Rio de Janeiro to St.Catharines: time difference
St.Catharines 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 04:34 4:34 AM St.Catharines 03:34 3:34 AM You –:–
04:34 4:34 AM
Brasilia Standard Time · UTC-3
☀️ 05:16 · 🌙 18:00
03:34 3:34 AM
Eastern Daylight Time · UTC-4
☀️ 07:38 · 🌙 18:26
·
−1 h
St.Catharines is 1 h behind Rio de Janeiro.
When you, Rio de Janeiro and St.Catharines 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
🇨🇦 St.Catharines
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 | 🇨🇦 St.Catharines |
|---|---|---|
| Local time | 04:34 | 03:34 |
| Local date | Wednesday, October 21, 2026 | Wednesday, October 21, 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/Toronto |
| Daylight saving | Not observed | On summer time → UTC-5, Nov 1, 01:00 |
| Sunrise | 05:16 | 07:38 |
| Sunset | 18:00 | 18:26 |
| Daylight | 12 h 44 min | 10 h 48 min |
| People on this clock | 6,211,223 | 133,113 |
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 St.Catharines: common questions
What is the time difference between Rio de Janeiro and St.Catharines?
St.Catharines is 1 hour behind: it uses UTC−4, while Rio de Janeiro is on UTC−3.
What time is it in St.Catharines at the start of the working day in Rio de Janeiro?
The working day in Rio de Janeiro starts at 9:00 AM; in St.Catharines it is 8:00 AM at that moment.
What time is it in St.Catharines 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 St.Catharines.
When is a good time to call St.Catharines 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 St.Catharines – both places are within working hours (9:00 AM–6:00 PM).
When does the date change in St.Catharines compared with Rio de Janeiro?
The new day starts in St.Catharines later: until 1:00 AM in Rio de Janeiro, it is still the previous day there. From 11:00 PM in St.Catharines, Rio de Janeiro is already on the next day.
Is the time difference between Rio de Janeiro and St.Catharines the same all year?
No. Only St.Catharines switches to summer time, so the gap changes twice a year. From November 1, 2026, St.Catharines will be 2 hours behind Rio de Janeiro.
