Boulder, CO to Buenos Aires: time difference
Buenos Aires is 3 h ahead of Boulder, CO. 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.
Boulder, CO 06:26 6:26 AM Buenos Aires 09:26 9:26 AM You –:–
06:26 6:26 AM
Mountain Daylight Time · UTC-6
☀️ 07:19 · 🌙 18:17
09:26 9:26 AM
Argentina Standard Time · UTC-3
☀️ 06:06 · 🌙 19:12
·
+3 h
Buenos Aires is 3 h ahead of Boulder, CO.
When you, Boulder, CO 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
🇺🇸 Boulder, CO
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
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇺🇸 Boulder, CO | 🇦🇷 Buenos Aires |
|---|---|---|
| Local time | 06:26 | 09:26 |
| Local date | Tuesday, October 20, 2026 | Tuesday, October 20, 2026 |
| Time zone | Mountain Daylight Time | Argentina Standard Time |
| UTC offset | UTC-6 | UTC-3 |
| Offset from Boulder, CO | — | +3 h |
| IANA zone | America/Denver | America/Argentina/Buenos Aires |
| Daylight saving | On summer time → UTC-7, Nov 1, 01:00 | Not observed |
| Sunrise | 07:19 | 06:06 |
| Sunset | 18:17 | 19:12 |
| Daylight | 10 h 58 min | 13 h 6 min |
| People on this clock | 106,803 | 2,891,082 |
Compare Boulder, CO with another city
More comparisons with Boulder, CO: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Boulder, CO and Buenos Aires: common questions
How far ahead of Boulder, CO, is Buenos Aires?
Buenos Aires is 3 hours ahead of Boulder: UTC−3 against UTC−6.
What time is it in Buenos Aires at the start of the working day in Boulder, CO?
The working day in Boulder starts at 9:00 AM; in Buenos Aires it is 12:00 PM at that moment.
If it is 6:00 PM in Boulder, CO, what time is it in Buenos Aires?
At 6:00 PM in Boulder, clocks in Buenos Aires show 9:00 PM.
When is a good time to call Buenos Aires from Boulder, CO?
Between 9:00 AM and 3:00 PM in Boulder – that is 12:00 PM to 6:00 PM in Buenos Aires – both places are within working hours (9:00 AM–6:00 PM).
When is it already the next day in Buenos Aires?
From 9:00 PM in Boulder, CO, 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 Boulder.
Is the time difference between Boulder, CO, and Buenos Aires the same all year?
No. Only Boulder switches to summer time, so the gap changes twice a year. From November 1, 2026, Buenos Aires will be 4 hours ahead of Boulder.
