Great Falls, MT to Buenos Aires: time difference
Buenos Aires is 3 h ahead of Great Falls, 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.
Great Falls, MT 21:12 9:12 PM Buenos Aires 00:12 12:12 AM You –:–
21:12 9:12 PM
Mountain Daylight Time · UTC-6
☀️ 07:37 · 🌙 18:48
00:12 12:12 AM
Argentina Standard Time · UTC-3
☀️ 06:19 · 🌙 19:04
·
+3 h
Buenos Aires is 3 h ahead of Great Falls, MT.
When you, Great Falls, 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
🇺🇸 Great Falls, 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 | 🇺🇸 Great Falls, MT | 🇦🇷 Buenos Aires |
|---|---|---|
| Local time | 21:12 | 00:12 |
| Local date | Saturday, October 10, 2026 | Sunday, October 11, 2026 |
| Time zone | Mountain Daylight Time | Argentina Standard Time |
| UTC offset | UTC-6 | UTC-3 |
| Offset from Great Falls, 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 | 07:37 | 06:19 |
| Sunset | 18:48 | 19:04 |
| Daylight | 11 h 11 min | 12 h 45 min |
| People on this clock | 60,442 | 2,891,082 |
Compare Great Falls, MT with another city
More comparisons with Great Falls, MT: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Great Falls, MT and Buenos Aires: common questions
How far ahead of Great Falls, MT, is Buenos Aires?
Buenos Aires is 3 hours ahead of Great Falls: UTC−3 against UTC−6.
What time is it in Buenos Aires at the start of the working day in Great Falls, MT?
The working day in Great Falls starts at 9:00 AM; in Buenos Aires it is 12:00 PM at that moment.
What time is it in Buenos Aires at the end of the working day in Great Falls, MT?
The working day in Great Falls ends at 6:00 PM; in Buenos Aires it is 9:00 PM at that moment.
When do working hours in Great Falls, MT, and in Buenos Aires overlap?
Working hours (9:00 AM–6:00 PM) overlap from 9:00 AM to 3:00 PM in Great Falls, 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 Great Falls, 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 Great Falls.
Is the time difference between Great Falls, MT, and Buenos Aires the same all year?
No. Only Great Falls switches to summer time, so the gap changes twice a year. From November 1, 2026, Buenos Aires will be 4 hours ahead of Great Falls.
