HST to SST Converter
Convert time between Hawaii Standard Time (HST) and Samoa Standard Time (SST)
Hawaii Standard Time (HST)
Samoa Standard Time (SST)
Time Difference
Samoa Standard Time (SST) is 0 hours ahead of Hawaii Standard Time (HST)
Select Date
Select Time
Quick Reference
| HST | SST |
|---|---|
| 16:00 | 15:00 |
| 18:00 | 17:00 |
| 20:00 | 19:00 |
| 22:00 | 21:00 |
| 00:00 | 23:00 |
| 02:00 | 01:00 |
| 04:00 | 03:00 |
| 06:00 | 05:00 |
| 08:00 | 07:00 |
| 10:00 | 09:00 |
| 12:00 | 11:00 |
| 14:00 | 13:00 |
Top 10 Most Common Time Zones
| Abbreviation | Full Name | UTC Offset | Typical Use |
|---|---|---|---|
| UTC | Coordinated Universal Time | UTC ±0 | Global reference standard (servers, logs, APIs) |
| EST / EDT | Eastern (US) Time | UTC −5 / −4 | New York, Toronto — North American business hub |
| CST / CDT | Central (US) Time | UTC −6 / −5 | Chicago, Dallas — US central business region |
| PST / PDT | Pacific (US) Time | UTC −8 / −7 | San Francisco, Los Angeles — tech industry standard |
| GMT / BST | Greenwich Mean / British Summer Time | UTC 0 / +1 | UK, used globally as a reference with UTC |
| CET / CEST | Central European (Summer) Time | UTC +1 / +2 | Paris, Berlin, Amsterdam — EU business core |
| IST | India Standard Time | UTC +5:30 | India — major IT & outsourcing region |
| CST | China Standard Time | UTC +8 | Beijing, Shanghai — East Asia business hub |
| JST | Japan Standard Time | UTC +9 | Tokyo — finance & tech hub |
| AEST / AEDT | Australian Eastern (Daylight) Time | UTC +10 / +11 | Sydney, Melbourne — APAC regional business |
Why Time Zone Abbreviations Are Ambiguous
Unlike standardized identifiers (like America/New_York or Europe/London from the IANA tz database), abbreviations such as "CST" or "IST" are not globally unique. They can refer to different time zones depending on context — country, region, or even time of year (due to daylight saving time).
Common Ambiguous Time Zone Abbreviations
| Abbrev. | Common Meaning(s) | UTC Offset | Region(s) |
|---|---|---|---|
| CST | Central Standard Time / China Standard Time / Cuba Standard Time | UTC−6 / UTC+8 / UTC−5 | North America, China, Cuba |
| IST | Indian Standard Time / Irish Standard Time / Israel Standard Time | UTC+5:30 / UTC+1 / UTC+2 | India, Ireland, Israel |
| AST | Atlantic Standard Time / Arabia Standard Time | UTC−4 / UTC+3 | Caribbean, Canada, Middle East |
| PST | Pacific Standard Time / Philippine Standard Time | UTC−8 / UTC+8 | North America, Philippines |
| EST | Eastern Standard Time (North America / Australia) | UTC−5 / UTC+10 | North America, Australia |
✅ Best Practice
To avoid ambiguity, always:
- Use IANA tz identifiers — e.g.,
America/New_Yorkinstead of "EST" - Specify UTC offset explicitly — e.g.,
UTC−5when abbreviations must be used - Include the full timezone name — e.g., "Eastern Standard Time (EST)" with UTC offset
About HST to SST Time Conversion
Converting time between Hawaii Standard Time (HST) and Samoa Standard Time (SST) is the simplest Pacific-to-South-Pacific conversion you'll meet. HST is UTC-10 and SST is UTC-11, putting American Samoa just 1 hour behind Hawaii. Neither side observes daylight saving — Hawaii never adopted it, and American Samoa stays on SST year-round — so the 1-hour offset is identical every day of the year.
This converter uses the IANA timezone database (Pacific/Honolulu and Pacific/Pago_Pago) to give accurate results. Whether you're booking a call between Honolulu and Pago Pago, coordinating with Pacific island businesses, or planning a quick island-hop, the tool removes the manual offset arithmetic for what is essentially a one-hour adjustment.
Common Use Cases for HST to SST Conversion
Business & Work
- Scheduling video calls between Honolulu and American Samoa
- Coordinating Pacific island logistics, fisheries, and tourism operations
- Managing US territory operations across HST and SST
Personal & Travel
- Calling family between Hawaii and American Samoa
- Planning flights between Honolulu and Pago Pago
- Coordinating cross-island events for the Pacific diaspora
Time Zone Information
Hawaii Standard Time (HST)
- UTC Offset: UTC-10
- IANA Timezone: Pacific/Honolulu
- Daylight Saving: None - Hawaii does not observe daylight saving time
- Major Cities: Honolulu, Hilo, Kailua, Kaneohe, Pearl City
- Coverage: Hawaii
Samoa Standard Time (SST)
- UTC Offset: UTC-11
- IANA Timezone: Pacific/Pago_Pago
- Daylight Saving: None - American Samoa does not observe daylight saving time
- Major Cities: Pago Pago, Tafuna, Nu'uuli, Faleniu, Aua
- Coverage: American Samoa and Midway Atoll
Quick Reference: HST to SST
Remember: SST is always 1 hour behind HST. Neither timezone observes daylight saving, so the offset stays the same year-round.
Frequently Asked Questions
What is the time difference between HST and SST?
Hawaii Standard Time (HST) is UTC-10, while Samoa Standard Time (SST) is UTC-11. SST is just 1 hour behind HST. When it is 12:00 PM in Honolulu, it is 11:00 AM in Pago Pago.
When does this HST to SST conversion apply?
It applies year-round. Neither Hawaii nor American Samoa observes daylight saving time, so the 1-hour offset is stable in every month of the year.
How does the time difference change throughout the year?
It does not change. HST stays on UTC-10 and SST stays on UTC-11 year-round. That makes this one of the most predictable Pacific conversions.
What are the best times for HST–SST business calls?
A 1-hour gap means business hours align almost perfectly. Any normal working slot in Honolulu works equally well for Pago Pago — schedule whatever suits both calendars.
Which countries and regions use SST?
Samoa Standard Time (UTC-11) is used in American Samoa and the uninhabited Midway Atoll. The independent state of Samoa is on UTC+13, on the opposite side of the international date line. Major American Samoa locations include Pago Pago, Tafuna, and Nu’uuli.
Which countries and regions use HST?
Hawaii Standard Time covers the state of Hawaii. Major cities include Honolulu, Hilo, Kailua, Kaneohe, and Pearl City. Hawaii does not observe daylight saving time.
Pro Tips
- • SST is always 1 hour behind HST — no DST on either side, so the offset is rock-solid year-round.
- • Both Pago Pago and Honolulu sit on the same side of the international date line, so dates always match.
- • Any working slot in Honolulu works fine in Pago Pago and vice versa.
- • No seasonal shift to worry about — recurring meetings will not drift twice a year.
- • Treat this like an in-region conversion: simple, predictable, no date-line confusion.
- • For one-off calls, double-check the IANA zones (Pacific/Honolulu, Pacific/Pago_Pago) in your calendar tool.