Observatory log
London and Rio Negro, compared
- 01Difference now
Rio Negro is 4 hours behind London.
London: BST (UTC+1) · Rio Negro: UTC−3 (UTC−3)
Next changeFrom 25 October 2026: Rio Negro is 3 hours behind London.
- 02Through 2026–2027
- 1 January 2026 – 29 March 2026−3 h
- 29 March 2026 – 25 October 2026−4 h
- 25 October 2026 – 28 March 2027−3 h
- 28 March 2027 – 31 October 2027−4 h
- 31 October 2027 – 31 December 2027−3 h
Difference of Rio Negro from London. It changes on the days either place changes its clocks (dates local to that place).
- 03Shared working hours
- Tue–Fri: 13:00–17:00 in London = 09:00–13:00 in Rio Negro · 4 h
- Mon: 12:00–17:00 in London = 09:00–14:00 in Rio Negro · 5 h
Counted as 09:00–17:00 local time on each place’s own working days, for the next seven days.
- 04Best time to meet
13:00–17:00 in London = 09:00–13:00 in Rio Negro
Inside both working days (Tue–Fri).
- 05Weekend
London: Saturday and Sunday
Rio Negro: Saturday and Sunday
24 hours
A day in London, in Rio Negro
| London | Rio Negro | Working hours, evening, night or weekend in each place |
|---|---|---|
| 00:00 | 20:00Yesterday | |
| 01:00 | 21:00Yesterday | |
| 02:00 | 22:00Yesterday | |
| 03:00 | 23:00Yesterday | |
| 04:00 | 00:00 | |
| 05:00 | 01:00 | |
| 06:00 | 02:00 | |
| 07:00 | 03:00 | |
| 08:00 | 04:00 | |
| 09:00 | 05:00 | |
| 10:00 | 06:00 | |
| 11:00 | 07:00 | |
| 12:00 | 08:00 | |
| 13:00 | 09:00 | |
| 14:00 | 10:00 | |
| 15:00 | 11:00 | |
| 16:00 | 12:00 | |
| 17:00 | 13:00 | |
| 18:00 | 14:00 | |
| 19:00 | 15:00 | |
| 20:00 | 16:00 | |
| 21:00 | 17:00 | |
| 22:00 | 18:00 | |
| 23:00 | 19:00 |
Working hoursEarly or eveningNightWeekend
Plan a meeting: London and Rio Negro
More time differences with London
Questions
Asked about London and Rio Negro
What is the time difference between London and Rio Negro?
Rio Negro is 4 hours behind London. This holds until 25 October 2026; then Rio Negro is 3 hours behind London.
What is the best time for a call between London and Rio Negro?
Inside both working days: Tue–Fri: 13:00–17:00 in London = 09:00–13:00 in Rio Negro · 4 h.
When does the time difference between London and Rio Negro change?
In the next 12 months it changes on: 25 October 2026 (−3 h); 28 March 2027 (−4 h).