SST to JST Converter
Convert time between Samoa Standard Time (SST) and Japan Standard Time (JST)
Samoa Standard Time (SST)
Japan Standard Time (JST)
Time Difference
Japan Standard Time (JST) is 0 hours ahead of Samoa Standard Time (SST)
Select Date
Select Time
Quick Reference
| SST | JST |
|---|---|
| 15:00 | 11:00 |
| 17:00 | 13:00 |
| 19:00 | 15:00 |
| 21:00 | 17:00 |
| 23:00 | 19:00 |
| 01:00 | 21:00 |
| 03:00 | 23:00 |
| 05:00 | 01:00 |
| 07:00 | 03:00 |
| 09:00 | 05:00 |
| 11:00 | 07:00 |
| 13:00 | 09:00 |
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 JST Time Conversion
Converting time between Samoa Standard Time (SST) and Japan Standard Time (JST) bridges the South Pacific and East Asia. SST is UTC-11 and JST is UTC+9, making JST 20 hours ahead of SST. Both timezones are stable year-round — American Samoa never observes daylight saving and Japan has not used DST since the early 1950s — so the 20-hour offset is identical every day of the year, with the international date line in between.
This converter uses the IANA timezone database (Asia/Tokyo) to give accurate results. Whether you're booking a call between Pago Pago and Tokyo or Osaka, coordinating with Japanese teams, or planning travel via Japan, the tool removes the manual offset arithmetic for what is effectively a near-full-day shift.
Common Use Cases for SST to JST Conversion
Business & Work
- Scheduling video calls between American Samoa and Tokyo, Osaka, or Yokohama
- Coordinating Pacific–Japan logistics, fisheries, and maritime operations
- Planning conference calls that bridge Samoan and Japanese working hours
Personal & Travel
- Calling family in Japan from American Samoa
- Planning travel itineraries connecting through Tokyo
- Watching live NPB baseball, J-League, or anime broadcasts
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
Japan Standard Time (JST)
- UTC Offset: UTC+9
- IANA Timezone: Asia/Tokyo
- Daylight Saving: None - Japan does not observe daylight saving time
- Major Cities: Tokyo, Osaka, Yokohama, Nagoya, Sapporo
- Coverage: Japan
Quick Reference: SST to JST
Remember: JST is always 20 hours ahead of SST. Neither side observes daylight saving, so the offset is stable year-round.
Frequently Asked Questions
What is the time difference between SST and JST?
Samoa Standard Time (SST) is UTC-11, while Japan Standard Time (JST) is UTC+9. JST is 20 hours ahead of SST. When it is 12:00 PM in Pago Pago, it is 8:00 AM the next day in Tokyo.
When does this SST to JST conversion apply?
It applies year-round. Neither side observes daylight saving — American Samoa never has, and Japan has not used DST since the early 1950s. The 20-hour offset is identical every day of the year.
How does the time difference change throughout the year?
It does not. Both SST and JST are fixed offsets with no daylight saving, so the gap stays at exactly 20 hours regardless of season. That makes recurring meetings between American Samoa and Japan easier to maintain.
What are the best times for SST–JST business calls?
The 20-hour offset is effectively a near-full-day shift — Pago Pago afternoon aligns with Japanese morning. For example, 3:00–5:00 PM SST is 11:00 AM–1:00 PM JST the next day, comfortable for Tokyo midday.
Which countries and regions use JST?
Japan Standard Time is used across Japan, including Tokyo, Osaka, Yokohama, Nagoya, and Sapporo. JST has the same UTC+9 offset as Korea Standard Time (KST) but is a separate timezone identifier.
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
- • JST is always 20 hours ahead of SST — neither side observes DST, so the offset is stable year-round.
- • Recurring SST↔JST meetings hold their times all year, unlike most US-side conversions.
- • Pago Pago afternoon aligns with Tokyo morning next day — a workable overlap for live calls.
- • Always include the date when scheduling SST↔JST meetings; the conversion always crosses midnight.
- • JST and KST have the same offset (UTC+9) but are separate timezones — use the right one for your contact.
- • For one-off calls, double-check the IANA zones (Pacific/Pago_Pago, Asia/Tokyo) in your calendar tool.