What is the time difference between IRST and BRT?

Brasília Time (BRT) is 6 hours and 30 minutes behind Iran Standard Time (IRST). IRST uses a UTC offset of UTC+3:30, while BRT uses UTC-3. For example, when it's 9:00 AM in IRST, it's 2:30 AM in BRT. This difference remains constant year-round since neither timezone observes daylight saving time. Use the conversion table above to see the exact time for each hour of the day.

How do I convert IRST to BRT?

To convert IRST to BRT, subtract 6 hours and 30 minutes from the IRST time. For example, 9:00 AM IRST is 2:30 AM BRT, and 5:00 PM IRST is 10:30 AM BRT. Since neither timezone observes DST, this conversion stays the same all year. You can also use the interactive converter above for quick, accurate results.

What time is it in BRT when it's noon in IRST?

When it's 12:00 PM (noon) in IRST, it's 5:30 AM in BRT. This is because BRT is 6 hours and 30 minutes behind IRST. Similarly, when it's 6:00 PM in IRST, it's 11:30 AM in BRT. This relationship is constant throughout the year. The color-coded conversion table above shows every hour mapped between both timezones.

How many hours behind is BRT from IRST?

BRT is 6 hours and 30 minutes behind IRST. This means when it's 9:00 AM in IRST, it's 2:30 AM in BRT, and when it's midnight in IRST, it's 5:30 PM in BRT. This offset is constant throughout the year since neither timezone uses daylight saving time. The conversion table above provides a complete hour-by-hour mapping.

Is BRT ahead or behind IRST?

BRT is behind IRST by 6 hours and 30 minutes. Clocks in BRT show an earlier time than IRST, meaning the day starts later in BRT relative to IRST. For example, when it's noon in IRST, it's still 5:30 AM in BRT. This difference stays the same year-round.

Does IRST observe daylight saving time?

No, Iran Standard Time does not observe daylight saving time. The UTC offset of UTC+3:30 remains the same year-round, which simplifies time conversions. Regions using IRST keep their clocks unchanged regardless of the season.

Does BRT observe daylight saving time?

No, Brasília Time does not observe daylight saving time. The UTC offset of UTC-3 remains the same year-round, making time conversions to BRT more predictable. Countries and regions in this timezone keep their clocks unchanged regardless of the season.

What is the best time to call from IRST to BRT?

The best time for a call between IRST and BRT is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in BRT during their work day, call between 3:30 PM and 11:30 PM your IRST time. Avoid calling too early or late, as the 6 hours and 30 minutes difference means your evening could be their early morning. Check the color-coded conversion table above — green hours indicate business hours in both zones, making it easy to find the ideal time.

Do IRST and BRT ever have the same time?

No, IRST and BRT are always 6 hours and 30 minutes apart and never display the same clock time simultaneously. Neither timezone observes DST, so the difference is constant year-round with no seasonal variation. The 6 hours and 30 minutes offset is determined by their fixed positions relative to the Prime Meridian (UTC). You can always rely on this consistent difference when planning across these timezones.

IRST to BRT Converter

Convert Iran Standard Time to Brasília Time. See the hour-by-hour conversion table below.

Timezone Details

Tehran

6:53 PM

Thursday, April 2, 2026

Tehran (UTC+03:30)

Brasília Time

12:23 PM

Thursday, April 2, 2026

BRT (UTC-03:00)

Difference: -6h 30m

BRT DST: No

24-Hour Overview

Tehran — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

BRT — 24-hour overview

5p5p

8p8p

10p

11p11p

12a

2a2a

5a5a

8a8a

10a

11a11a

12p

2p2p

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

BRT to IRST

Cities in These Timezones

IRST Cities

Tehran

BRT Cities

São Paulo Rio de Janeiro Brasília

More Tools

Compare IRST & BRT Plan a Meeting (IRST & BRT)See on Map

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

Brasília Time on Wikipedia IANA Time Zone Database