IST to IRT Time Converter

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

Mumbai · India Standard Time
21:33:16
Wednesday, May 13, 2026
GMT+5:30 · UTC+05:30
Tehran · Iran Standard Time
19:33:16
Wednesday, May 13, 2026
GMT+3:30 · UTC+03:30

Convert a specific time

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

Daylight Saving status right now

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

When can IST and IRT meet?

00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
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23
IST
IRT
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Mumbai (IST). 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: 11:00–16:00 IST (09:00–14:00 IRT).

Hour-by-hour IST to IRT conversion table

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

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
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

Sun today in Mumbai and Tehran

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

Related converters

IRT to IST (reverse)IST to ESTIST to PSTIST to GMTIST to UTCIST to CETEST to IRTPST to IRTGMT to IRTUTC to IRTCET to IRT
Looking for local time? See time in Mumbai or time in Tehran.

Frequently asked questions

What is the time difference between IST and IRT right now?+
IRT (Iran Standard Time) is currently 2 hours behind IST (India Standard Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does IST or IRT observe daylight saving time?+
IST: does not observe daylight saving time. IRT: does not observe daylight saving time.
When is the best time to schedule a meeting between IST and IRT?+
The strongest overlap is 11:00–16:00 IST (09:00–14:00 IRT), giving 6 hours when both sides are within standard 9am-5pm working hours.
What time is it in Tehran when it is 12:00 noon in Mumbai?+
When it is 12:00 Wed in Mumbai (IST), it is 10:00 Wed in Tehran (IRT).
Which IANA time zone identifiers are used for IST and IRT?+
IST maps to "Asia/Kolkata" in the IANA database. IRT maps to "Asia/Tehran". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is Mumbai ahead of or behind Tehran?+
Whether Mumbai (IST) is ahead of or behind Tehran (IRT) depends on the current UTC offsets. Right now IRT is 2 hours behind IST. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for IST and IRT?+
IST is UTC+05:30 (GMT+5:30) and IRT is UTC+03:30 (GMT+3:30). 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 IST and IRT?+
Yes. There are 6 hours of overlap during standard 9am-5pm working hours, with the strongest window at 11:00–16:00 IST.