Convert AWST to IRST
IRST is 4 hours 30 minutes behind AWST. AWST is UTC+8 and IRST is UTC+3:30.
Right now: AWST · IRST
Best time to schedule a meeting
Standard 9–5 working hours overlap for 3 hours: 2:00 PM–5:00 PM AWST (9:00 AM–12:00 PM IRST). Schedule meetings inside that window.
| AWST | IRST | Suitable? |
|---|---|---|
| 9:00 AM | 4:30 AM | outside 9–5 |
| 10:00 AM | 5:30 AM | outside 9–5 |
| 11:00 AM | 6:30 AM | outside 9–5 |
| 12:00 PM | 7:30 AM | outside 9–5 |
| 1:00 PM | 8:30 AM | outside 9–5 |
| 2:00 PM | 9:30 AM | working hours |
| 3:00 PM | 10:30 AM | working hours |
| 4:00 PM | 11:30 AM | working hours |
| 5:00 PM | 12:30 PM | working hours |
AWST to IRST conversion table
| AWST | IRST |
|---|---|
| 12:00 AM | 7:30 PM (previous day) |
| 1:00 AM | 8:30 PM (previous day) |
| 2:00 AM | 9:30 PM (previous day) |
| 3:00 AM | 10:30 PM (previous day) |
| 4:00 AM | 11:30 PM (previous day) |
| 5:00 AM | 12:30 AM |
| 6:00 AM | 1:30 AM |
| 7:00 AM | 2:30 AM |
| 8:00 AM | 3:30 AM |
| 9:00 AM | 4:30 AM |
| 10:00 AM | 5:30 AM |
| 11:00 AM | 6:30 AM |
| 12:00 PM | 7:30 AM |
| 1:00 PM | 8:30 AM |
| 2:00 PM | 9:30 AM |
| 3:00 PM | 10:30 AM |
| 4:00 PM | 11:30 AM |
| 5:00 PM | 12:30 PM |
| 6:00 PM | 1:30 PM |
| 7:00 PM | 2:30 PM |
| 8:00 PM | 3:30 PM |
| 9:00 PM | 4:30 PM |
| 10:00 PM | 5:30 PM |
| 11:00 PM | 6:30 PM |
About AWST
Australian Western Standard Time (AWST) is UTC+8. It is used in Perth and Western Australia.
Australian Western Standard Time is UTC+8 and Western Australia does not observe daylight saving — it has rejected it in four referendums, most recently in 2009. Perth therefore keeps the same offset all year while Sydney moves, so the gap between Australia's two largest business centres is two hours in winter and three in summer.
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?
Neither AWST nor IRST shifts with the seasons, so this 4.5-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 AWST in IRST?
9:00 AM AWST is 4:30 AM IRST.
Is IRST ahead of AWST?
IRST is 4 hours 30 minutes behind AWST.
Which time zone does this use?
AWST is UTC+8 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.