Rio de Janeiro to Mason, OH: time difference
Mason, OH 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 10:03 10:03 AM Mason, OH 09:03 9:03 AM You –:–
10:03 10:03 AM
Brasilia Standard Time · UTC-3
☀️ 05:18 · 🌙 17:59
09:03 9:03 AM
Eastern Daylight Time · UTC-4
☀️ 07:52 · 🌙 18:54
·
−1 h
Mason, OH is 1 h behind Rio de Janeiro.
When you, Rio de Janeiro and Mason, OH 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
🇺🇸 Mason, OH
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 | 🇺🇸 Mason, OH |
|---|---|---|
| Local time | 10:03 | 09:03 |
| Local date | Monday, October 19, 2026 | Monday, October 19, 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 | 05:18 | 07:52 |
| Sunset | 17:59 | 18:54 |
| Daylight | 12 h 41 min | 11 h 2 min |
| People on this clock | 6,211,223 | 35,000 |
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 Mason, OH: common questions
How far behind Rio de Janeiro is Mason, OH?
Mason is 1 hour behind Rio de Janeiro: UTC−4 against UTC−3.
What time is it in Mason, OH, at the start of the working day in Rio de Janeiro?
The working day in Rio de Janeiro starts at 9:00 AM; in Mason it is 8:00 AM at that moment.
If it is 6:00 PM in Rio de Janeiro, what time is it in Mason, OH?
At 6:00 PM in Rio de Janeiro, clocks in Mason show 5:00 PM.
When is a good time to call Mason, OH, 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 Mason – both places are within working hours (9:00 AM–6:00 PM).
When does the date change in Mason, OH, compared with Rio de Janeiro?
The new day starts in Mason later: until 1:00 AM in Rio de Janeiro, it is still the previous day there. From 11:00 PM in Mason, Rio de Janeiro is already on the next day.
Does the time gap between Rio de Janeiro and Mason, OH, change during the year?
Yes – daylight saving time is used in Mason but not in Rio de Janeiro. From November 1, 2026, Mason will be 2 hours behind Rio de Janeiro.
