What is the time difference between EST and IRST?

Iran Standard Time (IRST) is 7 hours and 30 minutes ahead of Eastern Standard Time (EST). EST uses a UTC offset of UTC-4, while IRST uses UTC+3:30. For example, when it's 9:00 AM in EST, it's 4:30 PM in IRST. Note that this difference may shift by one hour during daylight saving time transitions if EST observes DST. Use the conversion table above to see the exact time for each hour of the day.

How do I convert EST to IRST?

To convert EST to IRST, add 7 hours and 30 minutes to the EST time. For example, 9:00 AM EST is 4:30 PM IRST, and 5:00 PM EST is 12:30 AM IRST. Keep in mind that during daylight saving time transitions, the offset between these timezones may temporarily change by one hour. You can also use the interactive converter above for quick, accurate results.

What time is it in IRST when it's noon in EST?

When it's 12:00 PM (noon) in EST, it's 7:30 PM in IRST. This is because IRST is 7 hours and 30 minutes ahead of EST. Similarly, when it's 6:00 PM in EST, it's 1:30 AM in IRST. During daylight saving time transitions, these times may shift by one hour, so always verify the current offset. The color-coded conversion table above shows every hour mapped between both timezones.

How many hours ahead is IRST from EST?

IRST is 7 hours and 30 minutes ahead of EST. This means when it's 9:00 AM in EST, it's 4:30 PM in IRST, and when it's midnight in EST, it's 7:30 AM in IRST. The exact difference can vary by one hour during daylight saving time transitions. The conversion table above provides a complete hour-by-hour mapping.

Is IRST ahead or behind EST?

IRST is ahead of EST by 7 hours and 30 minutes. Clocks in IRST show a later time than EST, meaning the day starts earlier in IRST relative to EST. For example, when it's morning in EST, it's already afternoon or evening in IRST. This gap may change by one hour during DST transitions.

Does EST observe daylight saving time?

Yes, Eastern Standard Time observes daylight saving time. During DST, the abbreviation changes to EDT and clocks move forward by one hour, typically in spring. Clocks then fall back in autumn, returning to standard EST time. This means the UTC offset for EST shifts between two values depending on the season. Check our DST change calendar for exact transition dates that may affect your EST to IRST conversions.

Does IRST observe daylight saving time?

No, Iran Standard Time does not observe daylight saving time. The UTC offset of UTC+3:30 remains the same year-round, which simplifies time conversions. Regions using IRST keep their clocks unchanged regardless of the season.

What is the best time to call from EST to IRST?

The best time for a call between EST and IRST is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in IRST during their work day, call between 1:30 AM and 9:30 AM your EST time. Avoid calling too early or late, as the 7 hours and 30 minutes difference means your evening could be their late night. Check the color-coded conversion table above — green hours indicate business hours in both zones, making it easy to find the ideal time.

When does daylight saving time change in EST?

Daylight saving time transitions vary by year and region. Eastern Standard Time observes DST, which typically shifts clocks forward by one hour in spring ("spring forward") and back in fall ("fall back"). During these transition periods, the time difference between EST and IRST may temporarily change by one hour, which can cause confusion for scheduled meetings or calls. It's important to double-check your conversions around transition dates, especially if the two timezones switch on different dates. Check our DST change calendar for exact transition dates in the current year.

Do EST and IRST ever have the same time?

No, EST and IRST never show the same time because their base UTC offsets are different. However, because EST observes daylight saving time and IRST does not, the time difference between them changes by one hour during DST transitions. This means the gap narrows or widens depending on the season, but the two clocks never align. Always verify the current offset around DST transition dates to avoid scheduling errors.

EST to IRST Converter

Convert Eastern Standard Time to Iran Standard Time. See the hour-by-hour conversion table below.

Timezone Details

Eastern Standard Time

10:37 PM

Thursday, April 2, 2026

EDT (UTC-04:00)

Tehran

6:07 AM

Friday, April 3, 2026

Tehran (UTC+03:30)

Difference: +7h 30m

EDT DST: Yes (EDT)

24-Hour Overview

EDT — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

Tehran — 24-hour overview

7a7a

10a10a

11a

12p

1p1p

4p4p

7p7p

10p10p

11p

12a

1a1a

4a4a

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

IRST to EST EST to PST PST to EST EST to GMT GMT to EST EST to IST IST to EST EST to CET CET to EST

Cities in These Timezones

EST Cities

New York Philadelphia Washington D.C.Boston Atlanta

IRST Cities

Tehran

More Tools

Compare EST & IRST Plan a Meeting (EST & IRST)See on Map

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

Eastern Standard Time on Wikipedia IANA Time Zone Database