Does it handle Daylight Saving Time?

Yes, the tool automatically adjusts for Daylight Saving Time based on the specific date you select, ensuring accurate conversions year-round.

Can I add multiple cities?

Yes, you can add as many cities as you need to the dashboard to compare times across your entire global network simultaneously.

Tehran to São Paulo

-6h 30m

Tehran

IRSTSOURCE

Iran · UTC+03:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

São Paulo

BRT

Brazil · UTC-03:00

HH05

MM30

05:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Tehran

São Paulo

12:00 AM

5:30 PM-1

2:00 AM

7:30 PM-1

4:00 AM

9:30 PM-1

6:00 AM

11:30 PM-1

8:00 AM

1:30 AM

10:00 AM

3:30 AM

12:00 PM

5:30 AM

2:00 PM

7:30 AM

4:00 PM

9:30 AM

6:00 PM

11:30 AM

8:00 PM

1:30 PM

10:00 PM

3:30 PM

Green rows indicate typical business hours (9 AM - 5 PM)

IRST and BRT on the World Map

The map below highlights the IRST (Iran Standard Time) and BRT (Brasilia Time) timezone regions across the globe.

IRST Zone

→

BRT Zone

Explore all world timezones interactively →

IRST – Iran Standard Time

UTC+03:30

Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.

Countries in IRST

Iran

Major Cities in IRST

TehranIsfahanMashhadTabrizShirazKaraj

Key Facts about IRST

•IRST is one of only a few time zones with a 30-minute offset.
•Iran observes daylight saving time, switching to IRDT (UTC+04:30).
•Tehran has a metropolitan population of over 16 million.

Daylight Saving:Yes – switches to IRDT

Learn more about IRST on Wikipedia

BRT – Brasilia Time

UTC-03:00

Brasilia Time (BRT) is the time zone for eastern Brazil, 3 hours behind UTC.

Countries in BRT

Brazil (eastern)

Major Cities in BRT

São PauloRio de JaneiroBrasíliaBelo HorizonteSalvadorFortalezaRecifeCuritiba

Key Facts about BRT

•Brazil abolished daylight saving time in 2019.
•São Paulo is the largest city in the Southern Hemisphere.
•BRT is 2 hours ahead of EST.
•Brazil spans four different time zones.
•The B3 stock exchange in São Paulo operates on BRT.

Daylight Saving:No – UTC-03:00 year-round

Learn more about BRT on Wikipedia

About Tehran

Wikipedia

Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.

Population:9.4 million

Metro:16.8 million

Business Hours:8:00 AM - 4:00 PM IRST

Currency:IRR (﷼)

Stock Exchange:TSE (Tehran Stock Exchange)

Key Landmarks

Azadi TowerGolestan PalaceGrand BazaarMilad TowerTabiat Bridge

Did You Know?

Iran Standard Time (IRST) is one of few timezones with a 30-minute offset (UTC+3:30).

Learn more about IRST timezone →

About São Paulo

Wikipedia

São Paulo operates on Brasília Time (BRT), UTC-3. As South America's largest financial center, São Paulo's B3 exchange is the Americas' second-largest.

Population:12.4 million

Metro:22.4 million

Business Hours:9:00 AM - 6:00 PM BRT

Currency:BRL (R$)

Stock Exchange:B3 (Brasil Bolsa Balcão)

Key Landmarks

Paulista AvenueIbirapuera ParkSão Paulo CathedralMASPPinacoteca

Did You Know?

The city has more helicopters than any other city in the world due to traffic congestion.

Learn more about BRT timezone →

Tehran to São Paulo Time Difference – Complete Guide

Tehran runs on Iran Standard Time (IRST) at UTC+03:30. São Paulo runs on Brasilia Standard Time (BRT) at UTC-03:00. That puts Tehran 6 hours 30 minutes behind São Paulo — a difference of -6h 30m at the current offsets.

In practice, when it is 9:00 AM in Tehran it is 2:30 AM in São Paulo. Midnight in Tehran is 5:30 PM in São Paulo. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Tehran to São Paulo time conversion table

Tehran (IRST)	São Paulo (BRT)	Day
12:00 AM	5:30 PM	previous day
6:00 AM	11:30 PM	previous day
7:00 AM	12:30 AM	same day
8:00 AM	1:30 AM	same day
9:00 AM	2:30 AM	same day
12:00 PM	5:30 AM	same day
3:00 PM	8:30 AM	same day
5:00 PM	10:30 AM	same day
6:00 PM	11:30 AM	same day
9:00 PM	2:30 PM	same day

Why people convert Tehran to São Paulo time

Scheduling a call from Tehran to São Paulo: a 10:00 AM start in Tehran lands at 3:30 AM in São Paulo, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Tehran and São Paulo are inside the 9-to-5 working day between 3:30 PM and 5:00 PM IRST time (9:00 AM–10:30 AM BRT). That is roughly 1 hours 30 minutes of usable overlap.
Keeping family and friends in sync: knowing that 8:00 PM in Tehran is 1:30 PM in São Paulo makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a -6h 30m gap is not.
Block 3:30 PM–5:00 PM IRST as the recurring meeting window if you work primarily from Tehran and need São Paulo colleagues present.

