Iran to Vienna
-1h 30mIran
IRSTSOURCEVienna
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 Vienna
WikipediaVienna operates on Central European Time (CET/CEST). As a major EU hub and headquarters for international organizations, Vienna coordinates Central European business.
Vienna has more than 50 theaters and opera houses.
Iran to Vienna Time Difference – Complete Guide
Iran runs on Iran Standard Time (IRST) at UTC+03:30. Vienna runs on Central European Summer Time (CEST) at UTC+02:00, also currently on daylight saving time. That puts Iran 1 hour 30 minutes behind Vienna — 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 Vienna. Midnight in Iran is 10:30 PM in Vienna.Vienna observes daylight saving time while Iran does not, so the gap narrows or widens by an hour part of the year.
Iran to Vienna time conversion table
| Iran (IRST) | Vienna (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 Vienna time
- Scheduling a call from Iran to Vienna: a 10:00 AM start in Iran lands at 8:30 AM in Vienna, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Iran and Vienna 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 Vienna 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 Vienna colleagues present.
- Vienna: 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 Iran and Vienna
Both Iran and Vienna 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 Vienna 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 Vienna (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
Vienna
☀ 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 Vienna?
Iran (IRST, UTC+03:30) is 1 hour 30 minutes behind Vienna (CEST, UTC+02:00). The gap is currently -1h 30m.
How do I convert Iran time to Vienna time?
Add -1h 30m to Iran local time. For example, 9:00 AM in Iran is 7:30 AM in Vienna.
What time is it in Vienna right now?
Vienna 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 Vienna 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 Vienna?
Iran is 1 hour 30 minutes behind Vienna. When it is 12:00 PM in Iran it is 10:30 AM in Vienna.
Do Iran and Vienna use different time zones?
Iran (Iran) uses IRST at UTC+03:30, while Vienna (Austria) uses CEST at UTC+02:00. The IANA identifiers are Asia/Tehran and Europe/Vienna.
Does daylight saving time affect the Iran–Vienna difference?
Yes at the moment: Vienna 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 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 Vienna?
Not normally. The -1h 30m gap only pushes the date over the previous day.
What is the time difference between Iran and Vienna?
Vienna is -1h 30m from Iran.
What timezone is Iran in?
Iran operates on its local timezone.
What timezone is Vienna in?
Vienna operates on Central European Time (CET/CEST). As a major EU hub and headquarters for international organizations, Vienna coordinates Central European business.
What are the business hours in Vienna?
Standard business hours in Vienna are 8:00 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 Iran, what time is it in Vienna?
When it is 12:00 AM (midnight) in Iran (IRST), it is -1h 30m later in Vienna (CET).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More Iran time conversions
- iran to tehran
- iran to irst
- iran to new york
- iran to london
- iran to dubai
- iran to tokyo
- iran to singapore
- iran to sydney
- iran to los angeles
- iran to paris
- iran to delhi
- iran to mumbai
- iran to berlin
- iran to hong kong
- iran to toronto
- iran to kathmandu
- new york to iran
- london to iran
- dubai to iran
- tokyo to iran
- singapore to iran
- sydney to iran
- los angeles to iran
- paris to iran
- delhi to iran
- mumbai to iran
- berlin to iran
- hong kong to iran
- toronto to iran
- kathmandu to iran
See every conversion from Iran →·See every conversion from Vienna →