Oslo to Iran
+1h 30mOslo
CESTSOURCEIran
IRSTGreen rows indicate typical business hours (9 AM - 5 PM)
CEST and IRST on the World Map
The map below highlights the CEST (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.
About Oslo
WikipediaOslo operates on Central European Time (CET/CEST). As home to the world's largest sovereign wealth fund and major oil firms, Oslo influences global energy markets.
Oslo aims to be car-free by 2030.
Comparing Time Zones: Oslo and Iran
Oslo runs on Central European Summer Time (CEST) at UTC+02:00, currently observing daylight saving time. Iran runs on Iran Standard Time (IRST) at UTC+03:30. That puts Oslo 1 hour 30 minutes ahead of Iran — a difference of +1h 30m at the current offsets.
In practice, when it is 9:00 AM in Oslo it is 10:30 AM in Iran. Midnight in Oslo is 1:30 AM in Iran.Oslo observes daylight saving time while Iran does not, so the gap narrows or widens by an hour part of the year.
Oslo to Iran time conversion table
| Oslo (CEST) | Iran (IRST) | Day |
|---|---|---|
| 12:00 AM | 1:30 AM | same day |
| 6:00 AM | 7:30 AM | same day |
| 7:00 AM | 8:30 AM | same day |
| 8:00 AM | 9:30 AM | same day |
| 9:00 AM | 10:30 AM | same day |
| 12:00 PM | 1:30 PM | same day |
| 3:00 PM | 4:30 PM | same day |
| 5:00 PM | 6:30 PM | same day |
| 6:00 PM | 7:30 PM | same day |
| 9:00 PM | 10:30 PM | same day |
Why people convert Oslo to Iran time
- Scheduling a call from Oslo to Iran: a 10:00 AM start in Oslo lands at 11:30 AM in Iran, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Oslo and Iran are inside the 9-to-5 working day between 9:00 AM and 3:30 PM CEST time (10:30 AM–5:00 PM IRST). That is roughly 6 hours 30 minutes of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in Oslo is 9:30 PM in Iran makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM CEST" is unambiguous; "3 PM" across a +1h 30m gap is not.
- Block 9:00 AM–3:30 PM CEST as the recurring meeting window if you work primarily from Oslo and need Iran colleagues present.
- Oslo: Clocks fall back on Sun, Oct 25, 2026. Re-check this page after that date because the offset changes and so does the +1h 30m gap.
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 Oslo and Iran
Both Oslo and Iran sit inside the 9 AM – 5 PM working day between 9:00 AM–3:30 PM CEST, which is 10:30 AM–5:00 PM IRST. That gives roughly 6 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Oslo and Iran share 6 hours of working-hours overlap (9:00 AM–3:30 PM CEST), so scheduling a live meeting is straightforward.
Oslo is 1 hour 30 minutes ahead of Iran (CEST UTC+02:00 → IRST UTC+03:30). The shared working window is 9:00 AM–3:30 PM CEST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Oslo
☀ Currently in DST
Standard: UTC+01:00 · DST: UTC+02:00
Clocks fall back on Sun, Oct 25, 2026
Iran
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 Oslo and Iran?
Oslo (CEST, UTC+02:00) is 1 hour 30 minutes ahead of Iran (IRST, UTC+03:30). The gap is currently +1h 30m.
How do I convert Oslo time to Iran time?
Add +1h 30m to Oslo local time. For example, 9:00 AM in Oslo is 10:30 AM in Iran.
What time is it in Iran right now?
Iran 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 +1h 30m offset from Oslo.
What is the best time to call Iran from Oslo?
Call between 9:00 AM and 3:30 PM CEST — that maps to 10:30 AM–5:00 PM IRST and keeps both parties inside the working day.
Which is ahead, Oslo or Iran?
Oslo is 1 hour 30 minutes ahead of Iran. When it is 12:00 PM in Oslo it is 1:30 PM in Iran.
Do Oslo and Iran use different time zones?
Oslo (Norway) uses CEST at UTC+02:00, while Iran (Iran) uses IRST at UTC+03:30. The IANA identifiers are Europe/Oslo and Asia/Tehran.
Does daylight saving time affect the Oslo–Iran difference?
Yes at the moment: Oslo is on daylight saving time and Iran is not, so the +1h 30m gap shifts by an hour when exactly one of them changes clocks.
Which other cities share Oslo's time zone?
CEST also covers Paris, Berlin, Rome, Madrid, Amsterdam, Brussels, Vienna, Warsaw and 10 more.
Which countries use CEST, Oslo's zone?
CEST is used in Germany, France, Italy, Spain, Netherlands, Belgium, Austria, Switzerland and 19 more.
Is there a day difference between Oslo and Iran?
Not normally. The +1h 30m gap only pushes the date over for late-evening times.
What is the time difference between Oslo and Iran?
Iran is +1h 30m from Oslo.
What timezone is Oslo in?
Oslo operates on Central European Time (CET/CEST). As home to the world's largest sovereign wealth fund and major oil firms, Oslo influences global energy markets.
What timezone is Iran in?
Iran operates on its local timezone.
What are the business hours in Oslo?
Standard business hours in Oslo are 8:00 AM - 4:00 PM CET.
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 Oslo, what time is it in Iran?
When it is 12:00 AM (midnight) in Oslo (CET), it is +1h 30m later in Iran (IRST).
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