Tehran to Kathmandu
+2h 15mTehran
IRSTSOURCEKathmandu
NPTGreen rows indicate typical business hours (9 AM - 5 PM)
IRST and NPT on the World Map
The map below highlights the IRST (Iran Standard Time) and NPT (Nepal 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.
NPT – Nepal Time
UTC+05:45Nepal Time (NPT, UTC+05:45) is the time zone for Nepal — one of the few offsets in the world set on a 45-minute increment.
- •Nepal Time is UTC+05:45 — a 45-minute offset, not a whole or half hour.
- •The 45-minute offset was adopted in 1986 to match Kathmandu's solar time.
- •Nepal does not observe daylight saving time.
- •Nepal is 15 minutes ahead of India, despite sharing a long open border.
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).
About Kathmandu
WikipediaKathmandu operates on Nepal Time (NPT), one of the world's unique UTC+5:45 timezones. This 15-minute offset from India makes Nepal time distinctive for global coordination.
Nepal Time (NPT) is one of only three timezones offset by 45 minutes (UTC+5:45).
Tehran to Kathmandu Time Difference – Complete Guide
Tehran runs on Iran Standard Time (IRST) at UTC+03:30. Kathmandu runs on Nepal Time (NPT) at UTC+05:45. That puts Tehran 2 hours 15 minutes ahead of Kathmandu — a difference of +2h 15m at the current offsets.
In practice, when it is 9:00 AM in Tehran it is 11:15 AM in Kathmandu. Midnight in Tehran is 2:15 AM in Kathmandu. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Tehran to Kathmandu time conversion table
| Tehran (IRST) | Kathmandu (NPT) | Day |
|---|---|---|
| 12:00 AM | 2:15 AM | same day |
| 6:00 AM | 8:15 AM | same day |
| 7:00 AM | 9:15 AM | same day |
| 8:00 AM | 10:15 AM | same day |
| 9:00 AM | 11:15 AM | same day |
| 12:00 PM | 2:15 PM | same day |
| 3:00 PM | 5:15 PM | same day |
| 5:00 PM | 7:15 PM | same day |
| 6:00 PM | 8:15 PM | same day |
| 9:00 PM | 11:15 PM | same day |
Why people convert Tehran to Kathmandu time
- Scheduling a call from Tehran to Kathmandu: a 10:00 AM start in Tehran lands at 12:15 PM in Kathmandu, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Tehran and Kathmandu are inside the 9-to-5 working day between 9:00 AM and 2:45 PM IRST time (11:15 AM–5:00 PM NPT). That is roughly 5 hours 45 minutes of usable overlap.
- Booking travel or deliveries: tracking Kathmandu local time against Tehran keeps pickup windows and arrival estimates honest across the +2h 15m offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a +2h 15m gap is not.
- Block 9:00 AM–2:45 PM IRST as the recurring meeting window if you work primarily from Tehran and need Kathmandu 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 NPT (Nepal Time)
Nepal Time (NPT) runs at UTC+05:45, one of only a handful of time zones worldwide that are not a whole or half hour from UTC. Nepal set its offset to 5 hours 45 minutes ahead of UTC in 1986 to mark the country's position between the 75°E and 90°E meridians; Kathmandu's solar time sits just over 5 hours 41 minutes ahead of Greenwich, so the 45-minute offset tracks the sun more closely than either 5:30 or 6:00 would. Nepal does not observe daylight saving time, so NPT is fixed all year. The offset makes Nepal 15 minutes ahead of India Standard Time (UTC+05:30) and 2 hours 15 minutes ahead of Dubai (UTC+04:00).
Best time to call between Tehran and Kathmandu
Both Tehran and Kathmandu sit inside the 9 AM – 5 PM working day between 9:00 AM–2:45 PM IRST, which is 11:15 AM–5:00 PM NPT. That gives roughly 5 hours and 45 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Tehran and Kathmandu share 5 hours of working-hours overlap (9:00 AM–2:45 PM IRST), so scheduling a live meeting is straightforward.
