Rio de Janeiro to Butte, MT: time difference
Butte, MT is 3 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 11:45 11:45 AM Butte, MT 08:45 8:45 AM You –:–
11:45 11:45 AM
Brasilia Standard Time · UTC-3
☀️ 05:15 · 🌙 18:01
08:45 8:45 AM
Mountain Daylight Time · UTC-6
☀️ 07:57 · 🌙 18:33
·
−3 h
Butte, MT is 3 h behind Rio de Janeiro.
When you, Rio de Janeiro and Butte, MT 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
🇺🇸 Butte, MT
21 9 PM 22 10 PM 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
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇧🇷 Rio de Janeiro | 🇺🇸 Butte, MT |
|---|---|---|
| Local time | 11:45 | 08:45 |
| Local date | Thursday, October 22, 2026 | Thursday, October 22, 2026 |
| Time zone | Brasilia Standard Time | Mountain Daylight Time |
| UTC offset | UTC-3 | UTC-6 |
| Offset from Rio de Janeiro | — | −3 h |
| IANA zone | America/Sao Paulo | America/Denver |
| Daylight saving | Not observed | On summer time → UTC-7, Nov 1, 01:00 |
| Sunrise | 05:15 | 07:57 |
| Sunset | 18:01 | 18:33 |
| Daylight | 12 h 45 min | 10 h 36 min |
| People on this clock | 6,211,223 | 35,000 |
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 Butte, MT: common questions
What is the time difference between Rio de Janeiro and Butte, MT?
Butte is 3 hours behind: it uses UTC−6, while Rio de Janeiro is on UTC−3.
What time is it in Butte, MT, at the start of the working day in Rio de Janeiro?
The working day in Rio de Janeiro starts at 9:00 AM; in Butte it is 6:00 AM at that moment.
What time is it in Butte, MT, when it is 6:00 PM in Rio de Janeiro?
When it is 6:00 PM in Rio de Janeiro, it is 3:00 PM in Butte.
Is there a time when both Rio de Janeiro and Butte, MT, are at work?
Yes: from 12:00 PM to 6:00 PM in Rio de Janeiro (9:00 AM to 3:00 PM in Butte), the working days (9:00 AM–6:00 PM) overlap.
When does the date change in Butte, MT, compared with Rio de Janeiro?
The new day starts in Butte later: until 3:00 AM in Rio de Janeiro, it is still the previous day there. From 9:00 PM in Butte, Rio de Janeiro is already on the next day.
Does the time gap between Rio de Janeiro and Butte, MT, change during the year?
Yes – daylight saving time is used in Butte but not in Rio de Janeiro. From November 1, 2026, Butte will be 4 hours behind Rio de Janeiro.
