Helena, MT to Rio de Janeiro: time difference
Rio de Janeiro is 3 h ahead of Helena, MT. Live clocks for both, the working hours they share, and how each one sits against your own time.
+3 h
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Helena, MT 04:43 4:43 AM Rio de Janeiro 07:43 7:43 AM You –:–
04:43 4:43 AM
Mountain Daylight Time · UTC-6
☀️ 07:39 · 🌙 18:52
07:43 7:43 AM
Brasilia Standard Time · UTC-3
☀️ 05:26 · 🌙 17:55
·
+3 h
Rio de Janeiro is 3 h ahead of Helena, MT.
When you, Helena, MT 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
🇺🇸 Helena, MT
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
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 1 1 AM 2 2 AM
📍 Your time
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- Early
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Time zones side by side
| Detail | 🇺🇸 Helena, MT | 🇧🇷 Rio de Janeiro |
|---|---|---|
| Local time | 04:43 | 07:43 |
| Local date | Saturday, October 10, 2026 | Saturday, October 10, 2026 |
| Time zone | Mountain Daylight Time | Brasilia Standard Time |
| UTC offset | UTC-6 | UTC-3 |
| Offset from Helena, MT | — | +3 h |
| IANA zone | America/Denver | America/Sao Paulo |
| Daylight saving | On summer time → UTC-7, Nov 1, 01:00 | Not observed |
| Sunrise | 07:39 | 05:26 |
| Sunset | 18:52 | 17:55 |
| Daylight | 11 h 13 min | 12 h 30 min |
| People on this clock | 32,091 | 6,211,223 |
Compare Helena, MT with another city
More comparisons with Helena, MT: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Helena, MT and Rio de Janeiro: common questions
How many hours ahead of Helena, MT, is Rio de Janeiro?
The clocks in Rio de Janeiro are 3 hours ahead of those in Helena (UTC−3 and UTC−6).
What time is it in Rio de Janeiro at the start of the working day in Helena, MT?
The working day in Helena starts at 9:00 AM; in Rio de Janeiro it is 12:00 PM at that moment.
What time is it in Rio de Janeiro at the end of the working day in Helena, MT?
The working day in Helena ends at 6:00 PM; in Rio de Janeiro it is 9:00 PM at that moment.
When is a good time to call Rio de Janeiro from Helena, MT?
Between 9:00 AM and 3:00 PM in Helena – that is 12:00 PM to 6:00 PM in Rio de Janeiro – both places are within working hours (9:00 AM–6:00 PM).
When is it already the next day in Rio de Janeiro?
From 9:00 PM in Helena, MT, it is already the next day in Rio de Janeiro. The other way round, until 3:00 AM in Rio de Janeiro it is still the previous day in Helena.
Is the time difference between Helena, MT, and Rio de Janeiro the same all year?
No. Only Helena switches to summer time, so the gap changes twice a year. From November 1, 2026, Rio de Janeiro will be 4 hours ahead of Helena.
