IST to SST Converter
Convert time between India Standard Time (IST) and Samoa Standard Time (SST)
India Standard Time (IST)
Samoa Standard Time (SST)
Time Difference
Samoa Standard Time (SST) is 0 hours ahead of India Standard Time (IST)
Select Date
Select Time
Quick Reference
| IST | SST |
|---|---|
| 07:30 | 15:00 |
| 09:30 | 17:00 |
| 11:30 | 19:00 |
| 13:30 | 21:00 |
| 15:30 | 23:00 |
| 17:30 | 01:00 |
| 19:30 | 03:00 |
| 21:30 | 05:00 |
| 23:30 | 07:00 |
| 01:30 | 09:00 |
| 03:30 | 11:00 |
| 05:30 | 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 IST to SST Time Conversion
Converting time between India Standard Time (IST) and Samoa Standard Time (SST) bridges the Indian subcontinent and the South Pacific. IST is UTC+5:30 and SST is UTC-11, making SST 16.5 hours behind IST. Both timezones are stable year-round — India has not used DST since 1945 and American Samoa never observes daylight saving — so the half-hour offset is identical every day of the year.
IST in this converter refers to India Standard Time (Asia/Kolkata), not Israel Standard Time which uses the same abbreviation but a different offset. Whether you're booking a call between Mumbai or Bangalore and Pago Pago, coordinating with Pacific-based teams from Indian offices, or planning travel across the date line, the tool handles the half-hour offset and the date-line crossing without manual arithmetic.
Common Use Cases for IST to SST Conversion
Business & Work
- Scheduling video calls between Mumbai, Bangalore, or Delhi and American Samoa
- Coordinating India–Pacific remote team handoffs and project work
- Planning conference calls that bridge Indian and Samoan working hours
Personal & Travel
- Calling family in American Samoa from India
- Planning travel itineraries connecting through India to the Pacific
- Coordinating live cricket and other Indian event watch parties
Time Zone Information
India Standard Time (IST)
- UTC Offset: UTC+5:30
- IANA Timezone: Asia/Kolkata
- Daylight Saving: None - India does not observe daylight saving time
- Major Cities: Mumbai, Delhi, Bangalore, Chennai, Kolkata
- Coverage: India and Sri Lanka
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: IST to SST
Remember: SST is 16.5 hours behind IST year-round. Refers to India Standard Time, not Israel Standard Time.
Frequently Asked Questions
What is the time difference between IST and SST?
India Standard Time (IST) is UTC+5:30, while Samoa Standard Time (SST) is UTC-11. SST is 16.5 hours behind IST. When it is 12:00 PM in Mumbai, it is 7:30 PM the previous day in Pago Pago. IST here refers to India Standard Time, not Israel Standard Time.
When does this IST to SST conversion apply?
It applies year-round. India has not used DST since 1945, and American Samoa never observes daylight saving, so the 16.5-hour offset is stable in every month of the year.
How does the time difference change throughout the year?
It does not change. IST stays on UTC+5:30 and SST stays on UTC-11 year-round. The half-hour offset and date-line crossing make this conversion unusual but predictable.
What are the best times for IST–SST business calls?
A 16.5-hour gap with the date line in between leaves only a thin overlap window. Late evening IST (9:00–11:00 PM in Mumbai) maps to 4:30–6:30 AM the same day in Pago Pago — late on one side, very early on the other.
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 IST?
India Standard Time covers India and Sri Lanka. Major cities include Mumbai, Delhi, Bangalore, Chennai, and Kolkata. Note: IST is also used as the abbreviation for Israel Standard Time (UTC+2) and Irish Standard Time (UTC+1) — this converter uses India Standard Time (Asia/Kolkata).
Pro Tips
- • SST is always 16.5 hours behind IST — no DST on either side, so the offset is rock-solid year-round.
- • IST uses a half-hour offset (UTC+5:30) — when SST is at the top of the hour, IST is at the half hour.
- • Late evening IST and early morning SST is the most workable overlap window for live calls.
- • Asynchronous handoffs work well: end-of-day in Mumbai lands at the start of the previous calendar day in Pago Pago.
- • IST is ambiguous — it can mean India, Israel, or Irish Standard Time. This converter uses India Standard Time (Asia/Kolkata).
- • For one-off calls, double-check the IANA zones (Asia/Kolkata, Pacific/Pago_Pago) in your calendar tool.