Iran to CEST
-1h 30mIran
IRSTSOURCECEST
CESTGreen rows indicate typical business hours (9 AM - 5 PM)
IRST and CEST on the World Map
The map below highlights the IRST (Iran Standard Time) and CEST (Central 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.
CEST – Central European Summer Time
UTC+02:00Central European Summer Time (CEST) is the daylight saving time in Central Europe, 2 hours ahead of UTC.
- •CEST runs from the last Sunday of March to the last Sunday of October.
- •The EU has voted to abolish clock changes but implementation has been delayed.
- •CEST shares the same offset as EET (UTC+02:00).
Comparing Time Zones: Iran and CEST
Iran runs on Iran Standard Time (IRST) at UTC+03:30. CEST runs on Central European Summer Time (CEST) at UTC+02:00. That puts Iran 1 hour 30 minutes behind CEST — a difference of -1h 30m at the current offsets.
In practice, when it is 9:00 AM in Iran it is 7:30 AM in CEST. Midnight in Iran is 10:30 PM in CEST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Iran to CEST time conversion table
| Iran (IRST) | CEST (CEST) | Day |
|---|---|---|
| 12:00 AM | 10:30 PM | previous day |
| 6:00 AM | 4:30 AM | same day |
| 7:00 AM | 5:30 AM | same day |
| 8:00 AM | 6:30 AM | same day |
| 9:00 AM | 7:30 AM | same day |
| 12:00 PM | 10:30 AM | same day |
| 3:00 PM | 1:30 PM | same day |
| 5:00 PM | 3:30 PM | same day |
| 6:00 PM | 4:30 PM | same day |
| 9:00 PM | 7:30 PM | same day |
Why people convert Iran to CEST time
- Scheduling a call from Iran to CEST: a 10:00 AM start in Iran lands at 8:30 AM in CEST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Iran and CEST are inside the 9-to-5 working day between 10:30 AM and 5:00 PM IRST time (9:00 AM–3:30 PM CEST). That is roughly 6 hours 30 minutes of usable overlap.
- Coordinating a Iran-based team with CEST 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 -1h 30m gap is not.
- Block 10:30 AM–5:00 PM IRST as the recurring meeting window if you work primarily from Iran and need CEST 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 CEST (Central European Summer Time)
Central European Summer Time (CEST) is observed from the last Sunday of March to the last Sunday of October across most of Europe. During CEST, clocks are 2 hours ahead of UTC. The EU has debated abolishing seasonal clock changes since 2019.
Best time to call between Iran and CEST
Both Iran and CEST sit inside the 9 AM – 5 PM working day between 10:30 AM–5:00 PM IRST, which is 9:00 AM–3:30 PM CEST. That gives roughly 6 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Iran and CEST share 6 hours of working-hours overlap (10:30 AM–5:00 PM IRST), so scheduling a live meeting is straightforward.
Iran is 1 hour 30 minutes behind CEST (IRST UTC+03:30 → CEST UTC+02:00). The shared working window is 10:30 AM–5:00 PM IRST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Iran
Does not observe DST
CEST
☀ Currently in DST
Standard: UTC+01:00 · DST: UTC+02:00
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 Iran and CEST?
Iran (IRST, UTC+03:30) is 1 hour 30 minutes behind CEST (CEST, UTC+02:00). The gap is currently -1h 30m.
How do I convert Iran time to CEST time?
Add -1h 30m to Iran local time. For example, 9:00 AM in Iran is 7:30 AM in CEST.
What time is it in CEST right now?
CEST uses CEST at UTC+02:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -1h 30m offset from Iran.
What is the best time to call CEST from Iran?
Call between 10:30 AM and 5:00 PM IRST — that maps to 9:00 AM–3:30 PM CEST and keeps both parties inside the working day.
Which is behind, Iran or CEST?
Iran is 1 hour 30 minutes behind CEST. When it is 12:00 PM in Iran it is 10:30 AM in CEST.
Do Iran and CEST use different time zones?
Iran (Iran) uses IRST at UTC+03:30, while CEST uses CEST at UTC+02:00. The IANA identifiers are Asia/Tehran and Europe/Paris.
Does daylight saving time affect the Iran–CEST difference?
Neither zone observes daylight saving time, so the -1h 30m offset between Iran and CEST is fixed all year.
Which other cities share Iran's time zone?
IRST also covers Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.
Which countries use IRST, Iran's zone?
IRST is used in Iran.
Is there a day difference between Iran and CEST?
Not normally. The -1h 30m gap only pushes the date over the previous day.
What is the time difference between Iran and CEST?
CEST is -1h 30m from Iran.
What timezone is Iran in?
Iran operates on its local timezone.
What timezone is CEST in?
CEST 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 CEST timezone?
Major cities in the CEST timezone include Paris, Berlin, Rome, Madrid, Amsterdam, Vienna, Stockholm.
What is the UTC offset for CEST?
Central European Summer Time (CEST) is at UTC+02:00. During daylight saving time, it shifts to CET.
What should I know about the CEST timezone?
CEST runs from the last Sunday of March to the last Sunday of October. The EU has voted to abolish clock changes but implementation has been delayed.
When is it midnight in Iran, what time is it in CEST?
When it is 12:00 AM (midnight) in Iran (IRST), it is -1h 30m later in CEST (CEST).
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See every conversion from Iran →·See every conversion from CEST →