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.

São Paulo to IRST

+6h 30m

São Paulo

BRTSOURCE

Brazil · UTC-03:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

IRST

UTC+03:30

HH06

MM30

18:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

São Paulo

IRST

12:00 AM

6:30 AM

2:00 AM

8:30 AM

4:00 AM

10:30 AM

6:00 AM

12:30 PM

8:00 AM

2:30 PM

10:00 AM

4:30 PM

12:00 PM

6:30 PM

2:00 PM

8:30 PM

4:00 PM

10:30 PM

6:00 PM

12:30 AM+1

8:00 PM

2:30 AM+1

10:00 PM

4:30 AM+1

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

BRT and IRST on the World Map

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

BRT Zone

→

IRST Zone

Explore all world timezones interactively →

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

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

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 →

São Paulo to IRST Time Difference – Complete Guide

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

In practice, when it is 9:00 AM in São Paulo it is 3:30 PM in IRST. Midnight in São Paulo is 6:30 AM in IRST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

São Paulo to IRST time conversion table

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

Why people convert São Paulo to IRST time

Scheduling a call from São Paulo to IRST: a 10:00 AM start in São Paulo lands at 4:30 PM in IRST, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both São Paulo and IRST are inside the 9-to-5 working day between 9:00 AM and 10:30 AM BRT time (3:30 PM–5:00 PM IRST). That is roughly 1 hours 30 minutes of usable overlap.
Coordinating a São Paulo-based team with IRST contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.

Always state the zone abbreviation, not just the hour. "3:00 PM BRT" is unambiguous; "3 PM" across a +6h 30m gap is not.
Block 9:00 AM–10:30 AM BRT as the recurring meeting window if you work primarily from São Paulo and need IRST colleagues present.

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.

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.

Best time to call between São Paulo and IRST

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

Business hours overlap

São Paulo and IRST overlap for only 90 minutes (9:00 AM–10:30 AM BRT), so meetings have to be booked precisely.

São Paulo is 6 hours 30 minutes ahead of IRST (BRT UTC-03:00 → IRST UTC+03:30). The shared working window is 9:00 AM–10:30 AM BRT. 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 São Paulo and IRST?

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

How do I convert São Paulo time to IRST time?

Add +6h 30m to São Paulo local time. For example, 9:00 AM in São Paulo is 3:30 PM in IRST.

What time is it in IRST right now?

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

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

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

Which is ahead, São Paulo or IRST?

São Paulo is 6 hours 30 minutes ahead of IRST. When it is 12:00 PM in São Paulo it is 6:30 PM in IRST.

Do São Paulo and IRST use different time zones?

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

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

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

Which other cities share São Paulo's time zone?

BRT also covers São Paulo, Rio de Janeiro, Brasília, Belo Horizonte, Salvador, Fortaleza, Recife, Curitiba.

Which countries use BRT, São Paulo's zone?

BRT is used in Brazil (eastern).

Is there a day difference between São Paulo and IRST?

Not normally. The +6h 30m gap only pushes the date over for late-evening times.

What is the time difference between São Paulo and IRST?

IRST is +6h 30m from São Paulo.

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.