Convert IRST to AWST
AWST is 4 hours 30 minutes ahead of IRST. IRST is UTC+3:30 and AWST is UTC+8.
Right now: IRST · AWST
Best time to schedule a meeting
Standard 9–5 working hours overlap for 4 hours: 9:00 AM–1:00 PM IRST (1:00 PM–5:00 PM AWST). Schedule meetings inside that window.
| IRST | AWST | Suitable? |
|---|---|---|
| 9:00 AM | 1:30 PM | working hours |
| 10:00 AM | 2:30 PM | working hours |
| 11:00 AM | 3:30 PM | working hours |
| 12:00 PM | 4:30 PM | working hours |
| 1:00 PM | 5:30 PM | outside 9–5 |
| 2:00 PM | 6:30 PM | outside 9–5 |
| 3:00 PM | 7:30 PM | outside 9–5 |
| 4:00 PM | 8:30 PM | outside 9–5 |
| 5:00 PM | 9:30 PM | outside 9–5 |
IRST to AWST conversion table
| IRST | AWST |
|---|---|
| 12:00 AM | 4:30 AM |
| 1:00 AM | 5:30 AM |
| 2:00 AM | 6:30 AM |
| 3:00 AM | 7:30 AM |
| 4:00 AM | 8:30 AM |
| 5:00 AM | 9:30 AM |
| 6:00 AM | 10:30 AM |
| 7:00 AM | 11:30 AM |
| 8:00 AM | 12:30 PM |
| 9:00 AM | 1:30 PM |
| 10:00 AM | 2:30 PM |
| 11:00 AM | 3:30 PM |
| 12:00 PM | 4:30 PM |
| 1:00 PM | 5:30 PM |
| 2:00 PM | 6:30 PM |
| 3:00 PM | 7:30 PM |
| 4:00 PM | 8:30 PM |
| 5:00 PM | 9:30 PM |
| 6:00 PM | 10:30 PM |
| 7:00 PM | 11:30 PM |
| 8:00 PM | 12:30 AM (next day) |
| 9:00 PM | 1:30 AM (next day) |
| 10:00 PM | 2:30 AM (next day) |
| 11:00 PM | 3:30 AM (next day) |
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 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.
Does this gap change with the seasons?
Neither IRST nor AWST 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 IRST in AWST?
9:00 AM IRST is 1:30 PM AWST.
Is AWST ahead of IRST?
AWST is 4 hours 30 minutes ahead of IRST.
Which time zone does this use?
IRST is UTC+3:30 and AWST is UTC+8. 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.