Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

IRST to AEST

+6h 30m

IRST

IRSTSOURCE

UTC+03:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

AEST

UTC+10:00DST observed

HH06

MM30

18:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

IRST

AEST

12:00 AM

6:30 AM

2:00 AM

8:30 AM

4:00 AM

10:30 AM

6:00 AM

12:30 PM

8:00 AM

2:30 PM

10:00 AM

4:30 PM

12:00 PM

6:30 PM

2:00 PM

8:30 PM

4:00 PM

10:30 PM

6:00 PM

12:30 AM+1

8:00 PM

2:30 AM+1

10:00 PM

4:30 AM+1

Green 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 Zone

→

AEST Zone

Explore all world timezones interactively →

IRST – Iran Standard Time

UTC+03:30

Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.

Countries in IRST

Iran

Major Cities in IRST

TehranIsfahanMashhadTabrizShirazKaraj

Key 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).
•Tehran has a metropolitan population of over 16 million.

Daylight Saving:Yes – switches to IRDT

Learn more about IRST on Wikipedia

AEST – Australian Eastern Standard Time

UTC+10:00

Australian Eastern Standard Time (AEST) covers eastern Australia, 10 hours ahead of UTC.

Countries in AEST

Australia (NSW, VIC, QLD, TAS, ACT)Papua New Guinea

Major Cities in AEST

SydneyMelbourneBrisbaneCanberraHobartGold Coast

Key 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.
•The Australian Securities Exchange (ASX) operates on AEST/AEDT.
•AEST is 15 hours ahead of EST during winter.

Daylight Saving:Yes – switches to AEDT

Learn more about AEST on Wikipedia

Comparing Time Zones: IRST and AEST

IRST runs on Iran Standard Time (IRST) at UTC+03:30. AEST runs on Australian Eastern Standard Time (AEST) at UTC+10:00. That puts IRST 6 hours 30 minutes ahead of AEST — 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 AEST. Midnight in IRST is 6:30 AM in AEST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

IRST to AEST time conversion table

IRST (IRST)	AEST (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 AEST time

Scheduling a call from IRST to AEST: a 10:00 AM start in IRST lands at 4:30 PM in AEST, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both IRST and AEST 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.
Coordinating a IRST-based team with AEST contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.

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 AEST 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 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 AEST

Both IRST and AEST 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 AEST 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 AEST (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

AEST

❄ 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:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between IRST and AEST?

IRST (IRST, UTC+03:30) is 6 hours 30 minutes ahead of AEST (AEST, UTC+10:00). The gap is currently +6h 30m.

How do I convert IRST time to AEST time?

Add +6h 30m to IRST local time. For example, 9:00 AM in IRST is 3:30 PM in AEST.

What time is it in AEST right now?

AEST 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.