Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between ast and brt?
Arabia Standard Time (ast) is UTC+3 and Brasilia Time (brt) is UTC-3. The difference between them is 6 hours.
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.
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 ast to brt?
Use the interactive converter above. Drag the time slider to any ast time and the brt equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
AST (Riyadh) is 6 hours ahead of BRT (São Paulo). Midday in AST (Riyadh) lines up with 06:00 in BRT (São Paulo).
AST (Riyadh) is in the Asia/Riyadh timezone. BRT (São Paulo) is in America/Sao_Paulo. The difference is 6 hours.
Business hours comparison
There is a 2-hour window each day where both AST (Riyadh) and BRT (São Paulo) are within standard business hours (09:00–17:00).
00:0006:0012:0018:0024:00
AST (Riyadh)
BRT (São Paulo)
Overlap (2h)
When to schedule across time zones
Both AST (Riyadh) and BRT (São Paulo) are in standard hours simultaneously for 2h per day.
15:00 Riyadh / 09:00 São Paulo✓ Both working
16:00 Riyadh / 10:00 São Paulo✓ Both working
Based on standard 09:00–17:00 working hours in each location's local time.
Upcoming public holidays
AST (Riyadh)
No upcoming public holidays this year.
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
How to work with AST (Riyadh) and BRT (São Paulo) time zones
Working across AST (Riyadh) (Saudi Arabia) and BRT (São Paulo) (Brazil) involves a 6-hour gap. The good news: there is a 2-hour mutual window in standard business hours that lets both sides collaborate without anyone joining at an unreasonable hour.
💡 How to schedule across these time zones
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15:00–16:00 in AST (Riyadh) = 09:00–10:00 in BRT (São Paulo). Both sides are in standard business hours during this window.
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16:00–17:00 in AST (Riyadh) = 10:00–11:00 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 AST (Riyadh). The input bar accepts natural language like "3pm", "15:30", or "9am Rome" for instant conversions.