IRST to Perth
+4h 30mIRST
IRSTSOURCEPerth
AWSTGreen rows indicate typical business hours (9 AM - 5 PM)
IRST and AWST on the World Map
The map below highlights the IRST (Iran Standard Time) and AWST (Australian Western Standard Time) timezone regions across the globe.
IRST – Iran Standard Time
UTC+03:30Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.
- •IRST is one of only a few time zones with a 30-minute offset.
- •Iran observes daylight saving time, switching to IRDT (UTC+04:30).
- •Tehran has a metropolitan population of over 16 million.
AWST – Australian Western Standard Time
UTC+08:00Australian Western Standard Time (AWST) is the time zone for Western Australia, 8 hours ahead of UTC.
- •Western Australia does not observe daylight saving time.
- •Perth is the most isolated major city in the world.
- •AWST is the same offset as China Standard Time and Singapore Time.
About Perth
WikipediaPerth operates on Australian Western Time (AWST), UTC+8 with no daylight saving. As Australia's mining capital, Perth coordinates with Asian markets.
Western Australia does not observe daylight saving time.
Comparing Time Zones: IRST and Perth
IRST runs on Iran Standard Time (IRST) at UTC+03:30. Perth runs on Australian Western Standard Time (AWST) at UTC+08:00. That puts IRST 4 hours 30 minutes ahead of Perth — a difference of +4h 30m at the current offsets.
In practice, when it is 9:00 AM in IRST it is 1:30 PM in Perth. Midnight in IRST is 4:30 AM in Perth. Neither zone observes daylight saving time, so the offset between them stays constant all year.
IRST to Perth time conversion table
| IRST (IRST) | Perth (AWST) | Day |
|---|---|---|
| 12:00 AM | 4:30 AM | same day |
| 6:00 AM | 10:30 AM | same day |
| 7:00 AM | 11:30 AM | same day |
| 8:00 AM | 12:30 PM | same day |
| 9:00 AM | 1:30 PM | same day |
| 12:00 PM | 4:30 PM | same day |
| 3:00 PM | 7:30 PM | same day |
| 5:00 PM | 9:30 PM | same day |
| 6:00 PM | 10:30 PM | same day |
| 9:00 PM | 1:30 AM | next day |
Why people convert IRST to Perth time
- Scheduling a call from IRST to Perth: a 10:00 AM start in IRST lands at 2:30 PM in Perth, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both IRST and Perth are inside the 9-to-5 working day between 9:00 AM and 12:30 PM IRST time (1:30 PM–5:00 PM AWST). That is roughly 3 hours 30 minutes of usable overlap.
- Booking travel or deliveries: tracking Perth local time against IRST keeps pickup windows and arrival estimates honest across the +4h 30m offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a +4h 30m gap is not.
- Block 9:00 AM–12:30 PM IRST as the recurring meeting window if you work primarily from IRST and need Perth colleagues present.
About IRST (Iran Standard Time)
Iran Standard Time (IRST) is one of the few time zones with a 30-minute offset. Iran observes daylight saving time (IRDT, UTC+04:30) from late March to late September. Tehran, the capital, is one of the largest cities in the Middle East.
About AWST (Australian Western Standard Time)
Australian Western Standard Time (AWST) is used in Western Australia. WA does not observe daylight saving time, having rejected it in multiple referendums. Perth is the most remote major city in the world.
Best time to call between IRST and Perth
Both IRST and Perth sit inside the 9 AM – 5 PM working day between 9:00 AM–12:30 PM IRST, which is 1:30 PM–5:00 PM AWST. That gives roughly 3 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
IRST and Perth overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.
IRST is 4 hours 30 minutes ahead of Perth (IRST UTC+03:30 → AWST UTC+08:00). The shared working window is 9:00 AM–12:30 PM IRST. Remember to re-check around daylight-saving transitions.
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between IRST and Perth?
IRST (IRST, UTC+03:30) is 4 hours 30 minutes ahead of Perth (AWST, UTC+08:00). The gap is currently +4h 30m.
How do I convert IRST time to Perth time?
Add +4h 30m to IRST local time. For example, 9:00 AM in IRST is 1:30 PM in Perth.
What time is it in Perth right now?
Perth uses AWST at UTC+08:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +4h 30m offset from IRST.
What is the best time to call Perth from IRST?
Call between 9:00 AM and 12:30 PM IRST — that maps to 1:30 PM–5:00 PM AWST and keeps both parties inside the working day.
Which is ahead, IRST or Perth?
IRST is 4 hours 30 minutes ahead of Perth. When it is 12:00 PM in IRST it is 4:30 PM in Perth.
Do IRST and Perth use different time zones?
IRST uses IRST at UTC+03:30, while Perth (Australia) uses AWST at UTC+08:00. The IANA identifiers are Asia/Tehran and Australia/Perth.
Does daylight saving time affect the IRST–Perth difference?
Neither zone observes daylight saving time, so the +4h 30m offset between IRST and Perth is fixed all year.
Which other cities share IRST's time zone?
IRST also covers Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.
Which countries use IRST, IRST's zone?
IRST is used in Iran.
Is there a day difference between IRST and Perth?
Not normally. The +4h 30m gap only pushes the date over for late-evening times.
What is the time difference between IRST and Perth?
Perth is +4h 30m from IRST.
What timezone is IRST in?
IRST operates on its local timezone.
What timezone is Perth in?
Perth operates on Australian Western Time (AWST), UTC+8 with no daylight saving. As Australia's mining capital, Perth coordinates with Asian markets.
What are the business hours in Perth?
Standard business hours in Perth are 9:00 AM - 5:00 PM AWST.
Which countries use IRST (Iran Standard Time)?
IRST is used in Iran.
Does IRST observe daylight saving time?
Yes, IRST switches to IRDT during summer months.
What are some interesting facts about IRST?
IRST is one of only a few time zones with a 30-minute offset. Iran observes daylight saving time, switching to IRDT (UTC+04:30).
Which cities are in the AWST timezone?
Major cities in the AWST timezone include Perth, Mandurah, Bunbury, Geraldton.
What is the UTC offset for AWST?
Australian Western Standard Time (AWST) is at UTC+08:00.
What should I know about the AWST timezone?
Western Australia does not observe daylight saving time. Perth is the most isolated major city in the world.
When is it midnight in IRST, what time is it in Perth?
When it is 12:00 AM (midnight) in IRST (IRST), it is +4h 30m later in Perth (AWST).
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