San Juan to Buenos Aires: time difference
Buenos Aires is 1 h ahead of San Juan. Live clocks for both, the working hours they share, and how each one sits against your own time.
+1 h
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
San Juan 20:28 8:28 PM Buenos Aires 21:28 9:28 PM You –:–
20:28 8:28 PM
Atlantic Standard Time · UTC-4
☀️ 06:17 · 🌙 18:08
21:28 9:28 PM
Argentina Standard Time · UTC-3
☀️ 06:20 · 🌙 19:03
·
+1 h
Buenos Aires is 1 h ahead of San Juan.
When you, San Juan 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
🇵🇷 San Juan
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
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 0 12 AM
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇵🇷 San Juan | 🇦🇷 Buenos Aires |
|---|---|---|
| Local time | 20:28 | 21:28 |
| Local date | Friday, October 9, 2026 | Friday, October 9, 2026 |
| Time zone | Atlantic Standard Time | Argentina Standard Time |
| UTC offset | UTC-4 | UTC-3 |
| Offset from San Juan | — | +1 h |
| IANA zone | America/Puerto Rico | America/Argentina/Buenos Aires |
| Daylight saving | Not observed | Not observed |
| Sunrise | 06:17 | 06:20 |
| Sunset | 18:08 | 19:03 |
| Daylight | 11 h 50 min | 12 h 43 min |
| People on this clock | 322,854 | 2,891,082 |
Compare San Juan with another city
More comparisons with San Juan: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
San Juan and Buenos Aires: common questions
How many hours ahead of San Juan is Buenos Aires?
The clocks in Buenos Aires are 1 hour ahead of those in San Juan (UTC−3 and UTC−4).
What time is it in Buenos Aires at the start of the working day in San Juan?
The working day in San Juan starts at 9:00 AM; in Buenos Aires it is 10:00 AM at that moment.
What time is it in Buenos Aires when it is 6:00 PM in San Juan?
When it is 6:00 PM in San Juan, it is 7:00 PM in Buenos Aires.
Is there a time when both San Juan and Buenos Aires are at work?
Yes: from 9:00 AM to 5:00 PM in San Juan (10:00 AM to 6:00 PM in Buenos Aires), the working days (9:00 AM–6:00 PM) overlap.
When does the date change in Buenos Aires compared with San Juan?
The new day starts in Buenos Aires earlier: at 11:00 PM in San Juan it is already midnight there. Until 1:00 AM in Buenos Aires, San Juan is still on the previous day.
Does the time difference between San Juan and Buenos Aires change?
No. Neither place uses daylight saving time, so the difference stays 1 hour all year.
