What is the time difference between Tehran and Delhi?

Delhi is 2 hours ahead of Tehran. 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 Delhi from Tehran?

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

Does Tehran observe daylight saving time?

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

Does Delhi observe daylight saving time?

No. Delhi stays on UTC+5:30 all year, so its clocks never move.

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

It is 14:00 in Delhi, 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 Tehran and Delhi use?

Tehran uses Asia/Tehran, currently UTC+3:30, and Delhi uses Asia/Kolkata, currently UTC+5:30 (IST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert Tehran time to Delhi time

Delhi is 2 hours ahead of Tehran right now, so midday in Tehran lands in the afternoon in Delhi.

Convert a time

From

Date

Time

Converted time

—

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 Tehran, across for Delhi.

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

Daylight saving time

Neither Tehran nor Delhi changes its clocks, so the difference between them is the same every day of the year.

Tehran

Does not observe daylight saving time

Standard: UTC+3:30

Delhi

Does not observe daylight saving time

Standard: UTC+5:30

When you can actually talk

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

Tehran 09:00–16:00Delhi 11:00–18:00

Reference

The underlying data, in case you need to put it in a calendar invitation or a configuration file.

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

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

Common questions

What is the time difference between Tehran and Delhi?: Delhi is 2 hours ahead of Tehran. 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 Delhi from Tehran?: Between 09:00–16:00 in Tehran, which is 11:00–18:00 in Delhi. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does Tehran observe daylight saving time?: No. Tehran stays on UTC+3:30 all year, so its clocks never move.
Does Delhi observe daylight saving time?: No. Delhi stays on UTC+5:30 all year, so its clocks never move.
If it is midday in Tehran, what time is it in Delhi?: It is 14:00 in Delhi, 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 Tehran and Delhi use?: Tehran uses Asia/Tehran, currently UTC+3:30, and Delhi uses Asia/Kolkata, currently UTC+5:30 (IST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.