Tehran to UTC
-3h 30mTehran
IRSTSOURCEUTC
UTCGreen rows indicate typical business hours (9 AM - 5 PM)
IRST and UTC on the World Map
The map below highlights the IRST (Iran Standard Time) and UTC (Coordinated Universal 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.
UTC – Coordinated Universal Time
UTC+00:00Coordinated Universal Time (UTC) is the world's primary time standard, used as the basis for civil time worldwide.
- •UTC is the basis for all civil time zones worldwide.
- •The abbreviation 'UTC' is a compromise between English (CUT) and French (TUC).
- •UTC is based on atomic clocks and is accurate to within a nanosecond per day.
- •Servers and databases worldwide store timestamps in UTC to avoid timezone confusion.
- •Leap seconds are occasionally added to UTC to keep it aligned with Earth's rotation.
About Tehran
WikipediaTehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.
Iran Standard Time (IRST) is one of few timezones with a 30-minute offset (UTC+3:30).
Time Conversion Guide: Tehran to UTC
Tehran runs on Iran Standard Time (IRST) at UTC+03:30. UTC runs on Coordinated Universal Time (UTC) at UTC+00:00. That puts Tehran 3 hours 30 minutes behind UTC — a difference of -3h 30m at the current offsets.
In practice, when it is 9:00 AM in Tehran it is 5:30 AM in UTC. Midnight in Tehran is 8:30 PM in UTC. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Tehran to UTC time conversion table
| Tehran (IRST) | UTC (UTC) | Day |
|---|---|---|
| 12:00 AM | 8:30 PM | previous day |
| 6:00 AM | 2:30 AM | same day |
| 7:00 AM | 3:30 AM | same day |
| 8:00 AM | 4:30 AM | same day |
| 9:00 AM | 5:30 AM | same day |
| 12:00 PM | 8:30 AM | same day |
| 3:00 PM | 11:30 AM | same day |
| 5:00 PM | 1:30 PM | same day |
| 6:00 PM | 2:30 PM | same day |
| 9:00 PM | 5:30 PM | same day |
Why people convert Tehran to UTC time
- Scheduling a call from Tehran to UTC: a 10:00 AM start in Tehran lands at 6:30 AM in UTC, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Tehran and UTC are inside the 9-to-5 working day between 12:30 PM and 5:00 PM IRST time (9:00 AM–1:30 PM UTC). That is roughly 4 hours 30 minutes of usable overlap.
- Booking travel or deliveries: tracking UTC local time against Tehran keeps pickup windows and arrival estimates honest across the -3h 30m offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a -3h 30m gap is not.
- Block 12:30 PM–5:00 PM IRST as the recurring meeting window if you work primarily from Tehran and need UTC 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 UTC (Coordinated Universal Time)
Coordinated Universal Time (UTC) is the primary time standard by which the world regulates clocks and time. It is effectively the successor to GMT and is based on International Atomic Time with leap seconds added to keep it synchronized with Earth's rotation. UTC is used in aviation, computing, navigation, weather forecasting, and the International Space Station. Most programming languages and databases store timestamps in UTC.
Best time to call between Tehran and UTC
Both Tehran and UTC sit inside the 9 AM – 5 PM working day between 12:30 PM–5:00 PM IRST, which is 9:00 AM–1:30 PM UTC. That gives roughly 4 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Tehran and UTC overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.
Tehran is 3 hours 30 minutes behind UTC (IRST UTC+03:30 → UTC UTC+00:00). The shared working window is 12:30 PM–5:00 PM IRST. Remember to re-check around daylight-saving transitions.
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 Tehran and UTC?
Tehran (IRST, UTC+03:30) is 3 hours 30 minutes behind UTC (UTC, UTC+00:00). The gap is currently -3h 30m.
How do I convert Tehran time to UTC time?
Add -3h 30m to Tehran local time. For example, 9:00 AM in Tehran is 5:30 AM in UTC.
What time is it in UTC right now?
UTC uses UTC at UTC+00:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -3h 30m offset from Tehran.
What is the best time to call UTC from Tehran?
Call between 12:30 PM and 5:00 PM IRST — that maps to 9:00 AM–1:30 PM UTC and keeps both parties inside the working day.
Which is behind, Tehran or UTC?
Tehran is 3 hours 30 minutes behind UTC. When it is 12:00 PM in Tehran it is 8:30 AM in UTC.
Do Tehran and UTC use different time zones?
Tehran (Iran) uses IRST at UTC+03:30, while UTC uses UTC at UTC+00:00. The IANA identifiers are Asia/Tehran and UTC.
Does daylight saving time affect the Tehran–UTC difference?
Neither zone observes daylight saving time, so the -3h 30m offset between Tehran and UTC is fixed all year.
Which other cities share Tehran's time zone?
IRST also covers Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.
Which countries use IRST, Tehran's zone?
IRST is used in Iran.
Is there a day difference between Tehran and UTC?
Not normally. The -3h 30m gap only pushes the date over the previous day.
What is the time difference between Tehran and UTC?
UTC is -3h 30m from Tehran.
What timezone is Tehran in?
Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.
What timezone is UTC in?
UTC operates on its local timezone.
What are the business hours in Tehran?
Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.
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 UTC timezone?
Major cities in the UTC timezone include London, Dublin, Reykjavik, Accra, Lisbon, Dakar.
What is the UTC offset for UTC?
Coordinated Universal Time (UTC) is at UTC+00:00.
What should I know about the UTC timezone?
UTC is the basis for all civil time zones worldwide. The abbreviation 'UTC' is a compromise between English (CUT) and French (TUC).
When is it midnight in Tehran, what time is it in UTC?
When it is 12:00 AM (midnight) in Tehran (IRST), it is -3h 30m later in UTC (UTC).
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