Honolulu to Singapore
+18hHonolulu
HSTSOURCESingapore
SGTGreen rows indicate typical business hours (9 AM - 5 PM)
HST and SGT on the World Map
The map below highlights the HST (Hawaii Standard Time) and SGT (Singapore 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).
SGT – Singapore Standard Time
UTC+08:00Singapore Standard Time (SGT) is the time zone for Singapore, 8 hours ahead of UTC.
- •Singapore uses UTC+08:00 despite being at about 104°E longitude (closer to UTC+07:00).
- •Singapore does not observe daylight saving time.
- •The Singapore Exchange (SGX) operates on SGT.
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 Singapore
WikipediaSingapore Standard Time (SGT) is 8 hours ahead of GMT. As Asia's leading financial hub, Singapore bridges business hours between Europe and Australia.
The city-state has the world's highest percentage of millionaires, with 1 in 6 households.
Honolulu vs Singapore: Offsets, DST and Best Call Times
Honolulu runs on Hawaii-Aleutian Standard Time (HST) at UTC-10:00. Singapore runs on Singapore Standard Time (SGT) at UTC+08:00. That puts Honolulu 18 hours ahead of Singapore — a difference of +18h at the current offsets.
In practice, when it is 9:00 AM in Honolulu it is 3:00 AM in Singapore on the next day. Midnight in Honolulu is 6:00 PM in Singapore. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Honolulu to Singapore time conversion table
| Honolulu (HST) | Singapore (SGT) | Day |
|---|---|---|
| 12:00 AM | 6:00 PM | same day |
| 6:00 AM | 12:00 AM | next day |
| 7:00 AM | 1:00 AM | next day |
| 8:00 AM | 2:00 AM | next day |
| 9:00 AM | 3:00 AM | next day |
| 12:00 PM | 6:00 AM | next day |
| 3:00 PM | 9:00 AM | next day |
| 5:00 PM | 11:00 AM | next day |
| 6:00 PM | 12:00 PM | next day |
| 9:00 PM | 3:00 PM | next day |
Why people convert Honolulu to Singapore time
- Scheduling a call from Honolulu to Singapore: a 10:00 AM start in Honolulu lands at 4:00 AM in Singapore the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +18h gap: Honolulu and Singapore 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 Singapore is 3:00 AM in Honolulu.
- Watching a live event or market open: Honolulu viewers need 3:00 AM in Singapore to catch a 9:00 AM start there, and 6:00 AM if the event is anchored to Honolulu.
- Always state the zone abbreviation, not just the hour. "3:00 PM HST" is unambiguous; "3 PM" across a +18h gap is not.
- With a +18h gap there is no shared 9-to-5 window, so alternate the early start: one week Honolulu takes the early slot, the next week Singapore 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 SGT (Singapore Standard Time)
Singapore Standard Time (SGT) is used in Singapore year-round. Singapore does not observe daylight saving time. Despite being geographically close to the UTC+07:00 zone, Singapore uses UTC+08:00 to align with major trading partners like China, Hong Kong, and Malaysia. Singapore is a major global financial hub.
Best time to call between Honolulu and Singapore
With a +18h offset there is no overlap inside a normal 9 AM – 5 PM day. Singapore opens at 9:00 AM SGT, which is 3:00 AM in Honolulu, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Honolulu and Singapore have no shared working hours because of the +18h gap. Teams need to alternate early starts or rely on asynchronous handovers.
Honolulu is 18 hours ahead of Singapore (HST UTC-10:00 → SGT UTC+08:00). 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 Singapore?
Honolulu (HST, UTC-10:00) is 18 hours ahead of Singapore (SGT, UTC+08:00). The gap is currently +18h.
How do I convert Honolulu time to Singapore time?
Add +18h to Honolulu local time. For example, 9:00 AM in Honolulu is 3:00 AM in Singapore (next day).
What time is it in Singapore right now?
Singapore uses SGT at UTC+08:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +18h offset from Honolulu.
What is the best time to call Singapore from Honolulu?
There is no shared working-hours window because of the +18h gap. The closest option is 1:00 PM in Honolulu, which is 7:00 AM in Singapore.
Which is ahead, Honolulu or Singapore?
Honolulu is 18 hours ahead of Singapore. When it is 12:00 PM in Honolulu it is 6:00 AM in Singapore.
Do Honolulu and Singapore use different time zones?
Honolulu (USA) uses HST at UTC-10:00, while Singapore (Singapore) uses SGT at UTC+08:00. The IANA identifiers are Pacific/Honolulu and Asia/Singapore.
Does daylight saving time affect the Honolulu–Singapore difference?
Neither zone observes daylight saving time, so the +18h offset between Honolulu and Singapore 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 Singapore?
Sometimes. The +18h gap is large enough that 8:00 PM or later in Honolulu already falls on the next day in Singapore.
What is the time difference between Honolulu and Singapore?
Singapore is +18h 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 Singapore in?
Singapore Standard Time (SGT) is 8 hours ahead of GMT. As Asia's leading financial hub, Singapore bridges business hours between Europe and Australia.
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 Singapore?
Standard business hours in Singapore are 9:00 AM - 6:00 PM SGT.
What is the best time to schedule a call between Honolulu and Singapore?
The best overlap for a call is when both cities are in business hours. Honolulu works 8:00 AM - 5:00 PM HST and Singapore works 9:00 AM - 6:00 PM SGT (+18h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Honolulu and Singapore?
Honolulu uses USD ($) while Singapore uses SGD (S$). Check current exchange rates when planning travel or business between these cities.
How do Honolulu and Singapore compare in size?
Honolulu has a population of approximately 350,000 (metro: 1 million), while Singapore has approximately 5.5 million (metro: 5.9 million).
What are the major landmarks in Honolulu and Singapore?
Honolulu is known for Waikiki Beach, Diamond Head, Pearl Harbor. Singapore is famous for Marina Bay Sands, Gardens by the Bay, Merlion.
Do Honolulu and Singapore have stock exchanges?
Yes. Honolulu has the N/A (Uses NYSE/NASDAQ) and Singapore has the SGX (Singapore Exchange). The +18h 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 SGT timezone?
Major cities in the SGT timezone include Singapore.
What is the UTC offset for SGT?
Singapore Standard Time (SGT) is at UTC+08:00.
What should I know about the SGT timezone?
Singapore uses UTC+08:00 despite being at about 104°E longitude (closer to UTC+07:00). Singapore does not observe daylight saving time.
When is it midnight in Honolulu, what time is it in Singapore?
When it is 12:00 AM (midnight) in Honolulu (HST), it is +18h later in Singapore (SGT).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More Honolulu time conversions
- honolulu to new york
- honolulu to los angeles
- honolulu to chicago
- honolulu to denver
- honolulu to anchorage
- honolulu to hst
- honolulu to auckland
- honolulu to london
- honolulu to dubai
- honolulu to tokyo
- honolulu to sydney
- honolulu to paris
- honolulu to delhi
- honolulu to mumbai
- honolulu to berlin
- honolulu to hong kong
- honolulu to toronto
- honolulu to kathmandu
- new york to honolulu
- london to honolulu
- dubai to honolulu
- tokyo to honolulu
- singapore to honolulu
- sydney to honolulu
- los angeles to honolulu
- paris to honolulu
- delhi to honolulu
- mumbai to honolulu
- berlin to honolulu
- hong kong to honolulu
- toronto to honolulu
- kathmandu to honolulu
See every conversion from Honolulu →·See every conversion from Singapore →