Convert AEST to IRST
IRST is 6 hours 30 minutes behind AEST. AEST is UTC+10 and IRST is UTC+3:30.
Right now: AEST · IRST
Best time to schedule a meeting
Standard 9–5 working hours overlap for 1 hour: 4:00 PM–5:00 PM AEST (9:00 AM–10:00 AM IRST). Schedule meetings inside that window.
| AEST | IRST | 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 |
AEST to IRST conversion table
| AEST | IRST |
|---|---|
| 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 AEST
Australian Eastern Standard Time (AEST) is UTC+10. It is used in Sydney, Melbourne and Brisbane in the southern winter.
Australian Eastern Standard Time is UTC+10, covering Sydney, Melbourne, Brisbane and Canberra in winter. The complication is that Queensland does not observe daylight saving while New South Wales and Victoria do — so from October to April, Brisbane stays on AEST while Sydney moves to AEDT, and two cities on the same coast are an hour apart for half the year.
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.
Does this gap change with the seasons?
This gap is seasonal. The abbreviations themselves are fixed offsets, but the region on AEST switches to AEDT (UTC+11) from October to April. So the 6.5-hour figure on this page is correct for the part of the year when both places are actually on these abbreviations, and changes by an hour outside it.
IRST does not shift, so the whole change comes from one side. A recurring meeting fixed in IRST will appear to move by an hour for everyone on the other side, twice a year, without anyone changing anything.
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 AEST in IRST?
9:00 AM AEST is 2:30 AM IRST.
Is IRST ahead of AEST?
IRST is 6 hours 30 minutes behind AEST.
Which time zone does this use?
AEST is UTC+10 and IRST is UTC+3:30. 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.