JST ↔ BRT Time Converter

Brasilia Time (BRT) is 12h behind of Japan Standard Time (JST). This comes from JST being at UTC+9 and BRT at UTC-3. Three quick examples: 9:00 AM JST = 9:00 PM BRT; 12:00 PM JST = 12:00 AM BRT; 5:00 PM JST = 5:00 AM BRT.

To convert JST to BRT, subtract 12 hours to the JST time. For example: 12:00 PM JST → 12:00 AM BRT. When the result goes past midnight, increment the date by one day (shown as "+1 Day" in the converter). The converter on this page handles all edge cases automatically.

Brasilia Time (BRT) is 12h behind of Japan Standard Time (JST). The reverse is also true: JST is 12h ahead of BRT. A real-world example: if a colleague in São Paulo proposes a noon meeting, that means 12:00 AM on your JST clock in Tokyo.

Japan Standard Time (JST) is the standard civil time used across Tokyo, Osaka, Kyoto, Yokohama and surrounding regions. It sits at UTC+9 relative to UTC. It does not observe Daylight Saving Time, so the UTC offset remains constant at UTC+9 every day of the year. Major cities in this zone include: Tokyo, Osaka, Kyoto, Yokohama, Nagoya, Sapporo, Fukuoka.

Brasilia Time (BRT) is the civil time standard for São Paulo, Rio de Janeiro, Brasília, Salvador and the surrounding area. Operating at UTC-3 from UTC, it does not observe Daylight Saving Time — the offset stays fixed at UTC-3 all year with no seasonal change. Cities in this zone include: São Paulo, Rio de Janeiro, Brasília, Salvador, Fortaleza, Belo Horizonte, Manaus.

No. Neither JST nor BRT observes Daylight Saving Time. The offset between them stays constant at 12h behind every single day of the year, with no seasonal adjustment on either side. This makes JST–BRT one of the simpler pairs to schedule across, since you never have to recalculate for clock changes.

The best meeting window is where standard working hours (9 AM – 6 PM) overlap in both zones. Since BRT is 12h behind of JST, mornings in the earlier zone align with afternoons or evenings in the later zone. As a rule of thumb: 8 AM – 11 AM in the earlier zone usually works for both sides. Check the meeting hours table above for this specific pair's recommended slots, and avoid any time that falls before 7 AM or after 9 PM on either side.

Type any time into the BRT field in the bidirectional converter above — it calculates the JST result instantly and works equally well in both directions. You can also add 12 hours from the BRT time manually to get the JST equivalent. For a dedicated reverse converter, visit: BRT to JST converter ↗.

Yes, several hours in the day will cross midnight when converting between these two zones. When a converted time crosses 11:59 PM, the date advances by one day — shown as "+1 Day" in the converter. When it goes before 12:00 AM, the date moves back — shown as "-1 Day". The 24-hour reference table on this page also flags day changes in the Day column. Always check the date indicator when sending calendar invites or scheduling calls across these two zones.

Japan Standard Time (JST) is the official time standard for: Tokyo, Osaka, Kyoto, Yokohama, Nagoya, Sapporo, Fukuoka. The zone operates at UTC+9, with no seasonal variation. It is one of the most widely used time zones for international business in its region.

Brasilia Time (BRT) covers: São Paulo, Rio de Janeiro, Brasília, Salvador, Fortaleza, Belo Horizonte, Manaus. It runs at UTC-3, fixed year-round with no DST adjustment. When coordinating calls between JST and BRT, use the live clocks at the top of this page to see the exact current local time in both zones simultaneously before confirming a meeting time.

No. Japan abolished Daylight Saving Time in 1951 and has not observed it since. Japan Standard Time (JST) remains fixed at UTC+9 throughout the entire year, with no seasonal clock changes. This means the JST–BRT difference is always predictable: You can rely on the standard 12h behind difference for any fixed recurring meeting time.

Yes. The live clocks at the top update every second so you always see the current time in both zones. The converter handles DST changes automatically, and the 24-hour table gives you a printable reference for the full day. For recurring meetings, pick a slot from the "Best Meeting Hours" table and set your calendar event with the correct IANA timezone (Asia/Tokyo for JST, America/Sao_Paulo for BRT) so future occurrences self-adjust for any clock changes.