EST to IRST
+8h 30mEST
ESTSOURCEIRST
IRSTGreen rows indicate typical business hours (9 AM - 5 PM)
EST and IRST on the World Map
The map below highlights the EST (Eastern Standard Time) and IRST (Iran Standard Time) timezone regions across the globe.
EST – Eastern Standard Time
UTC-05:00Eastern Standard Time (EST) is the time zone for the eastern United States and Canada, 5 hours behind UTC.
- •EST is the most widely used time zone in the United States by population.
- •The New York Stock Exchange (NYSE) and NASDAQ operate on Eastern Time, opening at 9:30 AM EST.
- •23 US states are fully or partially in the Eastern Time Zone.
- •EST was established by the Standard Time Act of 1918.
- •Over 47% of the US population lives in the Eastern Time Zone.
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.
Understanding the +8h 30m Gap: EST vs IRST
EST runs on Eastern Standard Time (EST) at UTC-05:00. IRST runs on Iran Standard Time (IRST) at UTC+03:30. That puts EST 8 hours 30 minutes ahead of IRST — a difference of +8h 30m at the current offsets.
In practice, when it is 9:00 AM in EST it is 5:30 PM in IRST. Midnight in EST is 8:30 AM in IRST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
EST to IRST time conversion table
| EST (EST) | IRST (IRST) | Day |
|---|---|---|
| 12:00 AM | 8:30 AM | same day |
| 6:00 AM | 2:30 PM | same day |
| 7:00 AM | 3:30 PM | same day |
| 8:00 AM | 4:30 PM | same day |
| 9:00 AM | 5:30 PM | same day |
| 12:00 PM | 8:30 PM | same day |
| 3:00 PM | 11:30 PM | same day |
| 5:00 PM | 1:30 AM | next day |
| 6:00 PM | 2:30 AM | next day |
| 9:00 PM | 5:30 AM | next day |
Why people convert EST to IRST time
- Scheduling a call from EST to IRST: a 10:00 AM start in EST lands at 6:30 PM in IRST, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +8h 30m gap: EST and IRST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in IRST is 5:30 PM in EST.
- Keeping family and friends in sync: knowing that 8:00 PM in EST is 4:30 AM in IRST makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM EST" is unambiguous; "3 PM" across a +8h 30m gap is not.
- With a +8h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week EST takes the early slot, the next week IRST does.
About EST (Eastern Standard Time)
Eastern Standard Time (EST) is observed during the winter months in the eastern part of North America. It covers 23 US states and parts of Canada including Ontario and Quebec. EST is the most populous time zone in the United States, home to major financial centers like New York City and global organizations headquartered in Washington D.C. During daylight saving time (March–November), clocks shift to Eastern Daylight Time (EDT, UTC-04:00). The time zone also covers parts of the Caribbean and Central America including Panama, Jamaica, and the Cayman Islands.
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 EST and IRST
With a +8h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. IRST opens at 9:00 AM IRST, which is 5:30 PM in EST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
EST and IRST have no shared working hours because of the +8h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.
EST is 8 hours 30 minutes ahead of IRST (EST UTC-05:00 → IRST UTC+03:30). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
EST
☀ Currently in DST
Standard: UTC-05:00 · DST: UTC-04:00
Clocks fall back on Sun, Nov 1, 2026
IRST
Does not observe DST
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 EST and IRST?
EST (EST, UTC-05:00) is 8 hours 30 minutes ahead of IRST (IRST, UTC+03:30). The gap is currently +8h 30m.
How do I convert EST time to IRST time?
Add +8h 30m to EST local time. For example, 9:00 AM in EST is 5:30 PM in IRST.
What time is it in IRST right now?
IRST uses IRST at UTC+03:30. Use the live converter at the top of this page — it updates in real time and already accounts for the +8h 30m offset from EST.
What is the best time to call IRST from EST?
There is no shared working-hours window because of the +8h 30m gap. The closest option is 1:00 PM in EST, which is 9:30 PM in IRST.
Which is ahead, EST or IRST?
EST is 8 hours 30 minutes ahead of IRST. When it is 12:00 PM in EST it is 8:30 PM in IRST.
Does daylight saving time affect the EST–IRST difference?
Neither zone observes daylight saving time, so the +8h 30m offset between EST and IRST is fixed all year.
Which other cities share EST's time zone?
EST also covers New York City, Washington D.C., Miami, Toronto, Philadelphia, Atlanta, Boston, Montreal and 8 more.
Which countries use EST, EST's zone?
EST is used in United States (Eastern), Canada (Ontario, Quebec), Mexico (Quintana Roo), Panama, Jamaica, Cayman Islands, Haiti, Bahamas and 4 more.
Is there a day difference between EST and IRST?
Not normally. The +8h 30m gap only pushes the date over for late-evening times.
What is the time difference between EST and IRST?
IRST is +8h 30m from EST.
What timezone is EST in?
EST operates on its local timezone.
What timezone is IRST in?
IRST operates on its local timezone.
Which countries use EST (Eastern Standard Time)?
EST is used in United States (Eastern), Canada (Ontario, Quebec), Mexico (Quintana Roo), Panama, Jamaica, Cayman Islands, and 6 more countries.
Does EST observe daylight saving time?
Yes, EST switches to EDT during summer months.
What are some interesting facts about EST?
EST is the most widely used time zone in the United States by population. The New York Stock Exchange (NYSE) and NASDAQ operate on Eastern Time, opening at 9:30 AM EST.
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 EST, what time is it in IRST?
When it is 12:00 AM (midnight) in EST (EST), it is +8h 30m later in IRST (IRST).
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See every conversion from EST →·See every conversion from IRST →