CET to IRST
+2h 30mCET
CETSOURCEIRST
IRSTGreen rows indicate typical business hours (9 AM - 5 PM)
CET and IRST on the World Map
The map below highlights the CET (Central European Time) and IRST (Iran Standard Time) timezone regions across the globe.
CET – Central European Time
UTC+01:00Central European Time (CET) is used across most of Western and Central Europe, 1 hour ahead of UTC.
- •CET covers more European countries than any other time zone.
- •Spain uses CET despite being geographically aligned with GMT/WET.
- •The Frankfurt Stock Exchange, Euronext (Amsterdam/Paris), and Borsa Italiana operate on CET.
- •Over 500 million people live in the CET time zone.
- •France moved to CET during the German occupation in WWII and never switched back.
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.
Time Conversion Guide: CET to IRST
CET runs on Central European Time (CET) at UTC+01:00. IRST runs on Iran Standard Time (IRST) at UTC+03:30. That puts CET 2 hours 30 minutes ahead of IRST — a difference of +2h 30m at the current offsets.
In practice, when it is 9:00 AM in CET it is 11:30 AM in IRST. Midnight in CET is 2:30 AM in IRST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
CET to IRST time conversion table
| CET (CET) | IRST (IRST) | Day |
|---|---|---|
| 12:00 AM | 2:30 AM | same day |
| 6:00 AM | 8:30 AM | same day |
| 7:00 AM | 9:30 AM | same day |
| 8:00 AM | 10:30 AM | same day |
| 9:00 AM | 11:30 AM | same day |
| 12:00 PM | 2:30 PM | same day |
| 3:00 PM | 5:30 PM | same day |
| 5:00 PM | 7:30 PM | same day |
| 6:00 PM | 8:30 PM | same day |
| 9:00 PM | 11:30 PM | same day |
Why people convert CET to IRST time
- Scheduling a call from CET to IRST: a 10:00 AM start in CET lands at 12:30 PM in IRST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both CET and IRST are inside the 9-to-5 working day between 9:00 AM and 2:30 PM CET time (11:30 AM–5:00 PM IRST). That is roughly 5 hours 30 minutes of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in CET is 10:30 PM in IRST makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM CET" is unambiguous; "3 PM" across a +2h 30m gap is not.
- Block 9:00 AM–2:30 PM CET as the recurring meeting window if you work primarily from CET and need IRST colleagues present.
About CET (Central European Time)
Central European Time (CET) is the standard time zone for most of Europe, covering over 30 countries from Spain to Poland, and from Norway to Italy. CET is 1 hour ahead of GMT and is used by the European Union's most populous nations. During summer, most CET countries switch to Central European Summer Time (CEST, UTC+02:00). Major European financial markets in Frankfurt, Paris, and Amsterdam operate on CET.
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 CET and IRST
Both CET and IRST sit inside the 9 AM – 5 PM working day between 9:00 AM–2:30 PM CET, which is 11:30 AM–5:00 PM IRST. That gives roughly 5 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
CET and IRST share 5 hours of working-hours overlap (9:00 AM–2:30 PM CET), so scheduling a live meeting is straightforward.
CET is 2 hours 30 minutes ahead of IRST (CET UTC+01:00 → IRST UTC+03:30). The shared working window is 9:00 AM–2:30 PM CET. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
CET
☀ Currently in DST
Standard: UTC+01:00 · DST: UTC+02:00
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 CET and IRST?
CET (CET, UTC+01:00) is 2 hours 30 minutes ahead of IRST (IRST, UTC+03:30). The gap is currently +2h 30m.
How do I convert CET time to IRST time?
Add +2h 30m to CET local time. For example, 9:00 AM in CET is 11:30 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 +2h 30m offset from CET.
What is the best time to call IRST from CET?
Call between 9:00 AM and 2:30 PM CET — that maps to 11:30 AM–5:00 PM IRST and keeps both parties inside the working day.
Which is ahead, CET or IRST?
CET is 2 hours 30 minutes ahead of IRST. When it is 12:00 PM in CET it is 2:30 PM in IRST.
Does daylight saving time affect the CET–IRST difference?
Neither zone observes daylight saving time, so the +2h 30m offset between CET and IRST is fixed all year.
Which other cities share CET's time zone?
CET also covers Paris, Berlin, Rome, Madrid, Amsterdam, Brussels, Vienna, Warsaw and 10 more.
Which countries use CET, CET's zone?
CET is used in Germany, France, Italy, Spain, Netherlands, Belgium, Austria, Switzerland and 19 more.
Is there a day difference between CET and IRST?
Not normally. The +2h 30m gap only pushes the date over for late-evening times.
What is the time difference between CET and IRST?
IRST is +2h 30m from CET.
What timezone is CET in?
CET operates on its local timezone.
What timezone is IRST in?
IRST operates on its local timezone.
Which countries use CET (Central European Time)?
CET is used in Germany, France, Italy, Spain, Netherlands, Belgium, and 21 more countries.
Does CET observe daylight saving time?
Yes, CET switches to CEST during summer months.
What are some interesting facts about CET?
CET covers more European countries than any other time zone. Spain uses CET despite being geographically aligned with GMT/WET.
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 CET, what time is it in IRST?
When it is 12:00 AM (midnight) in CET (CET), it is +2h 30m later in IRST (IRST).
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See every conversion from CET →·See every conversion from IRST →