Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

BRT to Iran

+6h 30m

BRT

BRTSOURCE

UTC-03:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Iran

IRST

UTC+03:30

HH06

MM30

18:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

BRT

Iran

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

BRT vs Iran: Offsets, DST and Best Call Times

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

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

BRT to Iran time conversion table

BRT (BRT)	Iran (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 BRT to Iran time

Scheduling a call from BRT to Iran: a 10:00 AM start in BRT lands at 4:30 PM in Iran, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both BRT and Iran 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.
Booking travel or deliveries: tracking Iran local time against BRT keeps pickup windows and arrival estimates honest across the +6h 30m offset.

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 BRT and need Iran 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 BRT and Iran

Both BRT and Iran 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

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

BRT is 6 hours 30 minutes ahead of Iran (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 BRT and Iran?

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

How do I convert BRT time to Iran time?

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

What time is it in Iran right now?

Iran 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 BRT.