Tehran to EDT
-7h 30mTehran
IRSTSOURCEEDT
EDTGreen rows indicate typical business hours (9 AM - 5 PM)
IRST and EDT on the World Map
The map below highlights the IRST (Iran Standard Time) and EDT (Eastern Daylight 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.
EDT – Eastern Daylight Time
UTC-04:00Eastern Daylight Time (EDT) is the daylight saving time observed in the Eastern Time Zone, 4 hours behind UTC.
- •EDT is observed from the second Sunday of March to the first Sunday of November.
- •During EDT, the US East Coast is only 4 hours behind London (instead of 5).
- •Not all EST locations switch to EDT – Panama and Jamaica stay on EST year-round.
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).
Everything You Need to Know About Tehran and EDT Time
Tehran runs on Iran Standard Time (IRST) at UTC+03:30. EDT runs on Eastern Daylight Time (EDT) at UTC-04:00. That puts Tehran 7 hours 30 minutes behind EDT — a difference of -7h 30m at the current offsets.
In practice, when it is 9:00 AM in Tehran it is 1:30 AM in EDT. Midnight in Tehran is 4:30 PM in EDT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Tehran to EDT time conversion table
| Tehran (IRST) | EDT (EDT) | Day |
|---|---|---|
| 12:00 AM | 4:30 PM | previous day |
| 6:00 AM | 10:30 PM | previous day |
| 7:00 AM | 11:30 PM | previous day |
| 8:00 AM | 12:30 AM | same day |
| 9:00 AM | 1:30 AM | same day |
| 12:00 PM | 4:30 AM | same day |
| 3:00 PM | 7:30 AM | same day |
| 5:00 PM | 9:30 AM | same day |
| 6:00 PM | 10:30 AM | same day |
| 9:00 PM | 1:30 PM | same day |
Why people convert Tehran to EDT time
- Scheduling a call from Tehran to EDT: a 10:00 AM start in Tehran lands at 2:30 AM in EDT, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Tehran and EDT are inside the 9-to-5 working day between 4:30 PM and 5:00 PM IRST time (9:00 AM–9:30 AM EDT). That is roughly 0 hours 30 minutes of usable overlap.
- Watching a live event or market open: Tehran viewers need 1:30 AM in EDT to catch a 9:00 AM start there, and 7:30 AM if the event is anchored to Tehran.
- Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a -7h 30m gap is not.
- Block 4:30 PM–5:00 PM IRST as the recurring meeting window if you work primarily from Tehran and need EDT 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 EDT (Eastern Daylight Time)
Eastern Daylight Time (EDT) is used during the summer months (second Sunday of March to the first Sunday of November) in the Eastern Time Zone. During EDT, clocks are advanced by one hour to take advantage of longer daylight hours. Not all locations in the Eastern Time Zone observe DST – Panama, Jamaica, and most of the Caribbean remain on EST year-round.
Best time to call between Tehran and EDT
Both Tehran and EDT sit inside the 9 AM – 5 PM working day between 4:30 PM–5:00 PM IRST, which is 9:00 AM–9:30 AM EDT. That gives roughly 0 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Tehran and EDT overlap for only 30 minutes (4:30 PM–5:00 PM IRST), so meetings have to be booked precisely.
Tehran is 7 hours 30 minutes behind EDT (IRST UTC+03:30 → EDT UTC-04:00). The shared working window is 4:30 PM–5:00 PM IRST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Tehran
Does not observe DST
EDT
☀ Currently in DST
Standard: UTC-05:00 · DST: UTC-04:00
Clocks fall back on Sun, Nov 1, 2026
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 EDT?
Tehran (IRST, UTC+03:30) is 7 hours 30 minutes behind EDT (EDT, UTC-04:00). The gap is currently -7h 30m.
How do I convert Tehran time to EDT time?
Add -7h 30m to Tehran local time. For example, 9:00 AM in Tehran is 1:30 AM in EDT.
What time is it in EDT right now?
EDT uses EDT at UTC-04:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -7h 30m offset from Tehran.
What is the best time to call EDT from Tehran?
Call between 4:30 PM and 5:00 PM IRST — that maps to 9:00 AM–9:30 AM EDT and keeps both parties inside the working day.
Which is behind, Tehran or EDT?
Tehran is 7 hours 30 minutes behind EDT. When it is 12:00 PM in Tehran it is 4:30 AM in EDT.
Do Tehran and EDT use different time zones?
Tehran (Iran) uses IRST at UTC+03:30, while EDT uses EDT at UTC-04:00. The IANA identifiers are Asia/Tehran and America/New_York.
Does daylight saving time affect the Tehran–EDT difference?
Neither zone observes daylight saving time, so the -7h 30m offset between Tehran and EDT 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 EDT?
Not normally. The -7h 30m gap only pushes the date over the previous day.
What is the time difference between Tehran and EDT?
EDT is -7h 30m 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 EDT in?
EDT operates on its local timezone.
What are the business hours in Tehran?
Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.
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 EDT timezone?
Major cities in the EDT timezone include New York City, Washington D.C., Toronto, Miami, Philadelphia, Atlanta, Boston, Montreal.
What is the UTC offset for EDT?
Eastern Daylight Time (EDT) is at UTC-04:00. During daylight saving time, it shifts to EST.
What should I know about the EDT timezone?
EDT is observed from the second Sunday of March to the first Sunday of November. During EDT, the US East Coast is only 4 hours behind London (instead of 5).
When is it midnight in Tehran, what time is it in EDT?
When it is 12:00 AM (midnight) in Tehran (IRST), it is -7h 30m later in EDT (EDT).
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