IRST to Sydney
+6h 30mIRST
IRSTSOURCESydney
AESTGreen rows indicate typical business hours (9 AM - 5 PM)
IRST and AEST on the World Map
The map below highlights the IRST (Iran Standard Time) and AEST (Australian Eastern 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.
AEST – Australian Eastern Standard Time
UTC+10:00Australian Eastern Standard Time (AEST) covers eastern Australia, 10 hours ahead of UTC.
- •Queensland does not observe daylight saving time, staying on AEST year-round.
- •Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
- •The Australian Securities Exchange (ASX) operates on AEST/AEDT.
- •AEST is 15 hours ahead of EST during winter.
About Sydney
WikipediaSydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.
Sydney is one of the first major cities to welcome the New Year.
Time Conversion Guide: IRST to Sydney
IRST runs on Iran Standard Time (IRST) at UTC+03:30. Sydney runs on Australian Eastern Standard Time (AEST) at UTC+10:00. That puts IRST 6 hours 30 minutes ahead of Sydney — a difference of +6h 30m at the current offsets.
In practice, when it is 9:00 AM in IRST it is 3:30 PM in Sydney. Midnight in IRST is 6:30 AM in Sydney. Neither zone observes daylight saving time, so the offset between them stays constant all year.
IRST to Sydney time conversion table
| IRST (IRST) | Sydney (AEST) | Day |
|---|---|---|
| 12:00 AM | 6:30 AM | same day |
| 6:00 AM | 12:30 PM | same day |
| 7:00 AM | 1:30 PM | same day |
| 8:00 AM | 2:30 PM | same day |
| 9:00 AM | 3:30 PM | same day |
| 12:00 PM | 6:30 PM | same day |
| 3:00 PM | 9:30 PM | same day |
| 5:00 PM | 11:30 PM | same day |
| 6:00 PM | 12:30 AM | next day |
| 9:00 PM | 3:30 AM | next day |
Why people convert IRST to Sydney time
- Scheduling a call from IRST to Sydney: a 10:00 AM start in IRST lands at 4:30 PM in Sydney, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both IRST and Sydney are inside the 9-to-5 working day between 9:00 AM and 10:30 AM IRST time (3:30 PM–5:00 PM AEST). That is roughly 1 hours 30 minutes of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in IRST is 2:30 AM in Sydney makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a +6h 30m gap is not.
- Block 9:00 AM–10:30 AM IRST as the recurring meeting window if you work primarily from IRST and need Sydney colleagues present.
- Sydney: Clocks spring forward on Sat, Oct 3, 2026. Any meeting series spanning that date will shift by an hour in local time.
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 AEST (Australian Eastern Standard Time)
Australian Eastern Standard Time (AEST) is used in the eastern states of Australia including New South Wales, Victoria, Queensland, Tasmania, and the ACT. During summer (October to April), NSW, VIC, TAS, and ACT switch to Australian Eastern Daylight Time (AEDT, UTC+11:00), while Queensland remains on AEST year-round.
Best time to call between IRST and Sydney
Both IRST and Sydney sit inside the 9 AM – 5 PM working day between 9:00 AM–10:30 AM IRST, which is 3:30 PM–5:00 PM AEST. That gives roughly 1 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
IRST and Sydney overlap for only 90 minutes (9:00 AM–10:30 AM IRST), so meetings have to be booked precisely.
IRST is 6 hours 30 minutes ahead of Sydney (IRST UTC+03:30 → AEST UTC+10:00). The shared working window is 9:00 AM–10:30 AM IRST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
IRST
Does not observe DST
Sydney
❄ Currently in Standard Time
Standard: UTC+10:00 · DST: UTC+11:00
Clocks spring forward on Sat, Oct 3, 2026
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 Sydney?
IRST (IRST, UTC+03:30) is 6 hours 30 minutes ahead of Sydney (AEST, UTC+10:00). The gap is currently +6h 30m.
How do I convert IRST time to Sydney time?
Add +6h 30m to IRST local time. For example, 9:00 AM in IRST is 3:30 PM in Sydney.
What time is it in Sydney right now?
Sydney uses AEST at UTC+10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +6h 30m offset from IRST.
What is the best time to call Sydney from IRST?
Call between 9:00 AM and 10:30 AM IRST — that maps to 3:30 PM–5:00 PM AEST and keeps both parties inside the working day.
Which is ahead, IRST or Sydney?
IRST is 6 hours 30 minutes ahead of Sydney. When it is 12:00 PM in IRST it is 6:30 PM in Sydney.
Do IRST and Sydney use different time zones?
IRST uses IRST at UTC+03:30, while Sydney (Australia) uses AEST at UTC+10:00. The IANA identifiers are Asia/Tehran and Australia/Sydney.
Does daylight saving time affect the IRST–Sydney difference?
Neither zone observes daylight saving time, so the +6h 30m offset between IRST and Sydney 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 Sydney?
Not normally. The +6h 30m gap only pushes the date over for late-evening times.
What is the time difference between IRST and Sydney?
Sydney is +6h 30m from IRST.
What timezone is IRST in?
IRST operates on its local timezone.
What timezone is Sydney in?
Sydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.
What are the business hours in Sydney?
Standard business hours in Sydney are 9:00 AM - 5:00 PM AEST.
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 AEST timezone?
Major cities in the AEST timezone include Sydney, Melbourne, Brisbane, Canberra, Hobart, Gold Coast.
What is the UTC offset for AEST?
Australian Eastern Standard Time (AEST) is at UTC+10:00. During daylight saving time, it shifts to AEDT.
What should I know about the AEST timezone?
Queensland does not observe daylight saving time, staying on AEST year-round. Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
When is it midnight in IRST, what time is it in Sydney?
When it is 12:00 AM (midnight) in IRST (IRST), it is +6h 30m later in Sydney (AEST).
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