Tehran is 2 hours 15 minutes ahead of Kathmandu (IRST UTC+03:30 → NPT UTC+05:45). The shared working window is 9:00 AM–2:45 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 Kathmandu?
Tehran (IRST, UTC+03:30) is 2 hours 15 minutes ahead of Kathmandu (NPT, UTC+05:45). The gap is currently +2h 15m.
How do I convert Tehran time to Kathmandu time?
Add +2h 15m to Tehran local time. For example, 9:00 AM in Tehran is 11:15 AM in Kathmandu.
What time is it in Kathmandu right now?
Kathmandu uses NPT at UTC+05:45. Use the live converter at the top of this page — it updates in real time and already accounts for the +2h 15m offset from Tehran.
What is the best time to call Kathmandu from Tehran?
Call between 9:00 AM and 2:45 PM IRST — that maps to 11:15 AM–5:00 PM NPT and keeps both parties inside the working day.
Which is ahead, Tehran or Kathmandu?
Tehran is 2 hours 15 minutes ahead of Kathmandu. When it is 12:00 PM in Tehran it is 2:15 PM in Kathmandu.
Do Tehran and Kathmandu use different time zones?
Tehran (Iran) uses IRST at UTC+03:30, while Kathmandu (Nepal) uses NPT at UTC+05:45. The IANA identifiers are Asia/Tehran and Asia/Kathmandu.
Does daylight saving time affect the Tehran–Kathmandu difference?
Neither zone observes daylight saving time, so the +2h 15m offset between Tehran and Kathmandu 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 Kathmandu?
Not normally. The +2h 15m gap only pushes the date over for late-evening times.
What is the time difference between Tehran and Kathmandu?
Kathmandu is +2h 15m 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 Kathmandu in?
Kathmandu operates on Nepal Time (NPT), one of the world's unique UTC+5:45 timezones. This 15-minute offset from India makes Nepal time distinctive for global coordination.
What are the business hours in Tehran?
Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.
What are the business hours in Kathmandu?
Standard business hours in Kathmandu are 10:00 AM - 5:00 PM NPT.
What is the best time to schedule a call between Tehran and Kathmandu?
The best overlap for a call is when both cities are in business hours. Tehran works 8:00 AM - 4:00 PM IRST and Kathmandu works 10:00 AM - 5:00 PM NPT (+2h 15m difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Tehran and Kathmandu?
Tehran uses IRR (﷼) while Kathmandu uses NPR (रू). Check current exchange rates when planning travel or business between these cities.
How do Tehran and Kathmandu compare in size?
Tehran has a population of approximately 9.4 million (metro: 16.8 million), while Kathmandu has approximately 1.4 million (metro: 3.0 million).
What are the major landmarks in Tehran and Kathmandu?
Tehran is known for Azadi Tower, Golestan Palace, Grand Bazaar. Kathmandu is famous for Boudhanath Stupa, Swayambhunath, Durbar Square.
Do Tehran and Kathmandu have stock exchanges?
Yes. Tehran has the TSE (Tehran Stock Exchange) and Kathmandu has the NEPSE (Nepal Stock Exchange). The +2h 15m time difference affects trading hour overlaps between these exchanges.
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 NPT timezone?
Major cities in the NPT timezone include Kathmandu, Pokhara, Lalitpur, Bharatpur, Biratnagar.
What is the UTC offset for NPT?
Nepal Time (NPT) is at UTC+05:45.
What should I know about the NPT timezone?
Nepal Time is UTC+05:45 — a 45-minute offset, not a whole or half hour. The 45-minute offset was adopted in 1986 to match Kathmandu's solar time.
When is it midnight in Tehran, what time is it in Kathmandu?
When it is 12:00 AM (midnight) in Tehran (IRST), it is +2h 15m later in Kathmandu (NPT).
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