Somerville, MA to Rio de Janeiro: time difference
Rio de Janeiro is 1 h ahead of Somerville, 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.
Somerville, MA 10:06 10:06 AM Rio de Janeiro 11:06 11:06 AM You –:–
10:06 10:06 AM
Eastern Daylight Time · UTC-4
☀️ 07:01 · 🌙 17:59
11:06 11:06 AM
Brasilia Standard Time · UTC-3
☀️ 05:19 · 🌙 17:59
·
+1 h
Rio de Janeiro is 1 h ahead of Somerville, MA.
When you, Somerville, 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
🇺🇸 Somerville, 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 | 🇺🇸 Somerville, MA | 🇧🇷 Rio de Janeiro |
|---|---|---|
| Local time | 10:06 | 11:06 |
| Local date | Sunday, October 18, 2026 | Sunday, October 18, 2026 |
| Time zone | Eastern Daylight Time | Brasilia Standard Time |
| UTC offset | UTC-4 | UTC-3 |
| Offset from Somerville, 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 | 07:01 | 05:19 |
| Sunset | 17:59 | 17:59 |
| Daylight | 10 h 58 min | 12 h 40 min |
| People on this clock | 75,754 | 6,211,223 |
Compare Somerville, MA with another city
More comparisons with Somerville, MA: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Somerville, MA and Rio de Janeiro: common questions
How many hours ahead of Somerville, MA, is Rio de Janeiro?
The clocks in Rio de Janeiro are 1 hour ahead of those in Somerville (UTC−3 and UTC−4).
What time is it in Rio de Janeiro at the start of the working day in Somerville, MA?
The working day in Somerville starts at 9:00 AM; in Rio de Janeiro it is 10:00 AM at that moment.
What time is it in Rio de Janeiro at the end of the working day in Somerville, MA?
The working day in Somerville ends at 6:00 PM; in Rio de Janeiro it is 7:00 PM at that moment.
When do working hours in Somerville, 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 Somerville, which is 10:00 AM to 6:00 PM in Rio de Janeiro.
When does the date change in Rio de Janeiro compared with Somerville, MA?
The new day starts in Rio de Janeiro earlier: at 11:00 PM in Somerville it is already midnight there. Until 1:00 AM in Rio de Janeiro, Somerville is still on the previous day.
Does the time difference between Somerville, MA, and Rio de Janeiro change?
Yes. The clocks change only in Somerville. From November 1, 2026, Rio de Janeiro will be 2 hours ahead of Somerville.
