What is the time difference between Singapore and Tehran?

Tehran is 4 hours 30 minutes behind Singapore. 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 Singapore?

Between 13:30–18:00 in Singapore, which is 09:00–13:30 in Tehran. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does Singapore observe daylight saving time?

No. Singapore stays on UTC+8 all year, so its clocks never move.

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 Singapore, what time is it in Tehran?

It is 07:30 in Tehran, on the same calendar date. That holds for the current offsets; it does not change through the year, because neither city moves its clocks.

Which time zones do Singapore and Tehran use?

Singapore uses Asia/Singapore, currently UTC+8, 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 Singapore time to Tehran time

Right now Tehran runs 4 hours 30 minutes behind Singapore. That gap is not fixed: it moves when either city changes its clocks.

Convert a time

From

Date

Time

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

Every hour of a day in Singapore, and what the clock reads in Tehran at that same moment.

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

Daylight saving time

Both cities keep one offset all year. Whatever difference holds today still holds in six months.

Singapore

Does not observe daylight saving time

Standard: UTC+8

Tehran

Does not observe daylight saving time

Standard: UTC+3:30

When you can actually talk

The window is 4 hours 30 minutes wide — 13:30–18:00 in Singapore, 09:00–13:30 in Tehran.

Singapore 13:30–18:00Tehran 09:00–13:30

Reference

The zone identifiers and offsets behind everything above.

	Singapore	Tehran
IANA zone	Asia/Singapore	Asia/Tehran
Abbreviation	UTC+8	UTC+3:30
Standard offset	UTC+8	UTC+3:30
Daylight offset	—	—
Clock changes this year	0	0
Country	Singapore	Iran

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

Common questions

What is the time difference between Singapore and Tehran?: Tehran is 4 hours 30 minutes behind Singapore. 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 Singapore?: Between 13:30–18:00 in Singapore, which is 09:00–13:30 in Tehran. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does Singapore observe daylight saving time?: No. Singapore stays on UTC+8 all year, so its clocks never move.
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 Singapore, what time is it in Tehran?: It is 07:30 in Tehran, on the same calendar date. That holds for the current offsets; it does not change through the year, because neither city moves its clocks.
Which time zones do Singapore and Tehran use?: Singapore uses Asia/Singapore, currently UTC+8, and Tehran uses Asia/Tehran, currently UTC+3:30. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.