Observatory log
Tokyo and San Justo, compared
- 01Difference now
San Justo is 12 hours behind Tokyo.
Tokyo: JST (UTC+9) · San Justo: UTC−3 (UTC−3)
- 02Through 2026–2027
The difference stays the same all year.
- 1 January 2026 – 31 December 2027−12 h
Difference of San Justo 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 San Justo
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 San Justo (yesterday) · 1 h.
- 05Weekend
Tokyo: Saturday and Sunday
San Justo: Saturday and Sunday
24 hours
A day in Tokyo, in San Justo
| Tokyo | San Justo | 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 San Justo
More time differences with Tokyo
Questions
Asked about Tokyo and San Justo
What is the time difference between Tokyo and San Justo?
San Justo is 12 hours behind Tokyo. The difference stays the same all year.
What is the best time for a call between Tokyo and San Justo?
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 San Justo · 1 h; Tue–Fri: 09:00–10:00 in Tokyo = 21:00–22:00 in San Justo (yesterday) · 1 h.
When does the time difference between Tokyo and San Justo change?
It does not change in the next 12 months: Tokyo and San Justo either keep the same time all year or change their clocks on the same dates.