Groton, CT to Rio de Janeiro: time difference
Rio de Janeiro is 1 h ahead of Groton, CT. 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.
Groton, CT 16:47 4:47 PM Rio de Janeiro 17:47 5:47 PM You –:–
16:47 4:47 PM
Eastern Daylight Time · UTC-4
☀️ 07:06 · 🌙 18:01
17:47 5:47 PM
Brasilia Standard Time · UTC-3
☀️ 05:17 · 🌙 18:00
·
+1 h
Rio de Janeiro is 1 h ahead of Groton, CT.
When you, Groton, CT 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
🇺🇸 Groton, CT
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
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇺🇸 Groton, CT | 🇧🇷 Rio de Janeiro |
|---|---|---|
| Local time | 16:47 | 17:47 |
| Local date | Tuesday, October 20, 2026 | Tuesday, October 20, 2026 |
| Time zone | Eastern Daylight Time | Brasilia Standard Time |
| UTC offset | UTC-4 | UTC-3 |
| Offset from Groton, CT | — | +1 h |
| IANA zone | America/New York | America/Sao Paulo |
| Daylight saving | On summer time → UTC-5, Nov 1, 01:00 | Not observed |
| Sunrise | 07:06 | 05:17 |
| Sunset | 18:01 | 18:00 |
| Daylight | 10 h 55 min | 12 h 43 min |
| People on this clock | 40,115 | 6,211,223 |
Compare Groton, CT with another city
More comparisons with Groton, CT: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Groton, CT and Rio de Janeiro: common questions
What is the time difference between Groton, CT, and Rio de Janeiro?
Rio de Janeiro is 1 hour ahead: it uses UTC−3, while Groton is on UTC−4.
If it is 9:00 AM in Groton, CT, what time is it in Rio de Janeiro?
At 9:00 AM in Groton, clocks in Rio de Janeiro show 10:00 AM.
What time is it in Rio de Janeiro when it is 6:00 PM in Groton, CT?
When it is 6:00 PM in Groton, it is 7:00 PM in Rio de Janeiro.
When do working hours in Groton, CT, and in Rio de Janeiro overlap?
Working hours (9:00 AM–6:00 PM) overlap from 9:00 AM to 5:00 PM in Groton, which is 10:00 AM to 6:00 PM in Rio de Janeiro.
From what time in Groton, CT, is it tomorrow in Rio de Janeiro?
Once it is 11:00 PM in Groton, the date in Rio de Janeiro has already changed. Until 1:00 AM in Rio de Janeiro, it is still the previous day in Groton.
Is the time difference between Groton, CT, and Rio de Janeiro the same all year?
No. Only Groton switches to summer time, so the gap changes twice a year. From November 1, 2026, Rio de Janeiro will be 2 hours ahead of Groton.
