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.

IRST to Brazil

-6h 30m

IRST

IRSTSOURCE

UTC+03:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Brazil

BRT

UTC-03:00

HH05

MM30

05:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

IRST

Brazil

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

IRST vs Brazil: Offsets, DST and Best Call Times

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

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

IRST to Brazil time conversion table

IRST (IRST)	Brazil (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 IRST to Brazil time

Scheduling a call from IRST to Brazil: a 10:00 AM start in IRST lands at 3:30 AM in Brazil, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both IRST and Brazil 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.
Watching a live event or market open: IRST viewers need 2:30 AM in Brazil to catch a 9:00 AM start there, and 6:30 AM if the event is anchored to IRST.

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 IRST and need Brazil 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 IRST and Brazil

Both IRST and Brazil 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

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

IRST is 6 hours 30 minutes behind Brazil (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 IRST and Brazil?

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

How do I convert IRST time to Brazil time?

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

What time is it in Brazil right now?

Brazil 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 IRST.