Casper, WY to Buenos Aires: time difference
Buenos Aires is 3 h ahead of Casper, WY. 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.
Casper, WY 09:59 9:59 AM Buenos Aires 12:59 12:59 PM You –:–
09:59 9:59 AM
Mountain Daylight Time · UTC-6
☀️ 07:23 · 🌙 18:19
12:59 12:59 PM
Argentina Standard Time · UTC-3
☀️ 06:09 · 🌙 19:11
·
+3 h
Buenos Aires is 3 h ahead of Casper, WY.
When you, Casper, WY 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
🇺🇸 Casper, WY
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
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- Right now
Time zones side by side
| Detail | 🇺🇸 Casper, WY | 🇦🇷 Buenos Aires |
|---|---|---|
| Local time | 09:59 | 12:59 |
| Local date | Sunday, October 18, 2026 | Sunday, October 18, 2026 |
| Time zone | Mountain Daylight Time | Argentina Standard Time |
| UTC offset | UTC-6 | UTC-3 |
| Offset from Casper, WY | — | +3 h |
| IANA zone | America/Denver | America/Argentina/Buenos Aires |
| Daylight saving | On summer time → UTC-7, Nov 1, 01:00 | Not observed |
| Sunrise | 07:23 | 06:09 |
| Sunset | 18:19 | 19:11 |
| Daylight | 10 h 57 min | 13 h 2 min |
| People on this clock | 58,763 | 2,891,082 |
Compare Casper, WY with another city
More comparisons with Casper, WY: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Casper, WY and Buenos Aires: common questions
What is the time difference between Casper, WY, and Buenos Aires?
Buenos Aires is 3 hours ahead: it uses UTC−3, while Casper is on UTC−6.
What time is it in Buenos Aires when it is 9:00 AM in Casper, WY?
When it is 9:00 AM in Casper, it is 12:00 PM in Buenos Aires.
What time is it in Buenos Aires when it is 6:00 PM in Casper, WY?
When it is 6:00 PM in Casper, it is 9:00 PM in Buenos Aires.
When is a good time to call Buenos Aires from Casper, WY?
Between 9:00 AM and 3:00 PM in Casper – 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 does the date change in Buenos Aires compared with Casper, WY?
The new day starts in Buenos Aires earlier: at 9:00 PM in Casper it is already midnight there. Until 3:00 AM in Buenos Aires, Casper is still on the previous day.
Is the time difference between Casper, WY, and Buenos Aires the same all year?
No. Only Casper switches to summer time, so the gap changes twice a year. From November 1, 2026, Buenos Aires will be 4 hours ahead of Casper.
