Buenos Aires to Helena, MT: time difference
Helena, MT is 3 h behind Buenos Aires. 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.
Buenos Aires 23:41 11:41 PM Helena, MT 20:41 8:41 PM You –:–
23:41 11:41 PM
Argentina Standard Time · UTC-3
☀️ 06:20 · 🌙 19:03
20:41 8:41 PM
Mountain Daylight Time · UTC-6
☀️ 07:38 · 🌙 18:54
·
−3 h
Helena, MT is 3 h behind Buenos Aires.
When you, Buenos Aires 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
🇦🇷 Buenos Aires
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 | 🇦🇷 Buenos Aires | 🇺🇸 Helena, MT |
|---|---|---|
| Local time | 23:41 | 20:41 |
| Local date | Friday, October 9, 2026 | Friday, October 9, 2026 |
| Time zone | Argentina Standard Time | Mountain Daylight Time |
| UTC offset | UTC-3 | UTC-6 |
| Offset from Buenos Aires | — | −3 h |
| IANA zone | America/Argentina/Buenos Aires | America/Denver |
| Daylight saving | Not observed | On summer time → UTC-7, Nov 1, 01:00 |
| Sunrise | 06:20 | 07:38 |
| Sunset | 19:03 | 18:54 |
| Daylight | 12 h 43 min | 11 h 16 min |
| People on this clock | 2,891,082 | 32,091 |
Compare Buenos Aires with another city
More comparisons with Buenos Aires: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Buenos Aires and Helena, MT: common questions
How far behind Buenos Aires is Helena, MT?
Helena is 3 hours behind Buenos Aires: UTC−6 against UTC−3.
If it is 9:00 AM in Buenos Aires, what time is it in Helena, MT?
At 9:00 AM in Buenos Aires, clocks in Helena show 6:00 AM.
If it is 6:00 PM in Buenos Aires, what time is it in Helena, MT?
At 6:00 PM in Buenos Aires, clocks in Helena show 3:00 PM.
When is a good time to call Helena, MT, from Buenos Aires?
Between 12:00 PM and 6:00 PM in Buenos Aires – that is 9:00 AM to 3:00 PM in Helena – both places are within working hours (9:00 AM–6:00 PM).
Until what time in Buenos Aires is it still yesterday in Helena, MT?
Before 3:00 AM in Buenos Aires, the date in Helena has not changed yet. From 9:00 PM in Helena, it is already the next day in Buenos Aires.
Does the time gap between Buenos Aires and Helena, MT, change during the year?
Yes – daylight saving time is used in Helena but not in Buenos Aires. From November 1, 2026, Helena will be 4 hours behind Buenos Aires.
