🇦🇷 Buenos Aires, Argentina
51
- Argentina Standard Time
- UTC-3
- Daytime
☀️ 06:19 · 🌙 19:04 · 12 h 45 min
Buenos Aires to Castle Rock, CO: time difference
Castle Rock, 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 15:59 3:59 PM Castle Rock, CO 12:59 12:59 PM You –:–
15:59 3:59 PM
Argentina Standard Time · UTC-3
☀️ 06:19 · 🌙 19:04
12:59 12:59 PM
Mountain Daylight Time · UTC-6
☀️ 07:05 · 🌙 18:29
·
−3 h
Castle Rock, CO is 3 h behind Buenos Aires.
When you, Buenos Aires and Castle Rock, 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
🇺🇸 Castle Rock, 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 | 🇺🇸 Castle Rock, CO |
|---|---|---|
| Local time | 15:59 | 12:59 |
| Local date | Saturday, October 10, 2026 | Saturday, October 10, 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 | 06:19 | 07:05 |
| Sunset | 19:04 | 18:29 |
| Daylight | 12 h 45 min | 11 h 25 min |
| People on this clock | 2,891,082 | 73,158 |
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 Castle Rock, CO: common questions
What is the time difference between Buenos Aires and Castle Rock, CO?
Castle Rock is 3 hours behind: it uses UTC−6, while Buenos Aires is on UTC−3.
What time is it in Castle Rock, CO, when it is 9:00 AM in Buenos Aires?
When it is 9:00 AM in Buenos Aires, it is 6:00 AM in Castle Rock.
If it is 6:00 PM in Buenos Aires, what time is it in Castle Rock, CO?
At 6:00 PM in Buenos Aires, clocks in Castle Rock show 3:00 PM.
Is there a time when both Buenos Aires and Castle Rock, CO, are at work?
Yes: from 12:00 PM to 6:00 PM in Buenos Aires (9:00 AM to 3:00 PM in Castle Rock), the working days (9:00 AM–6:00 PM) overlap.
Until what time in Buenos Aires is it still yesterday in Castle Rock, CO?
Before 3:00 AM in Buenos Aires, the date in Castle Rock has not changed yet. From 9:00 PM in Castle Rock, it is already the next day in Buenos Aires.
Is the time difference between Buenos Aires and Castle Rock, CO, the same all year?
No. Only Castle Rock switches to summer time, so the gap changes twice a year. From November 1, 2026, Castle Rock will be 4 hours behind Buenos Aires.
