Frederick, MD to Rio de Janeiro: time difference
Rio de Janeiro is 1 h ahead of Frederick, MD. 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.
Frederick, MD 22:47 10:47 PM Rio de Janeiro 23:47 11:47 PM You –:–
22:47 10:47 PM
Eastern Daylight Time · UTC-4
☀️ 07:15 · 🌙 18:40
23:47 11:47 PM
Brasilia Standard Time · UTC-3
☀️ 05:26 · 🌙 17:55
·
+1 h
Rio de Janeiro is 1 h ahead of Frederick, MD.
When you, Frederick, MD and Rio de Janeiro are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇺🇸 Frederick, MD
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
🇧🇷 Rio de Janeiro
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
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Time zones side by side
| Detail | 🇺🇸 Frederick, MD | 🇧🇷 Rio de Janeiro |
|---|---|---|
| Local time | 22:47 | 23:47 |
| Local date | Saturday, October 10, 2026 | Saturday, October 10, 2026 |
| Time zone | Eastern Daylight Time | Brasilia Standard Time |
| UTC offset | UTC-4 | UTC-3 |
| Offset from Frederick, MD | — | +1 h |
| IANA zone | America/New York | America/Sao Paulo |
| Daylight saving | On summer time → UTC-5, Nov 1, 01:00 | Not observed |
| Sunrise | 07:15 | 05:26 |
| Sunset | 18:40 | 17:55 |
| Daylight | 11 h 25 min | 12 h 30 min |
| People on this clock | 72,237 | 6,211,223 |
Compare Frederick, MD with another city
More comparisons with Frederick, MD: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Frederick, MD and Rio de Janeiro: common questions
How far ahead of Frederick, MD, is Rio de Janeiro?
Rio de Janeiro is 1 hour ahead of Frederick: UTC−3 against UTC−4.
What time is it in Rio de Janeiro at the start of the working day in Frederick, MD?
The working day in Frederick starts at 9:00 AM; in Rio de Janeiro it is 10:00 AM at that moment.
If it is 6:00 PM in Frederick, MD, what time is it in Rio de Janeiro?
At 6:00 PM in Frederick, clocks in Rio de Janeiro show 7:00 PM.
When is a good time to call Rio de Janeiro from Frederick, MD?
Between 9:00 AM and 5:00 PM in Frederick – that is 10:00 AM to 6:00 PM in Rio de Janeiro – both places are within working hours (9:00 AM–6:00 PM).
When does the date change in Rio de Janeiro compared with Frederick, MD?
The new day starts in Rio de Janeiro earlier: at 11:00 PM in Frederick it is already midnight there. Until 1:00 AM in Rio de Janeiro, Frederick is still on the previous day.
Is the time difference between Frederick, MD, and Rio de Janeiro the same all year?
No. Only Frederick switches to summer time, so the gap changes twice a year. From November 1, 2026, Rio de Janeiro will be 2 hours ahead of Frederick.
