Tehran to IRST
+0hTehran
IRSTSOURCEIRST
IRSTGreen rows indicate typical business hours (9 AM - 5 PM)
IRST and IRST on the World Map
The map below highlights the IRST (Iran Standard Time) and IRST (Iran Standard 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.
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 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).
Understanding the +0h Gap: Tehran vs IRST
Tehran runs on Iran Standard Time (IRST) at UTC+03:30. IRST runs on Iran Standard Time (IRST) at UTC+03:30. That puts Tehran no time difference IRST — a difference of +0h at the current offsets.
In practice, when it is 9:00 AM in Tehran it is 9:00 AM in IRST. Midnight in Tehran is 12:00 AM in IRST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Tehran to IRST time conversion table
| Tehran (IRST) | IRST (IRST) | Day |
|---|---|---|
| 12:00 AM | 12:00 AM | same day |
| 6:00 AM | 6:00 AM | same day |
| 7:00 AM | 7:00 AM | same day |
| 8:00 AM | 8:00 AM | same day |
| 9:00 AM | 9:00 AM | same day |
| 12:00 PM | 12:00 PM | same day |
| 3:00 PM | 3:00 PM | same day |
| 5:00 PM | 5:00 PM | same day |
| 6:00 PM | 6:00 PM | same day |
| 9:00 PM | 9:00 PM | same day |
Why people convert Tehran to IRST time
- Scheduling a call from Tehran to IRST: a 10:00 AM start in Tehran lands at 10:00 AM in IRST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Tehran and IRST are inside the 9-to-5 working day between 9:00 AM and 5:00 PM IRST time (9:00 AM–5:00 PM IRST). That is roughly 8 hours of usable overlap.
- Booking travel or deliveries: tracking IRST local time against Tehran keeps pickup windows and arrival estimates honest across the +0h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a +0h gap is not.
- Block 9:00 AM–5:00 PM IRST as the recurring meeting window if you work primarily from Tehran and need IRST 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 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 Tehran and IRST
Both Tehran and IRST sit inside the 9 AM – 5 PM working day between 9:00 AM–5:00 PM IRST, which is 9:00 AM–5:00 PM IRST. That gives roughly 8 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Tehran and IRST share 8 hours of working-hours overlap (9:00 AM–5:00 PM IRST), so scheduling a live meeting is straightforward.
Tehran is no time difference IRST (IRST UTC+03:30 → IRST UTC+03:30). The shared working window is 9:00 AM–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 IRST?
Tehran (IRST, UTC+03:30) is no time difference IRST (IRST, UTC+03:30). The gap is currently +0h.
How do I convert Tehran time to IRST time?
Add +0h to Tehran local time. For example, 9:00 AM in Tehran is 9:00 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 +0h offset from Tehran.
What is the best time to call IRST from Tehran?
Call between 9:00 AM and 5:00 PM IRST — that maps to 9:00 AM–5:00 PM IRST and keeps both parties inside the working day.
Which is ahead, Tehran or IRST?
Tehran and IRST are currently on the same clock.
Do Tehran and IRST use different time zones?
Tehran (Iran) uses IRST at UTC+03:30, while IRST uses IRST at UTC+03:30. They actually share the same IANA zone.
Does daylight saving time affect the Tehran–IRST difference?
Neither zone observes daylight saving time, so the +0h offset between Tehran and IRST 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.
What is the time difference between Tehran and IRST?
IRST is +0h 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 IRST in?
IRST 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 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 Tehran, what time is it in IRST?
When it is 12:00 AM (midnight) in Tehran (IRST), it is +0h later in IRST (IRST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More Tehran time conversions
- tehran to iran
- tehran to dubai
- tehran to mumbai
- tehran to delhi
- tehran to bangalore
- tehran to kathmandu
- tehran to bangkok
- tehran to singapore
- tehran to hong kong
- tehran to shanghai
- tehran to beijing
- tehran to tokyo
- tehran to osaka
- tehran to new york
- tehran to london
- tehran to sydney
- tehran to los angeles
- tehran to paris
- tehran to berlin
- tehran to toronto
- new york to tehran
- london to tehran
- dubai to tehran
- tokyo to tehran
- singapore to tehran
- sydney to tehran
- los angeles to tehran
- paris to tehran
- delhi to tehran
- mumbai to tehran
- berlin to tehran
- hong kong to tehran
- toronto to tehran
- kathmandu to tehran
See every conversion from Tehran →·See every conversion from IRST →