No overlap — one side will join outside working hours
JST (Tokyo)
BRT (São Paulo)
00:00
12:00-1dWorking
01:00
13:00-1dWorking
02:00
14:00-1dWorking
03:00
15:00-1dWorking
04:00
16:00-1dWorking
05:00
17:00-1d
06:00
18:00-1d
07:00
19:00-1d
08:00
20:00-1d
09:00Working
21:00-1doff
10:00Working
22:00-1doff
11:00Working
23:00-1doff
12:00Working
00:00off
13:00Working
01:00off
14:00Working
02:00off
15:00Working
03:00off
16:00Working
04:00off
17:00
05:00
18:00
06:00
19:00
07:00
20:00
08:00
21:00
09:00Working
22:00
10:00Working
23:00
11:00Working
Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between jst and brt?
Japan Standard Time (jst) is UTC+9 and Brasilia Time (brt) is UTC-3. The difference between them is 12 hours.
Where is jst used?
Japan Standard Time (jst) is used in Japan and surrounding regions. The IANA timezone identifier is Asia/Tokyo.
Where is brt used?
Brasilia Time (brt) is used in Brazil and surrounding regions. The IANA timezone identifier is America/Sao_Paulo.
How do I convert jst to brt?
Use the interactive converter above. Drag the time slider to any jst time and the brt equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
JST (Tokyo) is 12 hours ahead of BRT (São Paulo). When it's noon in JST (Tokyo), it's 00:00 in BRT (São Paulo).
JST (Tokyo) runs on Asia/Tokyo; BRT (São Paulo) runs on America/Sao_Paulo. Together they are 12 hours apart.
Mutual working hours
There is no business hours overlap between JST (Tokyo) and BRT (São Paulo) during standard working hours (9:00–17:00). Meetings would require one party to work outside normal hours.
Best call times between these locations
JST (Tokyo) and BRT (São Paulo) have no shared working window. These slots minimize out-of-hours disruption for both sides.
04:00 Tokyo / 16:00 São Paulo⚡ One side off-hours
⚠️ 5h before working hours in Tokyo
09:00 Tokyo / 21:00 São Paulo⚡ One side off-hours
⚠️ 5h after working hours in São Paulo
16:00 Tokyo / 04:00 São Paulo⚡ One side off-hours
⚠️ 5h before working hours in São Paulo
Working hours defined as 09:00–17:00 local time for each location.
Public holidays this year
⚡ Upcoming holidays in both locations, confirm with your contact before booking.
JST (Tokyo)7 holidays
Jul 20Marine Day
Aug 11Mountain Day
Sep 21Respect for the Aged Day
Sep 23Autumnal Equinox Day
Oct 12Sports Day
BRT (São Paulo)7 holidays
Jul 9Constitutionalist Revolution of 1932SOON
Sep 7Independence Day
Oct 12Our Lady of Aparecida
Nov 2All Souls' Day
Nov 15Republic Proclamation Day
JST (Tokyo) and BRT (São Paulo) — practical scheduling
JST (Tokyo) (Japan) and BRT (São Paulo) (Brazil) are 12 hours apart — far enough that standard 9–5 schedules do not overlap. Any real-time meeting means someone is joining outside their normal hours.
💡 Practical scheduling guidelines
⚡
A 04:00 meeting in JST (Tokyo) means 16:00 in BRT (São Paulo) (5h before working hours in Tokyo).
⚡
A 09:00 meeting in JST (Tokyo) means 21:00 in BRT (São Paulo) (5h after working hours in São Paulo).
⚡
A 16:00 meeting in JST (Tokyo) means 04:00 in BRT (São Paulo) (5h before working hours in São Paulo).
With no shared business hours, these slots distribute the scheduling burden as evenly as possible between both locations.
Avoid scheduling mistakes — especially around daylight saving changes. Use the ClockinSync Chrome Extension to instantly verify and compare both time zones directly in your browser, without manual calculations.
Need a specific time? Use the slider or type directly into the input bar — it understands "3pm", "15:30", and location-specific formats like "9am JST (Tokyo)".
