Helena, MT to Buenos Aires: time difference
Buenos Aires 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 19:45 7:45 PM Buenos Aires 22:45 10:45 PM You –:–
19:45 7:45 PM
Mountain Daylight Time · UTC-6
☀️ 07:38 · 🌙 18:54
22:45 10:45 PM
Argentina Standard Time · UTC-3
☀️ 06:20 · 🌙 19:03
·
+3 h
Buenos Aires is 3 h ahead of Helena, MT.
When you, Helena, MT and Buenos Aires 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
🇦🇷 Buenos Aires
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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Time zones side by side
| Detail | 🇺🇸 Helena, MT | 🇦🇷 Buenos Aires |
|---|---|---|
| Local time | 19:45 | 22:45 |
| Local date | Friday, October 9, 2026 | Friday, October 9, 2026 |
| Time zone | Mountain Daylight Time | Argentina Standard Time |
| UTC offset | UTC-6 | UTC-3 |
| Offset from Helena, MT | — | +3 h |
| IANA zone | America/Denver | America/Argentina/Buenos Aires |
| Daylight saving | On summer time → UTC-7, Nov 1, 01:00 | Not observed |
| Sunrise | 07:38 | 06:20 |
| Sunset | 18:54 | 19:03 |
| Daylight | 11 h 16 min | 12 h 43 min |
| People on this clock | 32,091 | 2,891,082 |
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 Buenos Aires: common questions
How many hours ahead of Helena, MT, is Buenos Aires?
The clocks in Buenos Aires are 3 hours ahead of those in Helena (UTC−3 and UTC−6).
If it is 9:00 AM in Helena, MT, what time is it in Buenos Aires?
At 9:00 AM in Helena, clocks in Buenos Aires show 12:00 PM.
What time is it in Buenos Aires when it is 6:00 PM in Helena, MT?
When it is 6:00 PM in Helena, it is 9:00 PM in Buenos Aires.
When do working hours in Helena, MT, and in Buenos Aires overlap?
Working hours (9:00 AM–6:00 PM) overlap from 9:00 AM to 3:00 PM in Helena, which is 12:00 PM to 6:00 PM in Buenos Aires.
When is it already the next day in Buenos Aires?
From 9:00 PM in Helena, MT, it is already the next day in Buenos Aires. The other way round, until 3:00 AM in Buenos Aires it is still the previous day in Helena.
Is the time difference between Helena, MT, and Buenos Aires the same all year?
No. Only Helena switches to summer time, so the gap changes twice a year. From November 1, 2026, Buenos Aires will be 4 hours ahead of Helena.
