Does Sydney observe daylight saving time?

Yes. Sydney is on AEDT (UTC+11) now, and its clocks go back 1 hour on Sun, Apr 4, 2027, to AEST (UTC+10).

Does Tehran observe daylight saving time?

No. Tehran stays on IRST (UTC+3:30) all year, so its clocks don't change.

What time is it in Tehran when it's 9 AM in Sydney?

1:30 AM in Tehran, on the same day.

Sydney to Tehran Meeting Planner

Tehran is 7 hours 30 minutes behind Sydney right now. Their working days overlap for 30 minutes today.

Sydney · Australia

12:38 PM

Sun, Oct 18 · AEDT · summer time

Tehran · Iran

5:08 AM

Sun, Oct 18 · IRST

Best Meeting Times Between Sydney and Tehran

4:30 PM to 5:00 PM in Sydney (9:00 AM to 9:30 AM in Tehran). That's when both cities are inside working hours, 9 AM to 5 PM, giving 30 minutes of overlap today.

Who's meeting

2 of 4 places

SydneyOrganizerAustralia ·· summer time12:38PMnow
TehranIran ·5:08AMnow

Add a city

Add up to 4 places by city, country, time zone or abbreviation, like Tokyo, India or JST. Press "/" to jump here.

Date in Sydney

Working hours, everywhere

Best times to meet

Sunday, October 18, 2026, in Sydney time.

4:30PMBest · OptimalWorking hours in Sydney (16:30) and Tehran (09:00).
2:30PMOption 2 · GoodWorking hours in Sydney (14:30); just outside working hours in Tehran (07:00).
3:00PMOption 3 · GoodWorking hours in Sydney (15:00); just outside working hours in Tehran (07:30).

The whole day

Pick any slot in the Fit row, or use the arrow keys there, to make it the meeting time.

Each column is a half hour of the first place's day. The Fit row grades how well the slot suits everyone; each row shows the local time and whether it's working hours there.
Fit
SydneyAEDT
TehranUTC+3:30
UTC	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12

Working hours (09–17)Just outside (07–09, 17–20)Late evening (20–23)NightFit: optimal, good, possible, poor

Your meeting

Sydney4:30 PM AEDTSun, Oct 18
Tehran9:00 AM UTC+3:30Sun, Oct 18
UTC2026-10-18 05:30 UTC

What will it cost? Try the meeting cost calculator.

Time difference between Sydney and Tehran

Tehran is 7 hours 30 minutes behind Sydney right now: Tehran is on IRST (UTC+3:30) and Sydney on AEDT (UTC+11). That changes on Sun, Apr 4, 2027, when clocks go back in Sydney: then Tehran is 6 hours 30 minutes behind Sydney.

Time difference between Sydney and Tehran over the next 12 months
From	Difference	Why
Now	Tehran 7 hours 30 minutes behind	—
Sun, Apr 4, 2027	Tehran 6 hours 30 minutes behind	Clocks go back in Sydney
Sun, Oct 3, 2027	Tehran 7 hours 30 minutes behind	Clocks go forward in Sydney

Sydney is on Australian Eastern Standard Time. Tehran is on Iran Standard Time.

Frequently Asked Questions: Sydney & Tehran Scheduling

What is the time difference between Sydney and Tehran?: Tehran is 7 hours 30 minutes behind Sydney right now: Tehran is on IRST (UTC+3:30) and Sydney on AEDT (UTC+11). That changes on Sun, Apr 4, 2027, when clocks go back in Sydney: then Tehran is 6 hours 30 minutes behind Sydney.
What is the best time to schedule a meeting between Sydney and Tehran?: 4:30 PM to 5:00 PM in Sydney (9:00 AM to 9:30 AM in Tehran). That's when both cities are inside working hours, 9 AM to 5 PM, giving 30 minutes of overlap today.
Does Sydney observe daylight saving time?: Yes. Sydney is on AEDT (UTC+11) now, and its clocks go back 1 hour on Sun, Apr 4, 2027, to AEST (UTC+10).
Does Tehran observe daylight saving time?: No. Tehran stays on IRST (UTC+3:30) all year, so its clocks don't change.
What time is it in Tehran when it's 9 AM in Sydney?: 1:30 AM in Tehran, on the same day.

Or see every city pair, or plan with more places in the meeting planner.