TimeToZone

IST to Tehran Time Converter

IRST is 2 hours behind IST. 9:00 AM IST = 7:00 AM IRST.

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ISTfrom
India Standard Time
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Tehran
Tehran, Iran
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IRST is 2 hours behind IST. To convert IST to Tehran Time, subtract 2 hours from the IST time: 9:00 AM IST = 7:00 AM IRST.

IST (India Time) is used in India and Sri Lanka (UTC+5:30, no daylight saving time). Tehran Time (Tehran time) is used in Tehran, Iran.

IST here means India Standard Time, not Irish or Israel Standard Time.

IST to Tehran Time time conversion table

IST to Tehran Time on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.

ISTTehran TimeDay
12:00 AM IST10:00 PM IRSTprevious day
1:00 AM IST11:00 PM IRSTprevious day
2:00 AM IST12:00 AM IRSTnight
3:00 AM IST1:00 AM IRSTnight
4:00 AM IST2:00 AM IRSTnight
5:00 AM IST3:00 AM IRSTnight
6:00 AM IST4:00 AM IRSTnight
7:00 AM IST5:00 AM IRSTnight
8:00 AM IST6:00 AM IRST—
9:00 AM IST7:00 AM IRST—
10:00 AM IST8:00 AM IRST—
11:00 AM IST9:00 AM IRSTwork hours
12:00 PM IST10:00 AM IRSTwork hours
1:00 PM IST11:00 AM IRSTwork hours
2:00 PM IST12:00 PM IRSTwork hours
3:00 PM IST1:00 PM IRSTwork hours
4:00 PM IST2:00 PM IRSTwork hours
5:00 PM IST3:00 PM IRST—
6:00 PM IST4:00 PM IRST—
7:00 PM IST5:00 PM IRST—
8:00 PM IST6:00 PM IRST—
9:00 PM IST7:00 PM IRST—
10:00 PM IST8:00 PM IRST—
11:00 PM IST9:00 PM IRST—
  • Work rows — 9 AM–5 PM in both places
  • Night in the destination (10 PM–6 AM)

How to convert IST to Tehran Time

Subtract 2 hours from the IST time to get Tehran Time.

Example: 9:00 AM IST = 7:00 AM IRST.

Across midnight: 1:00 AM IST = 11:00 PM IRST (previous day). The date changes, so always check the day as well as the hour.

Time difference between IST and Tehran Time

The time difference between IST and Tehran Time is 2 hours all year – IRST is behind IST.

IST and Tehran Time during daylight saving time

  • IST does not observe daylight saving time; it stays on UTC+5:30 all year.
  • Tehran Time does not observe daylight saving time; it stays on UTC+3:30 all year.

Best time for a meeting between IST and Tehran Time

IST and Tehran Time share 6 hours of the 9 AM–5 PM working day. Any time between 11:00 AM and 5:00 PM IST lands between 9:00 AM and 3:00 PM IRST, inside working hours for both.

Plan a meeting across more time zones.

IST to Tehran Time FAQ

What is the time difference between IST and Tehran Time?

IRST is 2 hours behind IST all year. 9:00 AM IST = 7:00 AM IRST.

What is 9 AM IST in Tehran Time?

9:00 AM IST is 7:00 AM IRST.

What is 12 PM (noon) IST in Tehran Time?

12:00 PM IST is 10:00 AM IRST.

Is Tehran Time ahead of or behind IST?

IRST is 2 hours behind IST, so it is earlier in Tehran Time than in IST.

Does IST change for daylight saving time?

No. IST stays on the same offset all year, so conversions never shift for daylight saving time.

Does Tehran Time change for daylight saving time?

No. Tehran Time stays on the same offset all year, so conversions never shift for daylight saving time.

What is the best time for a meeting between IST and Tehran Time?

IST and Tehran Time share 6 hours of the 9 AM–5 PM working day. Any time between 11:00 AM and 5:00 PM IST lands between 9:00 AM and 3:00 PM IRST, inside working hours for both.

Related conversions

Convert Tehran Time to IST

Convert IST to other time zones

Convert other time zones to Tehran Time

Learn more

Updated 7 November 2026. Time zone data: IANA tz database.