Rio de Janeiro to Boston, MA: time difference
Boston, MA is 1 h behind Rio de Janeiro. Live clocks for both, the working hours they share, and how each one sits against your own time.
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Rio de Janeiro 09:23 9:23 AM Boston, MA 08:23 8:23 AM You –:–
09:23 9:23 AM
Brasilia Standard Time · UTC-3
☀️ 05:26 · 🌙 17:55
08:23 8:23 AM
Eastern Daylight Time · UTC-4
☀️ 06:52 · 🌙 18:12
·
−1 h
Boston, MA is 1 h behind Rio de Janeiro.
When you, Rio de Janeiro and Boston, MA are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇧🇷 Rio de Janeiro
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
🇺🇸 Boston, MA
23 11 PM 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
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇧🇷 Rio de Janeiro | 🇺🇸 Boston, MA |
|---|---|---|
| Local time | 09:23 | 08:23 |
| Local date | Saturday, October 10, 2026 | Saturday, October 10, 2026 |
| Time zone | Brasilia Standard Time | Eastern Daylight Time |
| UTC offset | UTC-3 | UTC-4 |
| Offset from Rio de Janeiro | — | −1 h |
| IANA zone | America/Sao Paulo | America/New York |
| Daylight saving | Not observed | On summer time → UTC-5, Nov 1, 01:00 |
| Sunrise | 05:26 | 06:52 |
| Sunset | 17:55 | 18:12 |
| Daylight | 12 h 30 min | 11 h 20 min |
| People on this clock | 6,211,223 | 675,647 |
Compare Rio de Janeiro with another city
More comparisons with Rio de Janeiro: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Rio de Janeiro and Boston, MA: common questions
What is the time difference between Rio de Janeiro and Boston, MA?
Boston is 1 hour behind: it uses UTC−4, while Rio de Janeiro is on UTC−3.
What time is it in Boston, MA, when it is 9:00 AM in Rio de Janeiro?
When it is 9:00 AM in Rio de Janeiro, it is 8:00 AM in Boston.
What time is it in Boston, MA, when it is 6:00 PM in Rio de Janeiro?
When it is 6:00 PM in Rio de Janeiro, it is 5:00 PM in Boston.
When do working hours in Rio de Janeiro and in Boston, MA, overlap?
Working hours (9:00 AM–6:00 PM) overlap from 10:00 AM to 6:00 PM in Rio de Janeiro, which is 9:00 AM to 5:00 PM in Boston.
When does the date change in Boston, MA, compared with Rio de Janeiro?
The new day starts in Boston later: until 1:00 AM in Rio de Janeiro, it is still the previous day there. From 11:00 PM in Boston, Rio de Janeiro is already on the next day.
Does the time difference between Rio de Janeiro and Boston, MA, change?
Yes. The clocks change only in Boston. From November 1, 2026, Boston will be 2 hours behind Rio de Janeiro.
