IST to Tehran
-2hIST
ISTSOURCETehran
IRSTGreen rows indicate typical business hours (9 AM - 5 PM)
IST and IRST on the World Map
The map below highlights the IST (India Standard Time) and IRST (Iran Standard Time) timezone regions across the globe.
IST – India Standard Time
UTC+05:30India Standard Time (IST) is the time zone for India and Sri Lanka, 5 hours and 30 minutes ahead of UTC.
- •India is 10 hours 30 minutes ahead of EST and 5 hours 30 minutes ahead of GMT.
- •India uses a single time zone despite spanning 30° of longitude.
- •IST is one of only a handful of time zones with a 30-minute offset.
- •IST is the most populous single time zone in the world with over 1.4 billion people.
- •The Bombay Stock Exchange (BSE) and National Stock Exchange (NSE) operate on IST.
IRST – Iran Standard Time
UTC+03:30Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.
- •IRST is one of only a few time zones with a 30-minute offset.
- •Iran observes daylight saving time, switching to IRDT (UTC+04:30).
- •Tehran has a metropolitan population of over 16 million.
About Tehran
WikipediaTehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.
Iran Standard Time (IRST) is one of few timezones with a 30-minute offset (UTC+3:30).
Comparing Time Zones: IST and Tehran
IST (India Standard Time) operates on the India Standard Time (UTC+05:30). Tehran, Iran uses Iran Standard Time (UTC+03:30).
The time difference between IST and Tehran is 120 minutes (+2h). When it's noon in IST, it's 10:00 AM in Tehran.
Why Convert IST to Tehran Time?
The time difference of 2 hours between IST and Tehran can significantly impact business operations and personal communication. By using this converter, you can easily find the overlapping business hours and schedule your interactions when both parties are available.
Quick Tip: Use calendar apps that automatically adjust for time zones when sending invites from IST to Tehran. This ensures everyone sees the correct time for their location.
About IST (India Standard Time)
India Standard Time (IST) is the time observed throughout India and Sri Lanka. It is based on the 82.5°E meridian, passing through Mirzapur in Uttar Pradesh. India uses a single time zone despite spanning roughly 30° of longitude, which has been debated. IST does not observe daylight saving time. India is the world's most populous country, making IST one of the most-used time zones globally. The IT outsourcing industry and call centers operate primarily on IST, making the EST-to-IST conversion one of the most searched timezone conversions.
About IRST (Iran Standard Time)
Iran Standard Time (IRST) is one of the few time zones with a 30-minute offset. Iran observes daylight saving time (IRDT, UTC+04:30) from late March to late September. Tehran, the capital, is one of the largest cities in the Middle East.
Best Time to Call Between IST and Tehran
If you want to reach someone in Tehran during standard business hours (9 AM – 5 PM IRST), the best time to call from IST would be:
- Tehran 9:00 AM = IST 11:00 AM
- Tehran 12:00 PM = IST 02:00 PM
- Tehran 5:00 PM = IST 07:00 PM
Business Hours Overlap
IST and Tehran have a significant business hours overlap (6 hours), making real-time collaboration easy during standard working hours.
Ultimately, understanding the -2h difference between IST and Tehran empowers you to coordinate better. Whether for business or personal reasons, this tool ensures you're always on time.
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between IST and Tehran?
Tehran is -2h from IST.
What timezone is IST in?
IST operates on its local timezone.
What timezone is Tehran in?
Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.
What are the business hours in Tehran?
Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.
Which countries use IST (India Standard Time)?
IST is used in India, Sri Lanka.
Does IST observe daylight saving time?
No, IST does not observe daylight saving time and remains at UTC+05:30 year-round.
What are some interesting facts about IST?
India is 10 hours 30 minutes ahead of EST and 5 hours 30 minutes ahead of GMT. India uses a single time zone despite spanning 30° of longitude.
Which cities are in the IRST timezone?
Major cities in the IRST timezone include Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.
What is the UTC offset for IRST?
Iran Standard Time (IRST) is at UTC+03:30. During daylight saving time, it shifts to IRDT.
What should I know about the IRST timezone?
IRST is one of only a few time zones with a 30-minute offset. Iran observes daylight saving time, switching to IRDT (UTC+04:30).
When is it midnight in IST, what time is it in Tehran?
When it is 12:00 AM (midnight) in IST (IST), it is -2h later in Tehran (IRST).
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