Honolulu to SGT
+18hHonolulu
HSTSOURCESGT
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.
Honolulu vs SGT: Offsets, DST and Best Call Times
Honolulu runs on Hawaii-Aleutian Standard Time (HST) at UTC-10:00. SGT runs on Singapore Standard Time (SGT) at UTC+08:00. That puts Honolulu 18 hours ahead of SGT — a difference of +18h at the current offsets.
In practice, when it is 9:00 AM in Honolulu it is 3:00 AM in SGT on the next day. Midnight in Honolulu is 6:00 PM in SGT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Honolulu to SGT time conversion table
| Honolulu (HST) | SGT (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 SGT time
- Scheduling a call from Honolulu to SGT: a 10:00 AM start in Honolulu lands at 4:00 AM in SGT the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +18h gap: Honolulu and SGT 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 SGT is 3:00 AM in Honolulu.
- Watching a live event or market open: Honolulu viewers need 3:00 AM in SGT 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 SGT 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 SGT
With a +18h offset there is no overlap inside a normal 9 AM – 5 PM day. SGT 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 SGT 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 SGT (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 SGT?
Honolulu (HST, UTC-10:00) is 18 hours ahead of SGT (SGT, UTC+08:00). The gap is currently +18h.
How do I convert Honolulu time to SGT time?
Add +18h to Honolulu local time. For example, 9:00 AM in Honolulu is 3:00 AM in SGT (next day).
What time is it in SGT right now?
SGT 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 SGT 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 SGT.
Which is ahead, Honolulu or SGT?
Honolulu is 18 hours ahead of SGT. When it is 12:00 PM in Honolulu it is 6:00 AM in SGT.
Do Honolulu and SGT use different time zones?
Honolulu (USA) uses HST at UTC-10:00, while SGT uses SGT at UTC+08:00. The IANA identifiers are Pacific/Honolulu and Asia/Singapore.
Does daylight saving time affect the Honolulu–SGT difference?
Neither zone observes daylight saving time, so the +18h offset between Honolulu and SGT 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 SGT?
Sometimes. The +18h gap is large enough that 8:00 PM or later in Honolulu already falls on the next day in SGT.
What is the time difference between Honolulu and SGT?
SGT 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 SGT in?
SGT operates on its local timezone.
What are the business hours in Honolulu?
Standard business hours in Honolulu are 8:00 AM - 5:00 PM HST.
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 SGT?
When it is 12:00 AM (midnight) in Honolulu (HST), it is +18h later in SGT (SGT).
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