Observatory log
Tokyo and Rio Claro, compared
- 01Difference now
Rio Claro is 12 hours behind Tokyo.
Tokyo: JST (UTC+9) · Rio Claro: UTC−3 (UTC−3)
- 02Through 2026–2027
The difference stays the same all year.
- 1 January 2026 – 31 December 2027−12 h
Difference of Rio Claro from Tokyo. It changes on the days either place changes its clocks (dates local to that place).
- 03Shared working hours
Their working days never overlap.
Counted as 09:00–17:00 local time on each place’s own working days, for the next seven days.
- 04Best time to meet
21:00–22:00 in Tokyo = 09:00–10:00 in Rio Claro
No shared office hours: this is early or late for one side (Mon–Fri).
Also possible: Tue–Fri: 09:00–10:00 in Tokyo = 21:00–22:00 in Rio Claro (yesterday) · 1 h.
- 05Weekend
Tokyo: Saturday and Sunday
Rio Claro: Saturday and Sunday
24 hours
A day in Tokyo, in Rio Claro
| Tokyo | Rio Claro | Working hours, evening, night or weekend in each place |
|---|---|---|
| 00:00 | 12:00Yesterday | |
| 01:00 | 13:00Yesterday | |
| 02:00 | 14:00Yesterday | |
| 03:00 | 15:00Yesterday | |
| 04:00 | 16:00Yesterday | |
| 05:00 | 17:00Yesterday | |
| 06:00 | 18:00Yesterday | |
| 07:00 | 19:00Yesterday | |
| 08:00 | 20:00Yesterday | |
| 09:00 | 21:00Yesterday | |
| 10:00 | 22:00Yesterday | |
| 11:00 | 23:00Yesterday | |
| 12:00 | 00:00 | |
| 13:00 | 01:00 | |
| 14:00 | 02:00 | |
| 15:00 | 03:00 | |
| 16:00 | 04:00 | |
| 17:00 | 05:00 | |
| 18:00 | 06:00 | |
| 19:00 | 07:00 | |
| 20:00 | 08:00 | |
| 21:00 | 09:00 | |
| 22:00 | 10:00 | |
| 23:00 | 11:00 |
Working hoursEarly or eveningNightWeekend
Plan a meeting: Tokyo and Rio Claro
More time differences with Tokyo
Questions
Asked about Tokyo and Rio Claro
What is the time difference between Tokyo and Rio Claro?
Rio Claro is 12 hours behind Tokyo. The difference stays the same all year.
What is the best time for a call between Tokyo and Rio Claro?
No shared office hours. The least awkward windows, early or late for one side: Mon–Fri: 21:00–22:00 in Tokyo = 09:00–10:00 in Rio Claro · 1 h; Tue–Fri: 09:00–10:00 in Tokyo = 21:00–22:00 in Rio Claro (yesterday) · 1 h.
When does the time difference between Tokyo and Rio Claro change?
It does not change in the next 12 months: Tokyo and Rio Claro either keep the same time all year or change their clocks on the same dates.