riyadh and Honolulu?
Riyadh uses SAR (﷼) while Honolulu uses USD ($). Check current exchange rates when planning travel or business between these cities.
How do Riyadh and Honolulu compare in size?
Riyadh has a population of approximately 7.7 million (metro: 7.7 million), while Honolulu has approximately 350,000 (metro: 1 million).
What are the major landmarks in Riyadh and Honolulu?
Riyadh is known for Kingdom Centre, Masmak Fortress, National Museum. Honolulu is famous for Waikiki Beach, Diamond Head, Pearl Harbor.
Do Riyadh and Honolulu have stock exchanges?
Yes. Riyadh has the Tadawul (Saudi Stock Exchange) and Honolulu has the N/A (Uses NYSE/NASDAQ). The -13h time difference affects trading hour overlaps between these exchanges.
Which countries use AST (Arabia Standard Time)?
AST is used in Saudi Arabia, Qatar, Kuwait, Bahrain, Iraq, Yemen.
Does AST observe daylight saving time?
No, AST does not observe daylight saving time and remains at UTC+03:00 year-round.
What are some interesting facts about AST?
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.
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 Riyadh, what time is it in Honolulu?
When it is 12:00 AM (midnight) in Riyadh (AST), it is -13h later in Honolulu (HST).
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