EEST to IRST
+0h 30mEEST
EESTSOURCEIRST
IRSTGreen rows indicate typical business hours (9 AM - 5 PM)
EEST and IRST on the World Map
The map below highlights the EEST (Eastern European Summer Time) and IRST (Iran Standard Time) timezone regions across the globe.
EEST – Eastern European Summer Time
UTC+03:00Eastern European Summer Time (EEST, UTC+03:00) is the daylight saving period across eastern Europe, from late March to late October.
- •EEST runs from the last Sunday in March to the last Sunday in October.
- •EEST is one hour ahead of Eastern European Time (EET, UTC+02:00).
- •During EEST, eastern Europe is level with Moscow, Istanbul and Riyadh.
- •EEST follows the EU-wide summer time schedule.
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.
Comparing Time Zones: EEST and IRST
EEST runs on Eastern European Summer Time (EEST) at UTC+03:00. IRST runs on Iran Standard Time (IRST) at UTC+03:30. That puts EEST 30 minutes ahead of IRST — a difference of +0h 30m at the current offsets.
In practice, when it is 9:00 AM in EEST it is 9:30 AM in IRST. Midnight in EEST is 12:30 AM in IRST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
EEST to IRST time conversion table
| EEST (EEST) | IRST (IRST) | Day |
|---|---|---|
| 12:00 AM | 12:30 AM | same day |
| 6:00 AM | 6:30 AM | same day |
| 7:00 AM | 7:30 AM | same day |
| 8:00 AM | 8:30 AM | same day |
| 9:00 AM | 9:30 AM | same day |
| 12:00 PM | 12:30 PM | same day |
| 3:00 PM | 3:30 PM | same day |
| 5:00 PM | 5:30 PM | same day |
| 6:00 PM | 6:30 PM | same day |
| 9:00 PM | 9:30 PM | same day |
Why people convert EEST to IRST time
- Scheduling a call from EEST to IRST: a 10:00 AM start in EEST lands at 10:30 AM in IRST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both EEST and IRST are inside the 9-to-5 working day between 9:00 AM and 4:30 PM EEST time (9:30 AM–5:00 PM IRST). That is roughly 7 hours 30 minutes of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in EEST is 8:30 PM in IRST makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM EEST" is unambiguous; "3 PM" across a +0h 30m gap is not.
- Block 9:00 AM–4:30 PM EEST as the recurring meeting window if you work primarily from EEST and need IRST colleagues present.
About EEST (Eastern European Summer Time)
Eastern European Summer Time (EEST) is the daylight saving period used across eastern Europe, when clocks move one hour forward from Eastern European Time (EET, UTC+02:00) to UTC+03:00. It runs from the last Sunday in March to the last Sunday in October, in step with the rest of the European Union. EEST covers Greece, Finland, Romania, Bulgaria, the Baltic states, Ukraine and Moldova, and matches the offset used year-round by Moscow, Istanbul and Riyadh during those months. Athens and Helsinki both sit near the western edge of the EEST band, so summer evenings stay light well past 21:00.
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 EEST and IRST
Both EEST and IRST sit inside the 9 AM – 5 PM working day between 9:00 AM–4:30 PM EEST, which is 9:30 AM–5:00 PM IRST. That gives roughly 7 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
EEST and IRST share 7 hours of working-hours overlap (9:00 AM–4:30 PM EEST), so scheduling a live meeting is straightforward.
EEST is 30 minutes ahead of IRST (EEST UTC+03:00 → IRST UTC+03:30). The shared working window is 9:00 AM–4:30 PM EEST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
EEST
☀ Currently in DST
Standard: UTC+02:00 · DST: UTC+03:00
Clocks fall back on Sun, Oct 25, 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 EEST and IRST?
EEST (EEST, UTC+03:00) is 30 minutes ahead of IRST (IRST, UTC+03:30). The gap is currently +0h 30m.
How do I convert EEST time to IRST time?
Add +0h 30m to EEST local time. For example, 9:00 AM in EEST is 9:30 AM 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 +0h 30m offset from EEST.
What is the best time to call IRST from EEST?
Call between 9:00 AM and 4:30 PM EEST — that maps to 9:30 AM–5:00 PM IRST and keeps both parties inside the working day.
Which is ahead, EEST or IRST?
EEST is 30 minutes ahead of IRST. When it is 12:00 PM in EEST it is 12:30 PM in IRST.
Does daylight saving time affect the EEST–IRST difference?
Neither zone observes daylight saving time, so the +0h 30m offset between EEST and IRST is fixed all year.
Which other cities share EEST's time zone?
EEST also covers Athens, Helsinki, Bucharest, Sofia, Kyiv, Riga.
Which countries use EEST, EEST's zone?
EEST is used in Greece, Finland, Romania, Bulgaria, Estonia, Latvia, Lithuania, Ukraine and 2 more.
Is there a day difference between EEST and IRST?
Not normally. The +0h 30m gap only pushes the date over for late-evening times.
What is the time difference between EEST and IRST?
IRST is +0h 30m from EEST.
What timezone is EEST in?
EEST operates on its local timezone.
What timezone is IRST in?
IRST operates on its local timezone.
Which countries use EEST (Eastern European Summer Time)?
EEST is used in Greece, Finland, Romania, Bulgaria, Estonia, Latvia, and 4 more countries.
Does EEST observe daylight saving time?
Yes, EEST switches to EEST during summer months.
What are some interesting facts about EEST?
EEST runs from the last Sunday in March to the last Sunday in October. EEST is one hour ahead of Eastern European Time (EET, UTC+02:00).
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 EEST, what time is it in IRST?
When it is 12:00 AM (midnight) in EEST (EEST), it is +0h 30m later in IRST (IRST).
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See every conversion from EEST →·See every conversion from IRST →