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