What is the time difference between Sydney and Tehran?

Tehran is 6 hours 30 minutes behind Sydney. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call Tehran from Sydney?

Between 15:30–18:00 in Sydney, which is 09:00–11:30 in Tehran. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does Sydney observe daylight saving time?

Yes. Sydney runs on UTC+10 in winter and UTC+11 in summer. The next change is on 2026-10-04, when clocks go forward by 60 minutes.

Does Tehran observe daylight saving time?

No. Tehran stays on UTC+3:30 all year, so its clocks never move.

If it is midday in Sydney, what time is it in Tehran?

It is 05:30 in Tehran, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.

Which time zones do Sydney and Tehran use?

Sydney uses Australia/Sydney, currently UTC+10 (AEST), and Tehran uses Asia/Tehran, currently UTC+3:30. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert Sydney time to Tehran time

Tehran is 6 hours 30 minutes behind Sydney right now, so midday in Sydney lands in the small hours in Tehran.

Convert a time

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Date

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Converted time

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The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

The whole day mapped across: read down the left for Sydney, across for Tehran.

Sydney	Tehran
00:00	17:30previous day
01:00	18:30previous day
02:00	19:30previous day
03:00	20:30previous day
04:00	21:30previous day
05:00	22:30previous day
06:00	23:30previous day
07:00	00:30
08:00	01:30
09:00	02:30
10:00	03:30
11:00	04:30
12:00	05:30
13:00	06:30
14:00	07:30
15:00	08:30
16:00	09:30
17:00	10:30
18:00	11:30
19:00	12:30
20:00	13:30
21:00	14:30
22:00	15:30
23:00	16:30

Daylight saving time

Tehran keeps one offset all year while Sydney moves twice. That is the whole reason this difference is seasonal.

Sydney

Observes daylight saving time

Standard: UTC+10
Daylight: UTC+11
Next change: 2026-10-04 +60m

Tehran

Does not observe daylight saving time

Standard: UTC+3:30

When you can actually talk

The window is 2 hours 30 minutes wide — 15:30–18:00 in Sydney, 09:00–11:30 in Tehran.

Sydney 15:30–18:00Tehran 09:00–11:30

Reference

The zone identifiers and offsets behind everything above.

	Sydney	Tehran
IANA zone	Australia/Sydney	Asia/Tehran
Abbreviation	AEST	UTC+3:30
Standard offset	UTC+10	UTC+3:30
Daylight offset	UTC+11	—
Clock changes this year	2	0
Country	Australia	Iran

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between Sydney and Tehran?: Tehran is 6 hours 30 minutes behind Sydney. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.
When is the best time to call Tehran from Sydney?: Between 15:30–18:00 in Sydney, which is 09:00–11:30 in Tehran. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does Sydney observe daylight saving time?: Yes. Sydney runs on UTC+10 in winter and UTC+11 in summer. The next change is on 2026-10-04, when clocks go forward by 60 minutes.
Does Tehran observe daylight saving time?: No. Tehran stays on UTC+3:30 all year, so its clocks never move.
If it is midday in Sydney, what time is it in Tehran?: It is 05:30 in Tehran, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.
Which time zones do Sydney and Tehran use?: Sydney uses Australia/Sydney, currently UTC+10 (AEST), and Tehran uses Asia/Tehran, currently UTC+3:30. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.