Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between brt and ast?
Brasilia Time (brt) is UTC-3 and Arabia Standard Time (ast) is UTC+3. The difference between them is 6 hours.
Where is brt used?
Brasilia Time (brt) is used in Brazil and surrounding regions. The IANA timezone identifier is America/Sao_Paulo.
Where is ast used?
Arabia Standard Time (ast) is used in Saudi Arabia and surrounding regions. The IANA timezone identifier is Asia/Riyadh. Note: ast is ambiguous and may refer to other timezones.
How do I convert brt to ast?
Use the interactive converter above. Drag the time slider to any brt time and the ast equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
BRT (São Paulo) is 6 hours behind AST (Riyadh). When BRT (São Paulo) clocks hit noon, AST (Riyadh) reads 18:00.
BRT (São Paulo) observes America/Sao_Paulo and AST (Riyadh) observes Asia/Riyadh — a 6 hours gap between them.
Business hours comparison
Every working day, BRT (São Paulo) and AST (Riyadh) are both in business hours for 2 hours simultaneously.
00:0006:0012:0018:0024:00
BRT (São Paulo)
AST (Riyadh)
Overlap (2h)
Optimal meeting slots
BRT (São Paulo) and AST (Riyadh) share 2 hours of business hours overlap daily.
09:00 São Paulo / 15:00 Riyadh✓ Both working
10:00 São Paulo / 16:00 Riyadh✓ Both working
Assumes a standard 9 AM–5 PM workday in each location's local timezone.
Holiday calendar for both locations
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
AST (Riyadh)
No upcoming public holidays this year.
Working across BRT (São Paulo) and AST (Riyadh)
Coordinating between BRT (São Paulo) (Brazil) and AST (Riyadh) (Saudi Arabia) means working around a 6-hour time difference. The 2-hour overlap window gives both teams a natural slot for real-time collaboration without anyone working outside normal hours.
💡 Best practice for cross-timezone meetings
✅
Schedule at 09:00–10:00 (BRT (São Paulo)) for a 15:00–16:00 slot in AST (Riyadh) — the sweet spot where both teams are working.
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Schedule at 10:00–11:00 (BRT (São Paulo)) for a 16:00–17:00 slot in AST (Riyadh) — the sweet spot where both teams are working.
Recurring meetings are particularly vulnerable to DST shifts. The ClockinSync Chrome Extension alerts you before the offset changes.
Drag the slider at the top to convert any BRT (São Paulo) time instantly. You can also type natural language like "3pm", "15:00", or a location name to get an immediate answer.