Castle Rock, CO to Buenos Aires: time difference
Buenos Aires is 3 h ahead of Castle Rock, CO. Live clocks for both, the working hours they share, and how each one sits against your own time.
🇦🇷 Buenos Aires, Argentina
16
- Argentina Standard Time
- UTC-3
- Daytime
☀️ 06:19 · 🌙 19:04 · 12 h 45 min
+3 h
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Castle Rock, CO 12:17 12:17 PM Buenos Aires 15:17 3:17 PM You –:–
12:17 12:17 PM
Mountain Daylight Time · UTC-6
☀️ 07:05 · 🌙 18:29
15:17 3:17 PM
Argentina Standard Time · UTC-3
☀️ 06:19 · 🌙 19:04
·
+3 h
Buenos Aires is 3 h ahead of Castle Rock, CO.
When you, Castle Rock, 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
🇺🇸 Castle Rock, 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 | 🇺🇸 Castle Rock, CO | 🇦🇷 Buenos Aires |
|---|---|---|
| Local time | 12:17 | 15:17 |
| Local date | Saturday, October 10, 2026 | Saturday, October 10, 2026 |
| Time zone | Mountain Daylight Time | Argentina Standard Time |
| UTC offset | UTC-6 | UTC-3 |
| Offset from Castle Rock, 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 | 07:05 | 06:19 |
| Sunset | 18:29 | 19:04 |
| Daylight | 11 h 25 min | 12 h 45 min |
| People on this clock | 73,158 | 2,891,082 |
Compare Castle Rock, CO with another city
More comparisons with Castle Rock, CO: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Castle Rock, CO and Buenos Aires: common questions
What is the time difference between Castle Rock, CO, and Buenos Aires?
Buenos Aires is 3 hours ahead: it uses UTC−3, while Castle Rock is on UTC−6.
What time is it in Buenos Aires at the start of the working day in Castle Rock, CO?
The working day in Castle Rock starts at 9:00 AM; in Buenos Aires it is 12:00 PM at that moment.
What time is it in Buenos Aires when it is 6:00 PM in Castle Rock, CO?
When it is 6:00 PM in Castle Rock, it is 9:00 PM in Buenos Aires.
When do working hours in Castle Rock, CO, and in Buenos Aires overlap?
Working hours (9:00 AM–6:00 PM) overlap from 9:00 AM to 3:00 PM in Castle Rock, which is 12:00 PM to 6:00 PM in Buenos Aires.
When does the date change in Buenos Aires compared with Castle Rock, CO?
The new day starts in Buenos Aires earlier: at 9:00 PM in Castle Rock it is already midnight there. Until 3:00 AM in Buenos Aires, Castle Rock is still on the previous day.
Does the time difference between Castle Rock, CO, and Buenos Aires change?
Yes. The clocks change only in Castle Rock. From November 1, 2026, Buenos Aires will be 4 hours ahead of Castle Rock.
