AWST to IRST
-4h 30mAWST
AWSTSOURCEIRST
IRSTGreen rows indicate typical business hours (9 AM - 5 PM)
AWST and IRST on the World Map
The map below highlights the AWST (Australian Western Standard Time) and IRST (Iran Standard Time) timezone regions across the globe.
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.
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 to IRST Time Difference – Complete Guide
AWST runs on Australian Western Standard Time (AWST) at UTC+08:00. IRST runs on Iran Standard Time (IRST) at UTC+03:30. That puts AWST 4 hours 30 minutes behind IRST — a difference of -4h 30m at the current offsets.
In practice, when it is 9:00 AM in AWST it is 4:30 AM in IRST. Midnight in AWST is 7:30 PM in IRST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AWST to IRST time conversion table
| AWST (AWST) | IRST (IRST) | Day |
|---|---|---|
| 12:00 AM | 7:30 PM | previous day |
| 6:00 AM | 1:30 AM | same day |
| 7:00 AM | 2:30 AM | same day |
| 8:00 AM | 3:30 AM | same day |
| 9:00 AM | 4:30 AM | same day |
| 12:00 PM | 7:30 AM | same day |
| 3:00 PM | 10:30 AM | same day |
| 5:00 PM | 12:30 PM | same day |
| 6:00 PM | 1:30 PM | same day |
| 9:00 PM | 4:30 PM | same day |
Why people convert AWST to IRST time
- Scheduling a call from AWST to IRST: a 10:00 AM start in AWST lands at 5:30 AM in IRST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both AWST and IRST are inside the 9-to-5 working day between 1:30 PM and 5:00 PM AWST time (9:00 AM–12:30 PM IRST). That is roughly 3 hours 30 minutes of usable overlap.
- Watching a live event or market open: AWST viewers need 4:30 AM in IRST to catch a 9:00 AM start there, and 4:30 AM if the event is anchored to AWST.
- Always state the zone abbreviation, not just the hour. "3:00 PM AWST" is unambiguous; "3 PM" across a -4h 30m gap is not.
- Block 1:30 PM–5:00 PM AWST as the recurring meeting window if you work primarily from AWST and need IRST colleagues present.
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.
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.
Best time to call between AWST and IRST
Both AWST and IRST sit inside the 9 AM – 5 PM working day between 1:30 PM–5:00 PM AWST, which is 9:00 AM–12:30 PM IRST. That gives roughly 3 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
AWST and IRST overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.
AWST is 4 hours 30 minutes behind IRST (AWST UTC+08:00 → IRST UTC+03:30). The shared working window is 1:30 PM–5:00 PM AWST. 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 AWST and IRST?
AWST (AWST, UTC+08:00) is 4 hours 30 minutes behind IRST (IRST, UTC+03:30). The gap is currently -4h 30m.
How do I convert AWST time to IRST time?
Add -4h 30m to AWST local time. For example, 9:00 AM in AWST is 4:30 AM in IRST.
What time is it in IRST right now?
IRST uses IRST at UTC+03:30. Use the live converter at the top of this page — it updates in real time and already accounts for the -4h 30m offset from AWST.
What is the best time to call IRST from AWST?
Call between 1:30 PM and 5:00 PM AWST — that maps to 9:00 AM–12:30 PM IRST and keeps both parties inside the working day.
Which is behind, AWST or IRST?
AWST is 4 hours 30 minutes behind IRST. When it is 12:00 PM in AWST it is 7:30 AM in IRST.
Does daylight saving time affect the AWST–IRST difference?
Neither zone observes daylight saving time, so the -4h 30m offset between AWST and IRST is fixed all year.
Which other cities share AWST's time zone?
AWST also covers Perth, Mandurah, Bunbury, Geraldton.
Which countries use AWST, AWST's zone?
AWST is used in Australia (Western Australia).
Is there a day difference between AWST and IRST?
Not normally. The -4h 30m gap only pushes the date over the previous day.
What is the time difference between AWST and IRST?
IRST is -4h 30m from AWST.
What timezone is AWST in?
AWST operates on its local timezone.
What timezone is IRST in?
IRST operates on its local timezone.
Which countries use AWST (Australian Western Standard Time)?
AWST is used in Australia (Western Australia).
Does AWST observe daylight saving time?
No, AWST does not observe daylight saving time and remains at UTC+08:00 year-round.
What are some interesting facts about AWST?
Western Australia does not observe daylight saving time. Perth is the most isolated major city in the world.
Which cities are in the IRST timezone?
Major cities in the IRST timezone include Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.
What is the UTC offset for IRST?
Iran Standard Time (IRST) is at UTC+03:30. During daylight saving time, it shifts to IRDT.
What should I know about the IRST timezone?
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).
When is it midnight in AWST, what time is it in IRST?
When it is 12:00 AM (midnight) in AWST (AWST), it is -4h 30m later in IRST (IRST).
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See every conversion from AWST →·See every conversion from IRST →