SGT to HST Converter & Meeting Planner
Quick answer: 9:00 AM SGT = 3:00 PM HST (fixed +08:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Singapore Time (SGT) and Hawaii-Aleutian Standard Time (HST)? You need to account for the standard time difference. Hawaii-Aleutian Standard Time is normally 18 hours behind Singapore Time. Whether you are coordinating between teams in Singapore and Honolulu and Hilo, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM SGT = 6:00 AM HST. The full 24-hour SGT to HST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM SGT = 9:00 PM HST (-1 day).
| SGT Time | HST Time |
|---|---|
| 12:00 AM (00:00) | 6:00 AM (06:00)-1 day |
| 1:00 AM (01:00) | 7:00 AM (07:00)-1 day |
| 2:00 AM (02:00) | 8:00 AM (08:00)-1 day |
| 3:00 AM (03:00) | 9:00 AM (09:00)-1 day |
| 4:00 AM (04:00) | 10:00 AM (10:00)-1 day |
| 5:00 AM (05:00) | 11:00 AM (11:00)-1 day |
| 6:00 AM (06:00) | 12:00 PM (12:00)-1 day |
| 7:00 AM (07:00) | 1:00 PM (13:00)-1 day |
| 8:00 AM (08:00) | 2:00 PM (14:00)-1 day |
| 9:00 AM (09:00) | 3:00 PM (15:00)-1 day |
| 10:00 AM (10:00) | 4:00 PM (16:00)-1 day |
| 11:00 AM (11:00) | 5:00 PM (17:00)-1 day |
| 12:00 PM (12:00) | 6:00 PM (18:00)-1 day |
| 1:00 PM (13:00) | 7:00 PM (19:00)-1 day |
| 2:00 PM (14:00) | 8:00 PM (20:00)-1 day |
| 3:00 PM (15:00) | 9:00 PM (21:00)-1 day |
| 4:00 PM (16:00) | 10:00 PM (22:00)-1 day |
| 5:00 PM (17:00) | 11:00 PM (23:00)-1 day |
| 6:00 PM (18:00) | 12:00 AM (00:00) |
| 7:00 PM (19:00) | 1:00 AM (01:00) |
| 8:00 PM (20:00) | 2:00 AM (02:00) |
| 9:00 PM (21:00) | 3:00 AM (03:00) |
| 10:00 PM (22:00) | 4:00 AM (04:00) |
| 11:00 PM (23:00) | 5:00 AM (05:00) |
Best time to call Honolulu from Singapore
For most work calls, compare the normal business day in Singapore (SGT) with the business day in Honolulu (HST). SGT commonly covers Southeast Asia, Asia-Pacific, while HST is mainly associated with Pacific Ocean, North America.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
✅ The most practical overlap on 2026-07-05 is usually 9:00 AM - 11:00 AM SGT, which corresponds to 3:00 PM - 5:00 PM HST. This window sits inside the typical SGT workday (9:00 AM - 6:00 PM) and the HST workday (9:00 AM - 5:00 PM).
- DST Safety: SGT or HST may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Singapore Exchange (SGX): 09:00-17:00 local time in Singapore.
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Frequently Asked Questions
What is the time difference between SGT and HST?
During standard time, Hawaii-Aleutian Standard Time is 18 hours behind Singapore Time.
Does Singapore use Daylight Saving Time?
Singapore does not observe Daylight Saving Time and has no policy to introduce it, remaining fixed at UTC+8:00 every day of the year. Singapore's location approximately one degree north of the equator means daylight hours remain nearly constant across the seasons, removing the original rationale for DST entirely.
Which other major countries share Singapore's time zone?
China, Hong Kong, Taiwan, Malaysia, and Western Australia all operate on the same UTC+8:00 offset as Singapore, though each uses its own regional designation — CST, HKT, CST, MYT, and AWST respectively. Collectively, the UTC+8 bloc represents one of the world's most economically significant time bands.
Does Hawaii observe Daylight Saving Time?
Hawaii does not observe Daylight Saving Time and has not done so since 1947, remaining fixed at UTC-10:00 year-round. At roughly 20° North latitude, Hawaii's daylight hours vary by only about 1.5 hours between the summer and winter solstices — far too little to justify the disruption of a seasonal clock change.
Why is it called Hawaii-Aleutian time?
The name combines two geographically distant US territories that share the same UTC-10:00 standard offset: the Hawaiian Islands in the central Pacific and the westernmost Aleutian Islands of Alaska, which extend past the 180° meridian into the Eastern Hemisphere. Despite sharing a base offset, they behave differently — Hawaii observes no DST, while the Aleutian communities such as Adak do advance to HDT (UTC-9) each summer.