Acton, MA to Rio de Janeiro: time difference
Rio de Janeiro is 1 h ahead of Acton, 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.
Acton, MA 07:30 7:30 AM Rio de Janeiro 08:30 8:30 AM You –:–
07:30 7:30 AM
Eastern Daylight Time · UTC-4
☀️ 06:53 · 🌙 18:13
08:30 8:30 AM
Brasilia Standard Time · UTC-3
☀️ 05:26 · 🌙 17:55
·
+1 h
Rio de Janeiro is 1 h ahead of Acton, MA.
When you, Acton, 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
🇺🇸 Acton, 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
- Asleep
- Early
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Time zones side by side
| Detail | 🇺🇸 Acton, MA | 🇧🇷 Rio de Janeiro |
|---|---|---|
| Local time | 07:30 | 08:30 |
| 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 Acton, 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 | 06:53 | 05:26 |
| Sunset | 18:13 | 17:55 |
| Daylight | 11 h 20 min | 12 h 30 min |
| People on this clock | 7,596 | 6,211,223 |
Compare Acton, MA with another city
More comparisons with Acton, MA: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Acton, MA and Rio de Janeiro: common questions
How many hours ahead of Acton, MA, is Rio de Janeiro?
The clocks in Rio de Janeiro are 1 hour ahead of those in Acton (UTC−3 and UTC−4).
What time is it in Rio de Janeiro when it is 9:00 AM in Acton, MA?
When it is 9:00 AM in Acton, it is 10:00 AM in Rio de Janeiro.
What time is it in Rio de Janeiro when it is 6:00 PM in Acton, MA?
When it is 6:00 PM in Acton, it is 7:00 PM in Rio de Janeiro.
Is there a time when both Acton, MA, and Rio de Janeiro are at work?
Yes: from 9:00 AM to 5:00 PM in Acton (10:00 AM to 6:00 PM in Rio de Janeiro), the working days (9:00 AM–6:00 PM) overlap.
From what time in Acton, MA, is it tomorrow in Rio de Janeiro?
Once it is 11:00 PM in Acton, the date in Rio de Janeiro has already changed. Until 1:00 AM in Rio de Janeiro, it is still the previous day in Acton.
Is the time difference between Acton, MA, and Rio de Janeiro the same all year?
No. Only Acton switches to summer time, so the gap changes twice a year. From November 1, 2026, Rio de Janeiro will be 2 hours ahead of Acton.
