Cambridge to Rio de Janeiro: time difference
Rio de Janeiro is 1 h ahead of Cambridge. 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.
Cambridge 17:51 5:51 PM Rio de Janeiro 18:51 6:51 PM You –:–
17:51 5:51 PM
Eastern Daylight Time · UTC-4
☀️ 07:40 · 🌙 18:33
18:51 6:51 PM
Brasilia Standard Time · UTC-3
☀️ 05:18 · 🌙 17:59
·
+1 h
Rio de Janeiro is 1 h ahead of Cambridge.
When you, Cambridge 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
🇨🇦 Cambridge
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 | 🇨🇦 Cambridge | 🇧🇷 Rio de Janeiro |
|---|---|---|
| Local time | 17:51 | 18:51 |
| Local date | Monday, October 19, 2026 | Monday, October 19, 2026 |
| Time zone | Eastern Daylight Time | Brasilia Standard Time |
| UTC offset | UTC-4 | UTC-3 |
| Offset from Cambridge | — | +1 h |
| IANA zone | America/Toronto | America/Sao Paulo |
| Daylight saving | On summer time → UTC-5, Nov 1, 01:00 | Not observed |
| Sunrise | 07:40 | 05:18 |
| Sunset | 18:33 | 17:59 |
| Daylight | 10 h 53 min | 12 h 41 min |
| People on this clock | 138,479 | 6,211,223 |
Compare Cambridge with another city
More comparisons with Cambridge: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Cambridge and Rio de Janeiro: common questions
What is the time difference between Cambridge and Rio de Janeiro?
Rio de Janeiro is 1 hour ahead: it uses UTC−3, while Cambridge is on UTC−4.
If it is 9:00 AM in Cambridge, what time is it in Rio de Janeiro?
At 9:00 AM in Cambridge, clocks in Rio de Janeiro show 10:00 AM.
If it is 6:00 PM in Cambridge, what time is it in Rio de Janeiro?
At 6:00 PM in Cambridge, clocks in Rio de Janeiro show 7:00 PM.
Is there a time when both Cambridge and Rio de Janeiro are at work?
Yes: from 9:00 AM to 5:00 PM in Cambridge (10:00 AM to 6:00 PM in Rio de Janeiro), the working days (9:00 AM–6:00 PM) overlap.
When is it already the next day in Rio de Janeiro?
From 11:00 PM in Cambridge it is already the next day in Rio de Janeiro. The other way round, until 1:00 AM in Rio de Janeiro it is still the previous day in Cambridge.
Is the time difference between Cambridge and Rio de Janeiro the same all year?
No. Only Cambridge switches to summer time, so the gap changes twice a year. From November 1, 2026, Rio de Janeiro will be 2 hours ahead of Cambridge.
