Rio de Janeiro to Helena, MT: time difference
Helena, 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 11:04 11:04 AM Helena, MT 08:04 8:04 AM You –:–
11:04 11:04 AM
Brasilia Standard Time · UTC-3
☀️ 05:26 · 🌙 17:55
08:04 8:04 AM
Mountain Daylight Time · UTC-6
☀️ 07:39 · 🌙 18:52
·
−3 h
Helena, MT is 3 h behind Rio de Janeiro.
When you, Rio de Janeiro and Helena, 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
🇺🇸 Helena, 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 | 🇺🇸 Helena, MT |
|---|---|---|
| Local time | 11:04 | 08:04 |
| Local date | Saturday, October 10, 2026 | Saturday, October 10, 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 | 05:26 | 07:39 |
| Sunset | 17:55 | 18:52 |
| Daylight | 12 h 30 min | 11 h 13 min |
| People on this clock | 6,211,223 | 32,091 |
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 Helena, MT: common questions
What is the time difference between Rio de Janeiro and Helena, MT?
Helena is 3 hours behind: it uses UTC−6, while Rio de Janeiro is on UTC−3.
What time is it in Helena, MT, when it is 9:00 AM in Rio de Janeiro?
When it is 9:00 AM in Rio de Janeiro, it is 6:00 AM in Helena.
If it is 6:00 PM in Rio de Janeiro, what time is it in Helena, MT?
At 6:00 PM in Rio de Janeiro, clocks in Helena show 3:00 PM.
When do working hours in Rio de Janeiro and in Helena, MT, overlap?
Working hours (9:00 AM–6:00 PM) overlap from 12:00 PM to 6:00 PM in Rio de Janeiro, which is 9:00 AM to 3:00 PM in Helena.
When does the date change in Helena, MT, compared with Rio de Janeiro?
The new day starts in Helena later: until 3:00 AM in Rio de Janeiro, it is still the previous day there. From 9:00 PM in Helena, Rio de Janeiro is already on the next day.
Is the time difference between Rio de Janeiro and Helena, MT, the same all year?
No. Only Helena switches to summer time, so the gap changes twice a year. From November 1, 2026, Helena will be 4 hours behind Rio de Janeiro.
