IST to BRT Converter & Meeting Planner
Quick answer: 9:00 AM IST = 12:30 AM BRT (fixed +05:30 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Indian Standard Time (IST) and Brasília Time (BRT)? You need to account for the standard time difference. Brasília Time is normally 8.5 hours behind Indian Standard Time. Whether you are coordinating between teams in Mumbai and New Delhi and São Paulo and Rio de Janeiro, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM IST = 3:30 PM BRT. The full 24-hour IST to BRT table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM IST = 6:30 AM BRT.
| IST Time | BRT Time |
|---|---|
| 12:00 AM (00:00) | 3:30 PM (15:30)-1 day |
| 1:00 AM (01:00) | 4:30 PM (16:30)-1 day |
| 2:00 AM (02:00) | 5:30 PM (17:30)-1 day |
| 3:00 AM (03:00) | 6:30 PM (18:30)-1 day |
| 4:00 AM (04:00) | 7:30 PM (19:30)-1 day |
| 5:00 AM (05:00) | 8:30 PM (20:30)-1 day |
| 6:00 AM (06:00) | 9:30 PM (21:30)-1 day |
| 7:00 AM (07:00) | 10:30 PM (22:30)-1 day |
| 8:00 AM (08:00) | 11:30 PM (23:30)-1 day |
| 9:00 AM (09:00) | 12:30 AM (00:30) |
| 10:00 AM (10:00) | 1:30 AM (01:30) |
| 11:00 AM (11:00) | 2:30 AM (02:30) |
| 12:00 PM (12:00) | 3:30 AM (03:30) |
| 1:00 PM (13:00) | 4:30 AM (04:30) |
| 2:00 PM (14:00) | 5:30 AM (05:30) |
| 3:00 PM (15:00) | 6:30 AM (06:30) |
| 4:00 PM (16:00) | 7:30 AM (07:30) |
| 5:00 PM (17:00) | 8:30 AM (08:30) |
| 6:00 PM (18:00) | 9:30 AM (09:30) |
| 7:00 PM (19:00) | 10:30 AM (10:30) |
| 8:00 PM (20:00) | 11:30 AM (11:30) |
| 9:00 PM (21:00) | 12:30 PM (12:30) |
| 10:00 PM (22:00) | 1:30 PM (13:30) |
| 11:00 PM (23:00) | 2:30 PM (14:30) |
Best time to call São Paulo from Mumbai
For most work calls, compare the normal business day in Mumbai (IST) with the business day in São Paulo (BRT). IST commonly covers South Asia, while BRT is mainly associated with South America.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
✅ The most practical overlap on 2026-07-05 is usually 5:30 PM - 6:30 PM IST, which corresponds to 9:00 AM - 10:00 AM BRT. This window sits inside the typical IST workday (9:30 AM - 6:30 PM) and the BRT workday (9:00 AM - 6:00 PM).
- DST Safety: Neither IST nor BRT uses Daylight Saving Time in our dataset, making business-hour relationships stable year-round.
- Bombay Stock Exchange (BSE): 09:15-15:30 local time in Mumbai.
- B3 (Brasil Bolsa Balcão): 10:00-17:00 local time in São Paulo.
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Frequently Asked Questions
What is the time difference between IST and BRT?
During standard time, Brasília Time is 8.5 hours behind Indian Standard Time.
Does India observe Daylight Saving Time (DST)?
India does not observe Daylight Saving Time and has not done so since 1945. IST remains fixed at UTC+5:30 every day of the year, meaning the offset between India and any DST-observing country shifts by one hour twice annually when those countries change their clocks.
Why does IST have a 30-minute offset?
India chose the 82.5° East meridian — which passes through Mirzapur in Uttar Pradesh — as its central reference longitude, as it bisects the subcontinent geographically. That meridian sits exactly 5 hours and 30 minutes ahead of the Prime Meridian in Greenwich, producing the UTC+5:30 offset that has defined IST since 1906.
Does Brazil observe Daylight Saving Time?
Brazil officially abolished Daylight Saving Time by presidential decree in April 2019, ending a practice that had been observed in the country's southeastern states since 1985. BRT has remained fixed at UTC-3:00 every day of the year since then, meaning the B3 stock exchange, federal government, and all Brazilian commercial operations run on a permanent, unchanging offset.
Is BRT the same as Argentina Time (ART)?
BRT (Brasília Time) and ART (Argentina Time) share the identical UTC-3:00 offset and neither country observes Daylight Saving Time, making São Paulo and Buenos Aires permanently synchronized on the same clock. Despite the different official designations, a meeting set for 10:00 BRT in São Paulo falls at exactly 10:00 ART in Buenos Aires — a fixed relationship that never shifts seasonally.