What is the time difference between Delhi and Tehran?

Tehran is 2 hours behind Delhi. 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 Delhi?

Between 11:00–18:00 in Delhi, which is 09:00–16:00 in Tehran. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does Delhi observe daylight saving time?

No. Delhi stays on UTC+5:30 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 Delhi, what time is it in Tehran?

It is 10:00 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 Delhi and Tehran use?

Delhi uses Asia/Kolkata, currently UTC+5:30 (IST), 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 Delhi time to Tehran time

Right now Tehran runs 2 hours behind Delhi. 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 Delhi, and what the clock reads in Tehran at that same moment.

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

Daylight saving time

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

Delhi

Does not observe daylight saving time

Standard: UTC+5:30

Tehran

Does not observe daylight saving time

Standard: UTC+3:30

When you can actually talk

You have 7 hours of shared working time: 11:00–18:00 in Delhi, which is 09:00–16:00 in Tehran.

Delhi 11:00–18:00Tehran 09:00–16:00

Reference

The zone identifiers and offsets behind everything above.

	Delhi	Tehran
IANA zone	Asia/Kolkata	Asia/Tehran
Abbreviation	IST	UTC+3:30
Standard offset	UTC+5:30	UTC+3:30
Daylight offset	—	—
Clock changes this year	0	0
Country	India	Iran

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

Common questions

What is the time difference between Delhi and Tehran?: Tehran is 2 hours behind Delhi. 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 Delhi?: Between 11:00–18:00 in Delhi, which is 09:00–16:00 in Tehran. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does Delhi observe daylight saving time?: No. Delhi stays on UTC+5:30 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 Delhi, what time is it in Tehran?: It is 10:00 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 Delhi and Tehran use?: Delhi uses Asia/Kolkata, currently UTC+5:30 (IST), and Tehran uses Asia/Tehran, currently UTC+3:30. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.