Convert IRST to BRT
BRT is 6 hours 30 minutes behind IRST. IRST is UTC+3:30 and BRT is UTC−3.
Right now: IRST · BRT
Best time to schedule a meeting
Standard 9–5 working hours overlap for 1 hour: 4:00 PM–5:00 PM IRST (9:00 AM–10:00 AM BRT). Schedule meetings inside that window.
| IRST | BRT | Suitable? |
|---|---|---|
| 9:00 AM | 2:30 AM | outside 9–5 |
| 10:00 AM | 3:30 AM | outside 9–5 |
| 11:00 AM | 4:30 AM | outside 9–5 |
| 12:00 PM | 5:30 AM | outside 9–5 |
| 1:00 PM | 6:30 AM | outside 9–5 |
| 2:00 PM | 7:30 AM | outside 9–5 |
| 3:00 PM | 8:30 AM | outside 9–5 |
| 4:00 PM | 9:30 AM | working hours |
| 5:00 PM | 10:30 AM | working hours |
IRST to BRT conversion table
| IRST | BRT |
|---|---|
| 12:00 AM | 5:30 PM (previous day) |
| 1:00 AM | 6:30 PM (previous day) |
| 2:00 AM | 7:30 PM (previous day) |
| 3:00 AM | 8:30 PM (previous day) |
| 4:00 AM | 9:30 PM (previous day) |
| 5:00 AM | 10:30 PM (previous day) |
| 6:00 AM | 11:30 PM (previous day) |
| 7:00 AM | 12:30 AM |
| 8:00 AM | 1:30 AM |
| 9:00 AM | 2:30 AM |
| 10:00 AM | 3:30 AM |
| 11:00 AM | 4:30 AM |
| 12:00 PM | 5:30 AM |
| 1:00 PM | 6:30 AM |
| 2:00 PM | 7:30 AM |
| 3:00 PM | 8:30 AM |
| 4:00 PM | 9:30 AM |
| 5:00 PM | 10:30 AM |
| 6:00 PM | 11:30 AM |
| 7:00 PM | 12:30 PM |
| 8:00 PM | 1:30 PM |
| 9:00 PM | 2:30 PM |
| 10:00 PM | 3:30 PM |
| 11:00 PM | 4:30 PM |
About IRST
Iran Standard Time (IRST) is UTC+3:30. It is used in Iran, all year.
Iran Standard Time is UTC+3:30. Iran ran daylight saving for decades and stopped in 2022, so material written before then puts the country half an hour further ahead in summer and is now wrong. Half-hour offsets are rare enough that scheduling tools sometimes round them, which turns a correct calculation into a thirty-minute error.
About BRT
Brasília Time (BRT) is UTC−3. It is used in São Paulo, Rio de Janeiro and most of populated Brazil.
Brasília Time is UTC−3, covering São Paulo, Rio de Janeiro and Brasília. Brazil abolished daylight saving in 2019, so the offset is now fixed year-round — but a great deal of older software, and a lot of published advice, still assumes the southern-hemisphere shift that used to run from October to February. If a Brazilian meeting time was correct last year and is an hour out now, an out-of-date time zone database is the likely cause.
Does this gap change with the seasons?
Neither IRST nor BRT shifts with the seasons, so this 6.5-hour difference holds all year. That is unusual enough to be worth relying on: most cross-continental gaps move twice a year.
This is the reason scheduling systems store an IANA zone such as Region/City rather than an offset or an abbreviation: the zone knows its own rules and the offset does not.
Frequently asked questions
What time is 9:00 AM IRST in BRT?
9:00 AM IRST is 2:30 AM BRT.
Is BRT ahead of IRST?
BRT is 6 hours 30 minutes behind IRST.
Which time zone does this use?
IRST is UTC+3:30 and BRT is UTC−3. Both abbreviations denote a single fixed offset, so this conversion never shifts with daylight saving — what changes is which abbreviation a place is using at the time.