Buenos Aires to Casper, WY: time difference
Casper, WY 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 15:30 3:30 PM Casper, WY 12:30 12:30 PM You –:–
15:30 3:30 PM
Argentina Standard Time · UTC-3
☀️ 06:09 · 🌙 19:11
12:30 12:30 PM
Mountain Daylight Time · UTC-6
☀️ 07:23 · 🌙 18:19
·
−3 h
Casper, WY is 3 h behind Buenos Aires.
When you, Buenos Aires and Casper, WY 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
🇺🇸 Casper, WY
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
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Time zones side by side
| Detail | 🇦🇷 Buenos Aires | 🇺🇸 Casper, WY |
|---|---|---|
| Local time | 15:30 | 12:30 |
| Local date | Sunday, October 18, 2026 | Sunday, October 18, 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 | 06:09 | 07:23 |
| Sunset | 19:11 | 18:19 |
| Daylight | 13 h 2 min | 10 h 57 min |
| People on this clock | 2,891,082 | 58,763 |
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 Casper, WY: common questions
How far behind Buenos Aires is Casper, WY?
Casper 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 Casper, WY?
At 9:00 AM in Buenos Aires, clocks in Casper show 6:00 AM.
What time is it in Casper, WY, at the end of the working day in Buenos Aires?
The working day in Buenos Aires ends at 6:00 PM; in Casper it is 3:00 PM at that moment.
When do working hours in Buenos Aires and in Casper, WY, 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 Casper.
When is it still the previous day in Casper, WY?
Until 3:00 AM in Buenos Aires it is still the previous day in Casper. The other way round, from 9:00 PM in Casper it is already the next day in Buenos Aires.
Does the time difference between Buenos Aires and Casper, WY, change?
Yes. The clocks change only in Casper. From November 1, 2026, Casper will be 4 hours behind Buenos Aires.
