Tehran to Delhi
+2hTehran
IRSTSOURCEDelhi
ISTGreen rows indicate typical business hours (9 AM - 5 PM)
IRST and IST on the World Map
The map below highlights the IRST (Iran Standard Time) and IST (India Standard Time) timezone regions across the globe.
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.
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.
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).
About Delhi
WikipediaDelhi operates on India Standard Time (IST), UTC+5:30. As India's capital, Delhi time is synchronized with Mumbai and India's National Stock Exchange.
Delhi serves as India's political capital while Mumbai is the financial capital.
Understanding the +2h Gap: Tehran vs Delhi
Tehran runs on Iran Standard Time (IRST) at UTC+03:30. Delhi runs on India Standard Time (IST) at UTC+05:30. That puts Tehran 2 hours ahead of Delhi — a difference of +2h at the current offsets.
In practice, when it is 9:00 AM in Tehran it is 11:00 AM in Delhi. Midnight in Tehran is 2:00 AM in Delhi. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Tehran to Delhi time conversion table
| Tehran (IRST) | Delhi (IST) | Day |
|---|---|---|
| 12:00 AM | 2:00 AM | same day |
| 6:00 AM | 8:00 AM | same day |
| 7:00 AM | 9:00 AM | same day |
| 8:00 AM | 10:00 AM | same day |
| 9:00 AM | 11:00 AM | same day |
| 12:00 PM | 2:00 PM | same day |
| 3:00 PM | 5:00 PM | same day |
| 5:00 PM | 7:00 PM | same day |
| 6:00 PM | 8:00 PM | same day |
| 9:00 PM | 11:00 PM | same day |
Why people convert Tehran to Delhi time
- Scheduling a call from Tehran to Delhi: a 10:00 AM start in Tehran lands at 12:00 PM in Delhi, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Tehran and Delhi are inside the 9-to-5 working day between 9:00 AM and 3:00 PM IRST time (11:00 AM–5:00 PM IST). That is roughly 6 hours of usable overlap.
- Coordinating a Tehran-based team with Delhi contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a +2h gap is not.
- Block 9:00 AM–3:00 PM IRST as the recurring meeting window if you work primarily from Tehran and need Delhi colleagues present.
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.
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.
Best time to call between Tehran and Delhi
Both Tehran and Delhi sit inside the 9 AM – 5 PM working day between 9:00 AM–3:00 PM IRST, which is 11:00 AM–5:00 PM IST. That gives roughly 6 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Tehran and Delhi share 6 hours of working-hours overlap (9:00 AM–3:00 PM IRST), so scheduling a live meeting is straightforward.
Tehran is 2 hours ahead of Delhi (IRST UTC+03:30 → IST UTC+05:30). The shared working window is 9:00 AM–3:00 PM IRST. Remember to re-check around daylight-saving transitions.
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 Tehran and Delhi?
Tehran (IRST, UTC+03:30) is 2 hours ahead of Delhi (IST, UTC+05:30). The gap is currently +2h.
How do I convert Tehran time to Delhi time?
Add +2h to Tehran local time. For example, 9:00 AM in Tehran is 11:00 AM in Delhi.
What time is it in Delhi right now?
Delhi uses IST at UTC+05:30. Use the live converter at the top of this page — it updates in real time and already accounts for the +2h offset from Tehran.
What is the best time to call Delhi from Tehran?
Call between 9:00 AM and 3:00 PM IRST — that maps to 11:00 AM–5:00 PM IST and keeps both parties inside the working day.
Which is ahead, Tehran or Delhi?
Tehran is 2 hours ahead of Delhi. When it is 12:00 PM in Tehran it is 2:00 PM in Delhi.
Do Tehran and Delhi use different time zones?
Tehran (Iran) uses IRST at UTC+03:30, while Delhi (India) uses IST at UTC+05:30. The IANA identifiers are Asia/Tehran and Asia/Kolkata.
Does daylight saving time affect the Tehran–Delhi difference?
Neither zone observes daylight saving time, so the +2h offset between Tehran and Delhi is fixed all year.
Which other cities share Tehran's time zone?
IRST also covers Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.
Which countries use IRST, Tehran's zone?
IRST is used in Iran.
Is there a day difference between Tehran and Delhi?
Not normally. The +2h gap only pushes the date over for late-evening times.
What is the time difference between Tehran and Delhi?
Delhi is +2h from Tehran.
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 timezone is Delhi in?
Delhi operates on India Standard Time (IST), UTC+5:30. As India's capital, Delhi time is synchronized with Mumbai and India's National Stock Exchange.
What are the business hours in Tehran?
Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.
What are the business hours in Delhi?
Standard business hours in Delhi are 9:30 AM - 5:30 PM IST.
What is the best time to schedule a call between Tehran and Delhi?
The best overlap for a call is when both cities are in business hours. Tehran works 8:00 AM - 4:00 PM IRST and Delhi works 9:30 AM - 5:30 PM IST (+2h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Tehran and Delhi?
Tehran uses IRR (﷼) while Delhi uses INR (₹). Check current exchange rates when planning travel or business between these cities.
How do Tehran and Delhi compare in size?
Tehran has a population of approximately 9.4 million (metro: 16.8 million), while Delhi has approximately 11 million (metro: 32.9 million).
What are the major landmarks in Tehran and Delhi?
Tehran is known for Azadi Tower, Golestan Palace, Grand Bazaar. Delhi is famous for India Gate, Red Fort, Qutub Minar.
Do Tehran and Delhi have stock exchanges?
Yes. Tehran has the TSE (Tehran Stock Exchange) and Delhi has the NSE (National Stock Exchange). The +2h time difference affects trading hour overlaps between these exchanges.
Which countries use IRST (Iran Standard Time)?
IRST is used in Iran.
Does IRST observe daylight saving time?
Yes, IRST switches to IRDT during summer months.
What are some interesting facts about IRST?
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).
Which cities are in the IST timezone?
Major cities in the IST timezone include Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad.
What is the UTC offset for IST?
India Standard Time (IST) is at UTC+05:30.
What should I know about the IST timezone?
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.
When is it midnight in Tehran, what time is it in Delhi?
When it is 12:00 AM (midnight) in Tehran (IRST), it is +2h later in Delhi (IST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More Tehran time conversions
- tehran to irst
- tehran to iran
- tehran to dubai
- tehran to mumbai
- tehran to bangalore
- tehran to kathmandu
- tehran to bangkok
- tehran to singapore
- tehran to hong kong
- tehran to shanghai
- tehran to beijing
- tehran to tokyo
- tehran to osaka
- tehran to new york
- tehran to london
- tehran to sydney
- tehran to los angeles
- tehran to paris
- tehran to berlin
- tehran to toronto
- new york to tehran
- london to tehran
- dubai to tehran
- tokyo to tehran
- singapore to tehran
- sydney to tehran
- los angeles to tehran
- paris to tehran
- delhi to tehran
- mumbai to tehran
- berlin to tehran
- hong kong to tehran
- toronto to tehran
- kathmandu to tehran
See every conversion from Tehran →·See every conversion from Delhi →