Rio de Janeiro to Somerville, MA: time difference
Somerville, 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 13:52 1:52 PM Somerville, MA 12:52 12:52 PM You –:–
13:52 1:52 PM
Brasilia Standard Time · UTC-3
☀️ 05:19 · 🌙 17:59
12:52 12:52 PM
Eastern Daylight Time · UTC-4
☀️ 07:01 · 🌙 17:59
·
−1 h
Somerville, MA is 1 h behind Rio de Janeiro.
When you, Rio de Janeiro and Somerville, 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
🇺🇸 Somerville, 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 | 🇺🇸 Somerville, MA |
|---|---|---|
| Local time | 13:52 | 12:52 |
| Local date | Sunday, October 18, 2026 | Sunday, October 18, 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 | 05:19 | 07:01 |
| Sunset | 17:59 | 17:59 |
| Daylight | 12 h 40 min | 10 h 58 min |
| People on this clock | 6,211,223 | 75,754 |
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 Somerville, MA: common questions
What is the time difference between Rio de Janeiro and Somerville, MA?
Somerville is 1 hour behind: it uses UTC−4, while Rio de Janeiro is on UTC−3.
If it is 9:00 AM in Rio de Janeiro, what time is it in Somerville, MA?
At 9:00 AM in Rio de Janeiro, clocks in Somerville show 8:00 AM.
If it is 6:00 PM in Rio de Janeiro, what time is it in Somerville, MA?
At 6:00 PM in Rio de Janeiro, clocks in Somerville show 5:00 PM.
Is there a time when both Rio de Janeiro and Somerville, MA, are at work?
Yes: from 10:00 AM to 6:00 PM in Rio de Janeiro (9:00 AM to 5:00 PM in Somerville), the working days (9:00 AM–6:00 PM) overlap.
When does the date change in Somerville, MA, compared with Rio de Janeiro?
The new day starts in Somerville later: until 1:00 AM in Rio de Janeiro, it is still the previous day there. From 11:00 PM in Somerville, Rio de Janeiro is already on the next day.
Does the time gap between Rio de Janeiro and Somerville, MA, change during the year?
Yes – daylight saving time is used in Somerville but not in Rio de Janeiro. From November 1, 2026, Somerville will be 2 hours behind Rio de Janeiro.
