Rio de Janeiro to Frederick, MD: time difference
Frederick, MD is 1 h behind Rio de Janeiro. 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.
Rio de Janeiro 00:40 12:40 AM Frederick, MD 23:40 11:40 PM You –:–
00:40 12:40 AM
Brasilia Standard Time · UTC-3
☀️ 05:25 · 🌙 17:56
23:40 11:40 PM
Eastern Daylight Time · UTC-4
☀️ 07:15 · 🌙 18:40
·
−1 h
Frederick, MD is 1 h behind Rio de Janeiro.
When you, Rio de Janeiro and Frederick, MD are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇧🇷 Rio de Janeiro
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
🇺🇸 Frederick, MD
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 21 9 PM 22 10 PM
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇧🇷 Rio de Janeiro | 🇺🇸 Frederick, MD |
|---|---|---|
| Local time | 00:40 | 23:40 |
| Local date | Sunday, October 11, 2026 | Saturday, October 10, 2026 |
| Time zone | Brasilia Standard Time | Eastern Daylight Time |
| UTC offset | UTC-3 | UTC-4 |
| Offset from Rio de Janeiro | — | −1 h |
| IANA zone | America/Sao Paulo | America/New York |
| Daylight saving | Not observed | On summer time → UTC-5, Nov 1, 01:00 |
| Sunrise | 05:25 | 07:15 |
| Sunset | 17:56 | 18:40 |
| Daylight | 12 h 31 min | 11 h 25 min |
| People on this clock | 6,211,223 | 72,237 |
Compare Rio de Janeiro with another city
More comparisons with Rio de Janeiro: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Rio de Janeiro and Frederick, MD: common questions
How far behind Rio de Janeiro is Frederick, MD?
Frederick is 1 hour behind Rio de Janeiro: UTC−4 against UTC−3.
If it is 9:00 AM in Rio de Janeiro, what time is it in Frederick, MD?
At 9:00 AM in Rio de Janeiro, clocks in Frederick show 8:00 AM.
What time is it in Frederick, MD, when it is 6:00 PM in Rio de Janeiro?
When it is 6:00 PM in Rio de Janeiro, it is 5:00 PM in Frederick.
When is a good time to call Frederick, MD, from Rio de Janeiro?
Between 10:00 AM and 6:00 PM in Rio de Janeiro – that is 9:00 AM to 5:00 PM in Frederick – both places are within working hours (9:00 AM–6:00 PM).
When is it still the previous day in Frederick, MD?
Until 1:00 AM in Rio de Janeiro it is still the previous day in Frederick. The other way round, from 11:00 PM in Frederick it is already the next day in Rio de Janeiro.
Does the time difference between Rio de Janeiro and Frederick, MD, change?
Yes. The clocks change only in Frederick. From November 1, 2026, Frederick will be 2 hours behind Rio de Janeiro.
