IRST to Berlin
-1h 30mIRST
IRSTSOURCEBerlin
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 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.
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.
About Berlin
WikipediaBerlin operates on Central European Time (CET/CEST), same as Paris. As Germany's capital and a major tech hub, Berlin coordinates with EU business hours.
Berlin has more bridges than Venice - approximately 1,700 compared to Venice's 400.
IRST vs Berlin: Offsets, DST and Best Call Times
IRST runs on Iran Standard Time (IRST) at UTC+03:30. Berlin runs on Central European Summer Time (CEST) at UTC+02:00, also currently on daylight saving time. That puts IRST 1 hour 30 minutes behind Berlin — a difference of -1h 30m at the current offsets.
In practice, when it is 9:00 AM in IRST it is 7:30 AM in Berlin. Midnight in IRST is 10:30 PM in Berlin.Berlin observes daylight saving time while IRST does not, so the gap narrows or widens by an hour part of the year.
IRST to Berlin time conversion table
| IRST (IRST) | Berlin (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 IRST to Berlin time
- Scheduling a call from IRST to Berlin: a 10:00 AM start in IRST lands at 8:30 AM in Berlin, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both IRST and Berlin 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.
- Booking travel or deliveries: tracking Berlin local time against IRST keeps pickup windows and arrival estimates honest across the -1h 30m offset.
- 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 IRST and need Berlin colleagues present.
- Berlin: Clocks fall back on Sun, Oct 25, 2026. Any meeting series spanning that date will shift by an hour in local time.
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 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.
Best time to call between IRST and Berlin
Both IRST and Berlin 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
IRST and Berlin share 6 hours of working-hours overlap (10:30 AM–5:00 PM IRST), so scheduling a live meeting is straightforward.
IRST is 1 hour 30 minutes behind Berlin (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
IRST
Does not observe DST
Berlin
☀ 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 IRST and Berlin?
IRST (IRST, UTC+03:30) is 1 hour 30 minutes behind Berlin (CEST, UTC+02:00). The gap is currently -1h 30m.
How do I convert IRST time to Berlin time?
Add -1h 30m to IRST local time. For example, 9:00 AM in IRST is 7:30 AM in Berlin.
What time is it in Berlin right now?
Berlin 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 IRST.
What is the best time to call Berlin from IRST?
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, IRST or Berlin?
IRST is 1 hour 30 minutes behind Berlin. When it is 12:00 PM in IRST it is 10:30 AM in Berlin.
Do IRST and Berlin use different time zones?
IRST uses IRST at UTC+03:30, while Berlin (Germany) uses CEST at UTC+02:00. The IANA identifiers are Asia/Tehran and Europe/Berlin.
Does daylight saving time affect the IRST–Berlin difference?
Yes at the moment: Berlin is on daylight saving time and IRST is not, so the -1h 30m gap shifts by an hour when exactly one of them changes clocks.
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 Berlin?
Not normally. The -1h 30m gap only pushes the date over the previous day.
What is the time difference between IRST and Berlin?
Berlin is -1h 30m from IRST.
What timezone is IRST in?
IRST operates on its local timezone.
What timezone is Berlin in?
Berlin operates on Central European Time (CET/CEST), same as Paris. As Germany's capital and a major tech hub, Berlin coordinates with EU business hours.
What are the business hours in Berlin?
Standard business hours in Berlin are 9:00 AM - 5:00 PM CET.
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 CET timezone?
Major cities in the CET timezone include Paris, Berlin, Rome, Madrid, Amsterdam, Brussels, Vienna, Warsaw.
What is the UTC offset for CET?
Central European Time (CET) is at UTC+01:00. During daylight saving time, it shifts to CEST.
What should I know about the CET timezone?
CET covers more European countries than any other time zone. Spain uses CET despite being geographically aligned with GMT/WET.
When is it midnight in IRST, what time is it in Berlin?
When it is 12:00 AM (midnight) in IRST (IRST), it is -1h 30m later in Berlin (CET).
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