Kathmandu to Tehran
-2h 15mKathmandu
NPTSOURCETehran
IRSTGreen rows indicate typical business hours (9 AM - 5 PM)
NPT and IRST on the World Map
The map below highlights the NPT (Nepal Time) and IRST (Iran Standard Time) timezone regions across the globe.
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.
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 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).
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).
Everything You Need to Know About Kathmandu and Tehran Time
Kathmandu runs on Nepal Time (NPT) at UTC+05:45. Tehran runs on Iran Standard Time (IRST) at UTC+03:30. That puts Kathmandu 2 hours 15 minutes behind Tehran — a difference of -2h 15m at the current offsets.
In practice, when it is 9:00 AM in Kathmandu it is 6:45 AM in Tehran. Midnight in Kathmandu is 9:45 PM in Tehran. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Kathmandu to Tehran time conversion table
| Kathmandu (NPT) | Tehran (IRST) | Day |
|---|---|---|
| 12:00 AM | 9:45 PM | previous day |
| 6:00 AM | 3:45 AM | same day |
| 7:00 AM | 4:45 AM | same day |
| 8:00 AM | 5:45 AM | same day |
| 9:00 AM | 6:45 AM | same day |
| 12:00 PM | 9:45 AM | same day |
| 3:00 PM | 12:45 PM | same day |
| 5:00 PM | 2:45 PM | same day |
| 6:00 PM | 3:45 PM | same day |
| 9:00 PM | 6:45 PM | same day |
Why people convert Kathmandu to Tehran time
- Scheduling a call from Kathmandu to Tehran: a 10:00 AM start in Kathmandu lands at 7:45 AM in Tehran, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Kathmandu and Tehran are inside the 9-to-5 working day between 11:15 AM and 5:00 PM NPT time (9:00 AM–2:45 PM IRST). That is roughly 5 hours 45 minutes of usable overlap.
- Coordinating a Kathmandu-based team with Tehran 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 NPT" is unambiguous; "3 PM" across a -2h 15m gap is not.
- Block 11:15 AM–5:00 PM NPT as the recurring meeting window if you work primarily from Kathmandu and need Tehran colleagues present.
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).
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 Kathmandu and Tehran
Both Kathmandu and Tehran sit inside the 9 AM – 5 PM working day between 11:15 AM–5:00 PM NPT, which is 9:00 AM–2:45 PM IRST. That gives roughly 5 hours and 45 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Kathmandu and Tehran share 5 hours of working-hours overlap (11:15 AM–5:00 PM NPT), so scheduling a live meeting is straightforward.
Kathmandu is 2 hours 15 minutes behind Tehran (NPT UTC+05:45 → IRST UTC+03:30). The shared working window is 11:15 AM–5:00 PM NPT. 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 Kathmandu and Tehran?
Kathmandu (NPT, UTC+05:45) is 2 hours 15 minutes behind Tehran (IRST, UTC+03:30). The gap is currently -2h 15m.
How do I convert Kathmandu time to Tehran time?
Add -2h 15m to Kathmandu local time. For example, 9:00 AM in Kathmandu is 6:45 AM in Tehran.
What time is it in Tehran right now?
Tehran 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 -2h 15m offset from Kathmandu.
What is the best time to call Tehran from Kathmandu?
Call between 11:15 AM and 5:00 PM NPT — that maps to 9:00 AM–2:45 PM IRST and keeps both parties inside the working day.
Which is behind, Kathmandu or Tehran?
Kathmandu is 2 hours 15 minutes behind Tehran. When it is 12:00 PM in Kathmandu it is 9:45 AM in Tehran.
Do Kathmandu and Tehran use different time zones?
Kathmandu (Nepal) uses NPT at UTC+05:45, while Tehran (Iran) uses IRST at UTC+03:30. The IANA identifiers are Asia/Kathmandu and Asia/Tehran.
Does daylight saving time affect the Kathmandu–Tehran difference?
Neither zone observes daylight saving time, so the -2h 15m offset between Kathmandu and Tehran is fixed all year.
Which other cities share Kathmandu's time zone?
NPT also covers Kathmandu, Pokhara, Lalitpur, Bharatpur, Biratnagar.
Which countries use NPT, Kathmandu's zone?
NPT is used in Nepal.
Is there a day difference between Kathmandu and Tehran?
Not normally. The -2h 15m gap only pushes the date over the previous day.
What is the time difference between Kathmandu and Tehran?
Tehran is -2h 15m from Kathmandu.
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 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 are the business hours in Kathmandu?
Standard business hours in Kathmandu are 10:00 AM - 5:00 PM NPT.
What are the business hours in Tehran?
Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.
What is the best time to schedule a call between Kathmandu and Tehran?
The best overlap for a call is when both cities are in business hours. Kathmandu works 10:00 AM - 5:00 PM NPT and Tehran works 8:00 AM - 4:00 PM IRST (-2h 15m difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Kathmandu and Tehran?
Kathmandu uses NPR (रू) while Tehran uses IRR (﷼). Check current exchange rates when planning travel or business between these cities.
How do Kathmandu and Tehran compare in size?
Kathmandu has a population of approximately 1.4 million (metro: 3.0 million), while Tehran has approximately 9.4 million (metro: 16.8 million).
What are the major landmarks in Kathmandu and Tehran?
Kathmandu is known for Boudhanath Stupa, Swayambhunath, Durbar Square. Tehran is famous for Azadi Tower, Golestan Palace, Grand Bazaar.
Do Kathmandu and Tehran have stock exchanges?
Yes. Kathmandu has the NEPSE (Nepal Stock Exchange) and Tehran has the TSE (Tehran Stock Exchange). The -2h 15m time difference affects trading hour overlaps between these exchanges.
Which countries use NPT (Nepal Time)?
NPT is used in Nepal.
Does NPT observe daylight saving time?
No, NPT does not observe daylight saving time and remains at UTC+05:45 year-round.
What are some interesting facts about NPT?
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.
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 Kathmandu, what time is it in Tehran?
When it is 12:00 AM (midnight) in Kathmandu (NPT), it is -2h 15m later in Tehran (IRST).
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