BST to SST Converter
Convert time between British Summer Time (BST) and Samoa Standard Time (SST)
British Summer Time (BST)
Samoa Standard Time (SST)
Time Difference
Samoa Standard Time (SST) is 0 hours ahead of British Summer Time (BST)
Select Date
Select Time
Quick Reference
| BST | SST |
|---|---|
| 03:00 | 15:00 |
| 05:00 | 17:00 |
| 07:00 | 19:00 |
| 09:00 | 21:00 |
| 11:00 | 23:00 |
| 13:00 | 01:00 |
| 15:00 | 03:00 |
| 17:00 | 05:00 |
| 19:00 | 07:00 |
| 21:00 | 09:00 |
| 23:00 | 11:00 |
| 01:00 | 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 BST to SST Time Conversion
Converting time between British Summer Time (BST) and Samoa Standard Time (SST) bridges the United Kingdom and the South Pacific. BST is UTC+1, while SST is UTC-11 and stays constant year-round (American Samoa does not observe daylight saving time). That makes SST exactly 12 hours behind BST — a clean half-day offset, but with the international date line in between. BST applies in the UK from the last Sunday in March to the last Sunday in October; outside that window the relevant timezone is GMT (UTC+0) and the gap drops to 11 hours.
This converter uses the IANA timezone database to handle the UK's DST transitions automatically. Whether you're booking a call between London and Pago Pago, watching live Premier League matches from American Samoa, or coordinating with Pacific-based teams during British summer, the tool removes the off-by-one-day confusion that catches people out converting between the UK and American Samoa.
Common Use Cases for BST to SST Conversion
Business & Work
- Scheduling video calls between London and American Samoa during British summer
- Coordinating UK–Pacific remote team handoffs and project work
- Planning live broadcasts and webinars between the UK and Pago Pago
Personal & Travel
- Calling family in American Samoa from the UK
- Planning flight connections via Los Angeles or Auckland from London
- Coordinating Pacific travel itineraries and live-event watch parties
Time Zone Information
British Summer Time (BST)
- UTC Offset: UTC+1
- IANA Timezone: Europe/London
- Daylight Saving: Last Sunday in March to last Sunday in October (BST)
- Major Cities: London, Manchester, Birmingham, Edinburgh, Glasgow
- Coverage: United Kingdom during summer months
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: BST to SST
Remember: SST is 12 hours behind BST. Outside British Summer Time the UK is on GMT (UTC+0) and the gap is 11 hours.
Frequently Asked Questions
What is the time difference between BST and SST?
British Summer Time (BST) is UTC+1, while Samoa Standard Time (SST) is UTC-11. SST is 12 hours behind BST. When it is 12:00 PM in London, it is 12:00 AM (midnight) the same day in Pago Pago.
When does this BST to SST conversion apply?
It applies during British Summer Time, from the last Sunday in March to the last Sunday in October. Outside that window the UK is on GMT (UTC+0) and the gap is 11 hours. American Samoa stays on SST (UTC-11) year-round.
How does the time difference change throughout the year?
The gap is 12 hours during BST (late March to late October) and 11 hours during GMT (late October to late March). American Samoa never observes daylight saving, so any seasonal change comes from the UK side.
What are the best times for BST–SST business calls?
A 12-hour offset is challenging — when one side is awake the other is asleep. The most workable overlap is late evening BST against early morning SST: 7:00–9:00 PM BST is 7:00–9:00 AM SST the same day.
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 BST?
British Summer Time is used across the United Kingdom — England, Scotland, Wales, and Northern Ireland — during summer. Major cities include London, Manchester, Birmingham, Edinburgh, and Glasgow. The Republic of Ireland uses Irish Standard Time, which has the same UTC+1 offset during summer.
Pro Tips
- • SST is 12 hours behind BST — exactly half a day and the same calendar day on both sides.
- • American Samoa never observes daylight saving, so any seasonal shift is from the UK side switching between BST and GMT.
- • For live calls, late-evening BST and early-morning SST is the only realistic overlap window.
- • Outside BST (late October to late March) the UK is on GMT (UTC+0) and the gap drops to 11 hours.
- • Recurring meetings drift twice a year unless you re-pin them around the BST/GMT switch.
- • For one-off calls, double-check the IANA zones (Europe/London, Pacific/Pago_Pago) in your calendar tool.