Buenos Aires to Longmont, CO: time difference
Longmont, CO 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 14:35 2:35 PM Longmont, CO 11:35 11:35 AM You –:–
14:35 2:35 PM
Argentina Standard Time · UTC-3
☀️ 06:07 · 🌙 19:11
11:35 11:35 AM
Mountain Daylight Time · UTC-6
☀️ 07:16 · 🌙 18:16
·
−3 h
Longmont, CO is 3 h behind Buenos Aires.
When you, Buenos Aires and Longmont, CO 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
🇺🇸 Longmont, CO
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 | 🇺🇸 Longmont, CO |
|---|---|---|
| Local time | 14:35 | 11:35 |
| Local date | Monday, October 19, 2026 | Monday, October 19, 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 | 06:07 | 07:16 |
| Sunset | 19:11 | 18:16 |
| Daylight | 13 h 4 min | 11 h |
| People on this clock | 2,891,082 | 94,341 |
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 Longmont, CO: common questions
How many hours behind Buenos Aires is Longmont, CO?
The clocks in Longmont are 3 hours behind those in Buenos Aires (UTC−6 and UTC−3).
If it is 9:00 AM in Buenos Aires, what time is it in Longmont, CO?
At 9:00 AM in Buenos Aires, clocks in Longmont show 6:00 AM.
What time is it in Longmont, CO, at the end of the working day in Buenos Aires?
The working day in Buenos Aires ends at 6:00 PM; in Longmont it is 3:00 PM at that moment.
When do working hours in Buenos Aires and in Longmont, CO, overlap?
Working hours (9:00 AM–6:00 PM) overlap from 12:00 PM to 6:00 PM in Buenos Aires, which is 9:00 AM to 3:00 PM in Longmont.
When does the date change in Longmont, CO, compared with Buenos Aires?
The new day starts in Longmont later: until 3:00 AM in Buenos Aires, it is still the previous day there. From 9:00 PM in Longmont, Buenos Aires is already on the next day.
Does the time gap between Buenos Aires and Longmont, CO, change during the year?
Yes – daylight saving time is used in Longmont but not in Buenos Aires. From November 1, 2026, Longmont will be 4 hours behind Buenos Aires.
