Rio de Janeiro to Waltham, MA: time difference
Waltham, 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 11:13 11:13 AM Waltham, MA 10:13 10:13 AM You –:–
11:13 11:13 AM
Brasilia Standard Time · UTC-3
☀️ 05:19 · 🌙 17:59
10:13 10:13 AM
Eastern Daylight Time · UTC-4
☀️ 07:02 · 🌙 18:00
·
−1 h
Waltham, MA is 1 h behind Rio de Janeiro.
When you, Rio de Janeiro and Waltham, 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
🇺🇸 Waltham, 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 | 🇺🇸 Waltham, MA |
|---|---|---|
| Local time | 11:13 | 10:13 |
| 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 | 07:02 |
| Sunset | 17:59 | 18:00 |
| Daylight | 12 h 40 min | 10 h 58 min |
| People on this clock | 6,211,223 | 60,636 |
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 Waltham, MA: common questions
How many hours behind Rio de Janeiro is Waltham, MA?
The clocks in Waltham are 1 hour behind those in Rio de Janeiro (UTC−4 and UTC−3).
What time is it in Waltham, MA, at the start of the working day in Rio de Janeiro?
The working day in Rio de Janeiro starts at 9:00 AM; in Waltham it is 8:00 AM at that moment.
What time is it in Waltham, MA, at the end of the working day in Rio de Janeiro?
The working day in Rio de Janeiro ends at 6:00 PM; in Waltham it is 5:00 PM at that moment.
Is there a time when both Rio de Janeiro and Waltham, 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 Waltham), the working days (9:00 AM–6:00 PM) overlap.
When does the date change in Waltham, MA, compared with Rio de Janeiro?
The new day starts in Waltham later: until 1:00 AM in Rio de Janeiro, it is still the previous day there. From 11:00 PM in Waltham, Rio de Janeiro is already on the next day.
Does the time difference between Rio de Janeiro and Waltham, MA, change?
Yes. The clocks change only in Waltham. From November 1, 2026, Waltham will be 2 hours behind Rio de Janeiro.
