Sydney to Tehran
-6h 30mSydney
AESTSOURCETehran
IRSTGreen rows indicate typical business hours (9 AM - 5 PM)
AEST and IRST on the World Map
The map below highlights the AEST (Australian Eastern Standard Time) and IRST (Iran Standard Time) timezone regions across the globe.
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.
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.
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.
About Tehran
WikipediaTehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.
Iran Standard Time (IRST) is one of few timezones with a 30-minute offset (UTC+3:30).
Understanding the -6h 30m Gap: Sydney vs Tehran
Sydney runs on Australian Eastern Standard Time (AEST) at UTC+10:00. Tehran runs on Iran Standard Time (IRST) at UTC+03:30. That puts Sydney 6 hours 30 minutes behind Tehran — a difference of -6h 30m at the current offsets.
In practice, when it is 9:00 AM in Sydney it is 2:30 AM in Tehran. Midnight in Sydney is 5:30 PM in Tehran. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Sydney to Tehran time conversion table
| Sydney (AEST) | Tehran (IRST) | Day |
|---|---|---|
| 12:00 AM | 5:30 PM | previous day |
| 6:00 AM | 11:30 PM | previous day |
| 7:00 AM | 12:30 AM | same day |
| 8:00 AM | 1:30 AM | same day |
| 9:00 AM | 2:30 AM | same day |
| 12:00 PM | 5:30 AM | same day |
| 3:00 PM | 8:30 AM | same day |
| 5:00 PM | 10:30 AM | same day |
| 6:00 PM | 11:30 AM | same day |
| 9:00 PM | 2:30 PM | same day |
Why people convert Sydney to Tehran time
- Scheduling a call from Sydney to Tehran: a 10:00 AM start in Sydney lands at 3:30 AM in Tehran, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Sydney and Tehran are inside the 9-to-5 working day between 3:30 PM and 5:00 PM AEST time (9:00 AM–10:30 AM IRST). That is roughly 1 hours 30 minutes of usable overlap.
- Watching a live event or market open: Sydney viewers need 2:30 AM in Tehran to catch a 9:00 AM start there, and 6:30 AM if the event is anchored to Sydney.
- Always state the zone abbreviation, not just the hour. "3:00 PM AEST" is unambiguous; "3 PM" across a -6h 30m gap is not.
- Block 3:30 PM–5:00 PM AEST as the recurring meeting window if you work primarily from Sydney and need Tehran colleagues present.
- Sydney: Clocks spring forward on Sat, Oct 3, 2026. Re-check this page after that date because the offset changes and so does the -6h 30m gap.
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.
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 Sydney and Tehran
Both Sydney and Tehran sit inside the 9 AM – 5 PM working day between 3:30 PM–5:00 PM AEST, which is 9:00 AM–10:30 AM IRST. That gives roughly 1 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Sydney and Tehran overlap for only 90 minutes (3:30 PM–5:00 PM AEST), so meetings have to be booked precisely.
Sydney is 6 hours 30 minutes behind Tehran (AEST UTC+10:00 → IRST UTC+03:30). The shared working window is 3:30 PM–5:00 PM AEST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Sydney
❄ Currently in Standard Time
Standard: UTC+10:00 · DST: UTC+11:00
Clocks spring forward on Sat, Oct 3, 2026
Tehran
Does not observe DST
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 Sydney and Tehran?
Sydney (AEST, UTC+10:00) is 6 hours 30 minutes behind Tehran (IRST, UTC+03:30). The gap is currently -6h 30m.
How do I convert Sydney time to Tehran time?
Add -6h 30m to Sydney local time. For example, 9:00 AM in Sydney is 2:30 AM in Tehran.
What time is it in Tehran right now?
Tehran 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 -6h 30m offset from Sydney.
What is the best time to call Tehran from Sydney?
Call between 3:30 PM and 5:00 PM AEST — that maps to 9:00 AM–10:30 AM IRST and keeps both parties inside the working day.
Which is behind, Sydney or Tehran?
Sydney is 6 hours 30 minutes behind Tehran. When it is 12:00 PM in Sydney it is 5:30 AM in Tehran.
Do Sydney and Tehran use different time zones?
Sydney (Australia) uses AEST at UTC+10:00, while Tehran (Iran) uses IRST at UTC+03:30. The IANA identifiers are Australia/Sydney and Asia/Tehran.
Does daylight saving time affect the Sydney–Tehran difference?
Neither zone observes daylight saving time, so the -6h 30m offset between Sydney and Tehran is fixed all year.
Which other cities share Sydney's time zone?
AEST also covers Sydney, Melbourne, Brisbane, Canberra, Hobart, Gold Coast.
Which countries use AEST, Sydney's zone?
AEST is used in Australia (NSW, VIC, QLD, TAS, ACT), Papua New Guinea.
Is there a day difference between Sydney and Tehran?
Not normally. The -6h 30m gap only pushes the date over the previous day.
What is the time difference between Sydney and Tehran?
Tehran is -6h 30m from Sydney.
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 timezone is Tehran in?
Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.
What are the business hours in Sydney?
Standard business hours in Sydney are 9:00 AM - 5:00 PM AEST.
What are the business hours in Tehran?
Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.
What is the best time to schedule a call between Sydney and Tehran?
The best overlap for a call is when both cities are in business hours. Sydney works 9:00 AM - 5:00 PM AEST and Tehran works 8:00 AM - 4:00 PM IRST (-6h 30m difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Sydney and Tehran?
Sydney uses AUD (A$) while Tehran uses IRR (﷼). Check current exchange rates when planning travel or business between these cities.
How do Sydney and Tehran compare in size?
Sydney has a population of approximately 5.4 million (metro: 5.4 million), while Tehran has approximately 9.4 million (metro: 16.8 million).
What are the major landmarks in Sydney and Tehran?
Sydney is known for Sydney Opera House, Sydney Harbour Bridge, Bondi Beach. Tehran is famous for Azadi Tower, Golestan Palace, Grand Bazaar.
Do Sydney and Tehran have stock exchanges?
Yes. Sydney has the ASX (Australian Securities Exchange) and Tehran has the TSE (Tehran Stock Exchange). The -6h 30m time difference affects trading hour overlaps between these exchanges.
Which countries use AEST (Australian Eastern Standard Time)?
AEST is used in Australia (NSW, VIC, QLD, TAS, ACT), Papua New Guinea.
Does AEST observe daylight saving time?
Yes, AEST switches to AEDT during summer months.
What are some interesting facts about AEST?
Queensland does not observe daylight saving time, staying on AEST year-round. Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
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 Sydney, what time is it in Tehran?
When it is 12:00 AM (midnight) in Sydney (AEST), it is -6h 30m later in Tehran (IRST).
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