Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between gmt and brt?
Greenwich Mean Time (gmt) is UTC+1 and Brasilia Time (brt) is UTC-3. The difference between them is 4 hours.
Where is gmt used?
Greenwich Mean Time (gmt) is used in United Kingdom and surrounding regions. The IANA timezone identifier is Europe/London.
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 gmt to brt?
Use the interactive converter above. Drag the time slider to any gmt time and the brt equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
GMT (London) to BRT (São Paulo) — exact time difference
GMT (London) is 4 hours ahead of BRT (São Paulo). When GMT (London) clocks hit noon, BRT (São Paulo) reads 08:00.
GMT (London) is in the Europe/London timezone. BRT (São Paulo) is in America/Sao_Paulo. The difference is 4 hours.
Working hours overlap
Every working day, GMT (London) and BRT (São Paulo) are both in business hours for 4 hours simultaneously.
00:0006:0012:0018:0024:00
GMT (London)
BRT (São Paulo)
Overlap (4h)
When to schedule across time zones
Both GMT (London) and BRT (São Paulo) are in standard hours simultaneously for 4h per day. 3 recommended slots shown below.
13:00 London / 09:00 São Paulo✓ Both working
14:00 London / 10:00 São Paulo✓ Both working
15:00 London / 11:00 São Paulo✓ Both working
Based on standard 09:00–17:00 working hours in each location's local time.
Holiday calendar for both locations
⚡ Both locations have upcoming holidays, check availability before scheduling.
GMT (London)6 holidays
Jul 13Battle of the Boyne
Aug 3Summer Bank Holiday
Aug 31Summer Bank Holiday
Nov 30Saint Andrew's Day
Dec 25Christmas Day
BRT (São Paulo)7 holidays
Jul 9Constitutionalist Revolution of 1932
Sep 7Independence Day
Oct 12Our Lady of Aparecida
Nov 2All Souls' Day
Nov 15Republic Proclamation Day
Working across GMT (London) and BRT (São Paulo)
Working across GMT (London) (United Kingdom) and BRT (São Paulo) (Brazil) involves a 4-hour gap. The good news: there is a 4-hour mutual window in standard business hours that lets both sides collaborate without anyone joining at an unreasonable hour.
💡 Best practice for cross-timezone meetings
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13:00–14:00 in GMT (London) = 09:00–10:00 in BRT (São Paulo). Both sides are in standard business hours during this window.
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14:00–15:00 in GMT (London) = 10:00–11:00 in BRT (São Paulo). Both sides are in standard business hours during this window.
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15:00–16:00 in GMT (London) = 11:00–12:00 in BRT (São Paulo). Both sides are in standard business hours during this window.
DST transitions can silently shift your meeting times by an hour. The ClockinSync Chrome Extension tracks these changes automatically so you never get caught off guard.
Use the time slider above to find the exact equivalent time for any moment in GMT (London). The input bar accepts natural language like "3pm", "15:30", or "9am Rome" for instant conversions.
