IRST to EEST
-0h 30mIRST
IRSTSOURCEEEST
EESTGreen rows indicate typical business hours (9 AM - 5 PM)
IRST and EEST on the World Map
The map below highlights the IRST (Iran Standard Time) and EEST (Eastern European Summer 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.
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.
Comparing Time Zones: IRST and EEST
IRST runs on Iran Standard Time (IRST) at UTC+03:30. EEST runs on Eastern European Summer Time (EEST) at UTC+03:00. That puts IRST 30 minutes behind EEST — a difference of -0h 30m at the current offsets.
In practice, when it is 9:00 AM in IRST it is 8:30 AM in EEST. Midnight in IRST is 11:30 PM in EEST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
IRST to EEST time conversion table
| IRST (IRST) | EEST (EEST) | Day |
|---|---|---|
| 12:00 AM | 11:30 PM | previous day |
| 6:00 AM | 5:30 AM | same day |
| 7:00 AM | 6:30 AM | same day |
| 8:00 AM | 7:30 AM | same day |
| 9:00 AM | 8:30 AM | same day |
| 12:00 PM | 11:30 AM | same day |
| 3:00 PM | 2:30 PM | same day |
| 5:00 PM | 4:30 PM | same day |
| 6:00 PM | 5:30 PM | same day |
| 9:00 PM | 8:30 PM | same day |
Why people convert IRST to EEST time
- Scheduling a call from IRST to EEST: a 10:00 AM start in IRST lands at 9:30 AM in EEST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both IRST and EEST are inside the 9-to-5 working day between 9:30 AM and 5:00 PM IRST time (9:00 AM–4:30 PM EEST). That is roughly 7 hours 30 minutes of usable overlap.
- Coordinating a IRST-based team with EEST 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 -0h 30m gap is not.
- Block 9:30 AM–5:00 PM IRST as the recurring meeting window if you work primarily from IRST and need EEST 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 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.
Best time to call between IRST and EEST
Both IRST and EEST sit inside the 9 AM – 5 PM working day between 9:30 AM–5:00 PM IRST, which is 9:00 AM–4:30 PM EEST. That gives roughly 7 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
IRST and EEST share 7 hours of working-hours overlap (9:30 AM–5:00 PM IRST), so scheduling a live meeting is straightforward.
IRST is 30 minutes behind EEST (IRST UTC+03:30 → EEST UTC+03:00). The shared working window is 9:30 AM–5:00 PM IRST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
IRST
Does not observe DST
EEST
☀ Currently in DST
Standard: UTC+02:00 · DST: UTC+03:00
Clocks fall back on Sun, Oct 25, 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 IRST and EEST?
IRST (IRST, UTC+03:30) is 30 minutes behind EEST (EEST, UTC+03:00). The gap is currently -0h 30m.
How do I convert IRST time to EEST time?
Add -0h 30m to IRST local time. For example, 9:00 AM in IRST is 8:30 AM in EEST.
What time is it in EEST right now?
EEST uses EEST at UTC+03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -0h 30m offset from IRST.
What is the best time to call EEST from IRST?
Call between 9:30 AM and 5:00 PM IRST — that maps to 9:00 AM–4:30 PM EEST and keeps both parties inside the working day.
Which is behind, IRST or EEST?
IRST is 30 minutes behind EEST. When it is 12:00 PM in IRST it is 11:30 AM in EEST.
Does daylight saving time affect the IRST–EEST difference?
Neither zone observes daylight saving time, so the -0h 30m offset between IRST and EEST is fixed all year.
Which other cities share IRST's time zone?
IRST also covers Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.
Which countries use IRST, IRST's zone?
IRST is used in Iran.
Is there a day difference between IRST and EEST?
Not normally. The -0h 30m gap only pushes the date over the previous day.
What is the time difference between IRST and EEST?
EEST is -0h 30m from IRST.
What timezone is IRST in?
IRST operates on its local timezone.
What timezone is EEST in?
EEST operates on its local timezone.
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 EEST timezone?
Major cities in the EEST timezone include Athens, Helsinki, Bucharest, Sofia, Kyiv, Riga.
What is the UTC offset for EEST?
Eastern European Summer Time (EEST) is at UTC+03:00. During daylight saving time, it shifts to EEST.
What should I know about the EEST timezone?
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).
When is it midnight in IRST, what time is it in EEST?
When it is 12:00 AM (midnight) in IRST (IRST), it is -0h 30m later in EEST (EEST).
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