Boston, MA to Rio de Janeiro: time difference
Rio de Janeiro is 1 h ahead of Boston, MA. Live clocks for both, the working hours they share, and how each one sits against your own time.
+1 h
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Boston, MA 01:49 1:49 AM Rio de Janeiro 02:49 2:49 AM You –:–
01:49 1:49 AM
Eastern Daylight Time · UTC-4
☀️ 06:52 · 🌙 18:12
02:49 2:49 AM
Brasilia Standard Time · UTC-3
☀️ 05:26 · 🌙 17:55
·
+1 h
Rio de Janeiro is 1 h ahead of Boston, MA.
When you, Boston, MA and Rio de Janeiro are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇺🇸 Boston, MA
0 12 AM 1 1 AM 2 2 AM 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM 11 11 AM 12 12 PM 13 1 PM 14 2 PM 15 3 PM 16 4 PM 17 5 PM 18 6 PM 19 7 PM 20 8 PM 21 9 PM 22 10 PM 23 11 PM
🇧🇷 Rio de Janeiro
1 1 AM 2 2 AM 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM 11 11 AM 12 12 PM 13 1 PM 14 2 PM 15 3 PM 16 4 PM 17 5 PM 18 6 PM 19 7 PM 20 8 PM 21 9 PM 22 10 PM 23 11 PM 0 12 AM
📍 Your time
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Time zones side by side
| Detail | 🇺🇸 Boston, MA | 🇧🇷 Rio de Janeiro |
|---|---|---|
| Local time | 01:49 | 02:49 |
| Local date | Saturday, October 10, 2026 | Saturday, October 10, 2026 |
| Time zone | Eastern Daylight Time | Brasilia Standard Time |
| UTC offset | UTC-4 | UTC-3 |
| Offset from Boston, MA | — | +1 h |
| IANA zone | America/New York | America/Sao Paulo |
| Daylight saving | On summer time → UTC-5, Nov 1, 01:00 | Not observed |
| Sunrise | 06:52 | 05:26 |
| Sunset | 18:12 | 17:55 |
| Daylight | 11 h 20 min | 12 h 30 min |
| People on this clock | 675,647 | 6,211,223 |
Compare Boston, MA with another city
More comparisons with Boston, MA: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Boston, MA and Rio de Janeiro: common questions
What is the time difference between Boston, MA, and Rio de Janeiro?
Rio de Janeiro is 1 hour ahead: it uses UTC−3, while Boston is on UTC−4.
If it is 9:00 AM in Boston, MA, what time is it in Rio de Janeiro?
At 9:00 AM in Boston, clocks in Rio de Janeiro show 10:00 AM.
What time is it in Rio de Janeiro when it is 6:00 PM in Boston, MA?
When it is 6:00 PM in Boston, it is 7:00 PM in Rio de Janeiro.
When do working hours in Boston, MA, and in Rio de Janeiro overlap?
Working hours (9:00 AM–6:00 PM) overlap from 9:00 AM to 5:00 PM in Boston, which is 10:00 AM to 6:00 PM in Rio de Janeiro.
When does the date change in Rio de Janeiro compared with Boston, MA?
The new day starts in Rio de Janeiro earlier: at 11:00 PM in Boston it is already midnight there. Until 1:00 AM in Rio de Janeiro, Boston is still on the previous day.
Is the time difference between Boston, MA, and Rio de Janeiro the same all year?
No. Only Boston switches to summer time, so the gap changes twice a year. From November 1, 2026, Rio de Janeiro will be 2 hours ahead of Boston.
