SST to GMT Converter
Convert time between Samoa Standard Time (SST) and Greenwich Mean Time (GMT)
Samoa Standard Time (SST)
Greenwich Mean Time (GMT)
Time Difference
Greenwich Mean Time (GMT) is 0 hours ahead of Samoa Standard Time (SST)
Select Date
Select Time
Quick Reference
| SST | GMT |
|---|---|
| 15:00 | 03:00 |
| 17:00 | 05:00 |
| 19:00 | 07:00 |
| 21:00 | 09:00 |
| 23:00 | 11:00 |
| 01:00 | 13:00 |
| 03:00 | 15:00 |
| 05:00 | 17:00 |
| 07:00 | 19:00 |
| 09:00 | 21:00 |
| 11:00 | 23:00 |
| 13:00 | 01:00 |
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 SST to GMT Time Conversion
Converting time between Samoa Standard Time (SST) and Greenwich Mean Time (GMT) bridges the South Pacific and the prime meridian. SST is UTC-11 and stays constant year-round (American Samoa does not observe daylight saving time), while GMT is UTC+0. That makes GMT 11 hours ahead of SST during the UK winter — from the last Sunday in October to the last Sunday in March. From late March to late October the UK shifts to BST (UTC+1) and the gap widens to 12 hours.
This converter uses the IANA timezone database to handle UK DST transitions automatically. Whether you're booking a call between Pago Pago and London or Dublin, coordinating with year-round GMT users in Iceland or West Africa, or scheduling against UTC-aligned reference times, the tool removes the manual offset arithmetic.
Common Use Cases for SST to GMT Conversion
Business & Work
- Scheduling video calls between American Samoa and London, Dublin, or Reykjavík in winter
- Coordinating Pacific–UK and Pacific–West Africa remote team handoffs
- Aligning with GMT-anchored reference times for shipping, aviation, or scientific work
Personal & Travel
- Calling family in the UK or Ireland from American Samoa during winter
- Planning flight connections via Los Angeles or Auckland to London
- Watching live Premier League and other UK broadcasts during winter
Time Zone Information
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
Greenwich Mean Time (GMT)
- UTC Offset: UTC+0 (UTC+1 during BST in the UK)
- IANA Timezone: Europe/London
- Daylight Saving: GMT applies in the UK during winter; switches to BST (UTC+1) late March to late October. Iceland and several West African countries stay on GMT year-round.
- Major Cities: London, Dublin, Reykjavík, Lisbon, Accra
- Coverage: United Kingdom in winter, Iceland and parts of West Africa year-round
Quick Reference: SST to GMT
Remember: GMT is 11 hours ahead of SST. From late March to late October the UK shifts to BST (UTC+1) and the gap becomes 12 hours; Iceland and several West African countries stay on GMT year-round.
Frequently Asked Questions
What is the time difference between SST and GMT?
Samoa Standard Time (SST) is UTC-11, while Greenwich Mean Time (GMT) is UTC+0. GMT is 11 hours ahead of SST. When it is 12:00 PM in Pago Pago, it is 11:00 PM the same day in London (during winter) or Reykjavík (year-round).
When does this SST to GMT conversion apply?
In the UK and Ireland it applies during winter, from the last Sunday in October to the last Sunday in March. Outside that window the UK shifts to BST (UTC+1) and the gap widens to 12 hours. Iceland and several West African countries stay on GMT year-round. American Samoa stays on SST (UTC-11) year-round.
How does the time difference change throughout the year?
For the UK and Ireland the gap is 11 hours during GMT and 12 hours during BST. For Iceland, Ghana, and other year-round GMT countries the gap stays at a stable 11 hours regardless of season.
What are the best times for SST–GMT business calls?
Morning SST aligns with evening GMT. For example, 8:00–10:00 AM SST is 7:00–9:00 PM GMT — late evening for London but workable, especially for short calls. For UK office hours, schedule late evening Pago Pago against morning London.
Which countries and regions use GMT?
GMT applies in the UK and Ireland during winter, and year-round in Iceland, Portugal (mainland), the Faroe Islands, and several West African countries including Ghana, Senegal, and Burkina Faso.
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.
Pro Tips
- • GMT is 11 hours ahead of SST; Pago Pago noon is 11:00 PM in London.
- • When the UK switches to BST in late March the gap widens to 12 hours; re-pin recurring meetings.
- • Iceland and several West African countries stay on GMT year-round, giving a stable 11-hour offset.
- • For UK office hours overlap, target Pago Pago late evening against London morning.
- • American Samoa never observes daylight saving, so any seasonal shift is from the GMT side.
- • For one-off calls, double-check the IANA zones (Pacific/Pago_Pago, Europe/London) in your calendar tool.