About IRST (Iran Standard Time)

Iran Standard Time (IRST) is one of the few time zones with a 30-minute offset. Iran observes daylight saving time (IRDT, UTC+04:30) from late March to late September. Tehran, the capital, is one of the largest cities in the Middle East.

About BRT (Brasilia Time)

Brasilia Time (BRT) is the standard time in the most populous regions of Brazil, including São Paulo, Rio de Janeiro, and the capital Brasília. Brazil abolished daylight saving time in 2019, so BRT is now observed year-round in these regions. Brazil spans four time zones in total.

Best time to call between Tehran and São Paulo

Both Tehran and São Paulo sit inside the 9 AM – 5 PM working day between 3:30 PM–5:00 PM IRST, which is 9:00 AM–10:30 AM BRT. That gives roughly 1 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

Tehran and São Paulo overlap for only 90 minutes (3:30 PM–5:00 PM IRST), so meetings have to be booked precisely.

Tehran is 6 hours 30 minutes behind São Paulo (IRST UTC+03:30 → BRT UTC-03:00). The shared working window is 3:30 PM–5:00 PM IRST. Remember to re-check around daylight-saving transitions.

Learn More About Time

Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between Tehran and São Paulo?

Tehran (IRST, UTC+03:30) is 6 hours 30 minutes behind São Paulo (BRT, UTC-03:00). The gap is currently -6h 30m.

How do I convert Tehran time to São Paulo time?

Add -6h 30m to Tehran local time. For example, 9:00 AM in Tehran is 2:30 AM in São Paulo.

What time is it in São Paulo right now?

São Paulo uses BRT at UTC-03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -6h 30m offset from Tehran.

What is the best time to call São Paulo from Tehran?

Call between 3:30 PM and 5:00 PM IRST — that maps to 9:00 AM–10:30 AM BRT and keeps both parties inside the working day.

Which is behind, Tehran or São Paulo?

Tehran is 6 hours 30 minutes behind São Paulo. When it is 12:00 PM in Tehran it is 5:30 AM in São Paulo.

Do Tehran and São Paulo use different time zones?

Tehran (Iran) uses IRST at UTC+03:30, while São Paulo (Brazil) uses BRT at UTC-03:00. The IANA identifiers are Asia/Tehran and America/Sao_Paulo.

Does daylight saving time affect the Tehran–São Paulo difference?

Neither zone observes daylight saving time, so the -6h 30m offset between Tehran and São Paulo is fixed all year.

Which other cities share Tehran's time zone?

IRST also covers Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.

Which countries use IRST, Tehran's zone?

IRST is used in Iran.

Is there a day difference between Tehran and São Paulo?

Not normally. The -6h 30m gap only pushes the date over the previous day.

What is the time difference between Tehran and São Paulo?

São Paulo is -6h 30m from Tehran.

What timezone is Tehran in?

Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.

What timezone is São Paulo in?

São Paulo operates on Brasília Time (BRT), UTC-3. As South America's largest financial center, São Paulo's B3 exchange is the Americas' second-largest.

What are the business hours in Tehran?

Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.

What are the business hours in São Paulo?

Standard business hours in São Paulo are 9:00 AM - 6:00 PM BRT.

What is the best time to schedule a call between Tehran and São Paulo?

The best overlap for a call is when both cities are in business hours. Tehran works 8:00 AM - 4:00 PM IRST and São Paulo works 9:00 AM - 6:00 PM BRT (-6h 30m difference). Try scheduling during the overlapping window for maximum convenience.

What currencies are used in Tehran and São Paulo?

Tehran uses IRR (﷼) while São Paulo uses BRL (R$). Check current exchange rates when planning travel or business between these cities.

How do Tehran and São Paulo compare in size?

Tehran has a population of approximately 9.4 million (metro: 16.8 million), while São Paulo has approximately 12.4 million (metro: 22.4 million).

What are the major landmarks in Tehran and São Paulo?

Tehran is known for Azadi Tower, Golestan Palace, Grand Bazaar. São Paulo is famous for Paulista Avenue, Ibirapuera Park, São Paulo Cathedral.

Do Tehran and São Paulo have stock exchanges?

Yes. Tehran has the TSE (Tehran Stock Exchange) and São Paulo has the B3 (Brasil Bolsa Balcão). The -6h 30m time difference affects trading hour overlaps between these exchanges.