IRT to IST Time Converter

Convert Iran Standard Time (IRT) to India Standard Time (IST). Both time zones are shown live below; current offset between them is 2 hours ahead.

Tehran · Iran Standard Time
02:41:20
Wednesday, May 13, 2026
GMT+3:30 · UTC+03:30
Mumbai · India Standard Time
04:41:20
Wednesday, May 13, 2026
GMT+5:30 · UTC+05:30

Convert a specific time

From: IRT (Tehran)
To: IST (Mumbai)
--:--

Daylight Saving status right now

IRT (Iran Standard Time)
Observes DST
No
IST (India Standard Time)
Observes DST
No

When can IRT and IST meet?

00
01
02
03
04
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09
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IRT
IST
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Tehran (IRT). Each row shows the local working-hours state in that zone for the same moment in time.
6 hours of overlap during standard 9am-5pm working hours.
Best meeting window: 09:00–14:00 IRT (11:00–16:00 IST).

Hour-by-hour IRT to IST conversion table

IRT time (Tehran)IST time (Mumbai)Status
00:00 Wed02:00 WedOff-hours both sides
01:00 Wed03:00 WedOff-hours both sides
02:00 Wed04:00 WedOff-hours both sides
03:00 Wed05:00 WedOff-hours both sides
04:00 Wed06:00 WedOff-hours both sides
05:00 Wed07:00 WedOff-hours both sides
06:00 Wed08:00 WedOff-hours both sides
07:00 Wed09:00 WedIST working
08:00 Wed10:00 WedIST working
09:00 Wed11:00 WedBoth at work
10:00 Wed12:00 WedBoth at work
11:00 Wed13:00 WedBoth at work
12:00 Wed14:00 WedBoth at work
13:00 Wed15:00 WedBoth at work
14:00 Wed16:00 WedBoth at work
15:00 Wed17:00 WedIRT working
16:00 Wed18:00 WedIRT working
17:00 Wed19:00 WedOff-hours both sides
18:00 Wed20:00 WedOff-hours both sides
19:00 Wed21:00 WedOff-hours both sides
20:00 Wed22:00 WedOff-hours both sides
21:00 Wed23:00 WedOff-hours both sides
22:00 Wed00:00 ThuOff-hours both sides
23:00 Wed01:00 ThuOff-hours both sides

Times computed for today in each zone using the IANA time zone database. The conversion accounts for daylight saving time wherever applicable.

About these time zones

Iran Standard Time (IRT)
IANA identifier
Asia/Tehran
Current UTC offset
UTC+03:30
Current abbreviation
GMT+3:30
Major cities in this zone
TehranIsfahan
India Standard Time (IST)
IANA identifier
Asia/Kolkata
Current UTC offset
UTC+05:30
Current abbreviation
GMT+5:30
Major cities in this zone
MumbaiNew DelhiBangaloreChennaiKolkata

Sun today in Tehran and Mumbai

Tehran
Sunrise
05:02
Sunset
19:01
Solar noon
12:02
Daylight
13h 58m
Mumbai
Sunrise
06:06
Sunset
19:06
Solar noon
12:36
Daylight
13h 0m

Related converters

IST to IRT (reverse)IRT to ESTIRT to PSTIRT to GMTIRT to UTCIRT to CETEST to ISTPST to ISTGMT to ISTUTC to ISTCET to IST
Looking for local time? See time in Tehran or time in Mumbai.

Frequently asked questions

What is the time difference between IRT and IST right now?+
IST (India Standard Time) is currently 2 hours ahead IRT (Iran Standard Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does IRT or IST observe daylight saving time?+
IRT: does not observe daylight saving time. IST: does not observe daylight saving time.
When is the best time to schedule a meeting between IRT and IST?+
The strongest overlap is 09:00–14:00 IRT (11:00–16:00 IST), giving 6 hours when both sides are within standard 9am-5pm working hours.
What time is it in Mumbai when it is 12:00 noon in Tehran?+
When it is 12:00 Wed in Tehran (IRT), it is 14:00 Wed in Mumbai (IST).
Which IANA time zone identifiers are used for IRT and IST?+
IRT maps to "Asia/Tehran" in the IANA database. IST maps to "Asia/Kolkata". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is Tehran ahead of or behind Mumbai?+
Whether Tehran (IRT) is ahead of or behind Mumbai (IST) depends on the current UTC offsets. Right now IST is 2 hours ahead IRT. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for IRT and IST?+
IRT is UTC+03:30 (GMT+3:30) and IST is UTC+05:30 (GMT+5:30). Both offsets shift by one hour when the corresponding region enters or exits daylight saving time, so the live values on this page are the source of truth.
Can I schedule meetings during business hours for both IRT and IST?+
Yes. There are 6 hours of overlap during standard 9am-5pm working hours, with the strongest window at 09:00–14:00 IRT.