World Timezones

BRT to IRST Converter

Compare IRST to BRT instead
Brasilia Time1:35 amFri, Jun 5
Brasilia TimeBRT
South America · UTC-3
1:35 amFri, Jun 5
12a
1a
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
Iran Standard TimeIRST
Middle East · UTC+3:30
8:05 amFri, Jun 5
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
12a
1a
2a
3a
4a
5a

Offset

The time difference between Brasilia Time and Iran Standard Time is 6.5 hours.

6.5 hours

Brasilia Time (BRT) is behind Iran Standard Time (IRST).

BRT: UTC-3

IRST: UTC+3:30

Neither Brasilia Time nor Iran Standard Time is currently observing daylight saving time.

When to schedule

Business-hours overlap: 9 AM–11 AM in Brasilia Time (3 PM–5 PM in Iran Standard Time).

Both teams are in working hours during this window on weekdays.

Suggested time: 10:00 AM Brasilia Time (4:30 PM Iran Standard Time).

Public holidays in 2026

National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.

Brazil

  • New Year's DayThu, Jan 1
  • CarnivalMon, Feb 16
  • CarnivalTue, Feb 17
  • Good FridayFri, Apr 3
  • Easter SundaySun, Apr 5
  • TiradentesTue, Apr 21
  • Labour DayFri, May 1
  • Corpus ChristiThu, Jun 4
  • Independence DayMon, Sep 7
  • Our Lady of AparecidaMon, Oct 12
  • All Souls' DayMon, Nov 2
  • Republic Proclamation DaySun, Nov 15
  • Black Awareness DayFri, Nov 20
  • Christmas DayFri, Dec 25

About these zones

Brasilia Time is also known as BRT. To call Brazil, dial +55.

Iran Standard Time is also known as IRST. To call Iran, dial +98.

Iran Standard Time is approximately 7,600 miles northeast of Brasilia Time.

Quick reference

Full 24-hour conversion table — tap any time to open it in the converter.

BRTIRSTDay
12:00 am6:30 amSame day
1:00 am7:30 amSame day
2:00 am8:30 amSame day
3:00 am9:30 amSame day
4:00 am10:30 amSame day
5:00 am11:30 amSame day
6:00 am12:30 pmSame day
7:00 am1:30 pmSame day
8:00 am2:30 pmSame day
9:00 am3:30 pmSame day
10:00 am4:30 pmSame day
11:00 am5:30 pmSame day
12:00 pm6:30 pmSame day
1:00 pm7:30 pmSame day
2:00 pm8:30 pmSame day
3:00 pm9:30 pmSame day
4:00 pm10:30 pmSame day
5:00 pm11:30 pmSame day
6:00 pm12:30 am+1 day
7:00 pm1:30 am+1 day
8:00 pm2:30 am+1 day
9:00 pm3:30 am+1 day
10:00 pm4:30 am+1 day
11:00 pm5:30 am+1 day

Daylight saving time

Neither Brasilia Time nor Iran Standard Time observes daylight saving time. The offset between these zones remains constant year-round.

See the daylight saving time page for transition dates across every time zone.

Daylight today

Brasilia Time
Sunrise
6:44 AM
Sunset
5:28 PM
Day length
10h 45m
Iran Standard Time
Sunrise
4:50 AM
Sunset
7:18 PM
Day length
14h 28m

Daylight overlap: 6h 4m — 6:44 AM–12:48 PM in Brasilia Time (1:14 PM–7:18 PM in Iran Standard Time). Both locations are in daylight during this window.

Cities in these zones

Cities in Iran Standard Time

Browse all cities to see the current local time anywhere.

Airports in these zones

Airports in Brasilia Time

  • CGH
  • GRU
  • GIG
  • SDU
  • CNF
  • BSB
  • CWB
  • GYN
  • POA

Airports in Iran Standard Time

  • IKA
  • THR
  • MHD
  • IFN
  • PYK
  • TBZ

Related conversions

Common conversions

What is 9:00 am BRT in IRST?
9:00 am BRT is 3:30 pm IRST.
What is 12:00 pm BRT in IRST?
12:00 pm BRT is 6:30 pm IRST.
What is 12:30 pm BRT in IRST?
12:30 pm BRT is 7:00 pm IRST.
What is 2:00 pm BRT in IRST?
2:00 pm BRT is 8:30 pm IRST.
What is 5:00 pm BRT in IRST?
5:00 pm BRT is 11:30 pm IRST.
What is 11:30 pm BRT in IRST?
11:30 pm BRT is 6:00 am IRST, the next day.