Does it handle Daylight Saving Time?

Yes, the tool automatically adjusts for Daylight Saving Time based on the specific date you select, ensuring accurate conversions year-round.

Can I add multiple cities?

Yes, you can add as many cities as you need to the dashboard to compare times across your entire global network simultaneously.

Kathmandu to IRST

-2h 15m

Kathmandu

NPTSOURCE

Nepal · UTC+05:45

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

IRST

UTC+03:30

HH09

MM45

09:45 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Kathmandu

IRST

12:00 AM

9:45 PM-1

2:00 AM

11:45 PM-1

4:00 AM

1:45 AM

6:00 AM

3:45 AM

8:00 AM

5:45 AM

10:00 AM

7:45 AM

12:00 PM

9:45 AM

2:00 PM

11:45 AM

4:00 PM

1:45 PM

6:00 PM

3:45 PM

8:00 PM

5:45 PM

10:00 PM

7:45 PM

Green 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 Zone

→

IRST Zone

Explore all world timezones interactively →

NPT – Nepal Time

UTC+05:45

Nepal 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.

Countries in NPT

Nepal

Major Cities in NPT

KathmanduPokharaLalitpurBharatpurBiratnagar

Key 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.
•Nepal does not observe daylight saving time.
•Nepal is 15 minutes ahead of India, despite sharing a long open border.

Daylight Saving:No – UTC+05:45 year-round

Learn more about NPT on Wikipedia

IRST – Iran Standard Time

UTC+03:30

Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.

Countries in IRST

Iran

Major Cities in IRST

TehranIsfahanMashhadTabrizShirazKaraj

Key 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).
•Tehran has a metropolitan population of over 16 million.

Daylight Saving:Yes – switches to IRDT

Learn more about IRST on Wikipedia

About Kathmandu

Wikipedia

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.

Population:1.4 million

Metro:3.0 million

Business Hours:10:00 AM - 5:00 PM NPT

Currency:NPR (रू)

Stock Exchange:NEPSE (Nepal Stock Exchange)

Key Landmarks

Boudhanath StupaSwayambhunathDurbar SquarePashupatinath TempleGarden of Dreams

Did You Know?

Nepal Time (NPT) is one of only three timezones offset by 45 minutes (UTC+5:45).

Learn more about NPT timezone →

Comparing Time Zones: Kathmandu and IRST

Kathmandu runs on Nepal Time (NPT) at UTC+05:45. IRST runs on Iran Standard Time (IRST) at UTC+03:30. That puts Kathmandu 2 hours 15 minutes behind IRST — 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 IRST. Midnight in Kathmandu is 9:45 PM in IRST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Kathmandu to IRST time conversion table

Kathmandu (NPT)	IRST (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 IRST time

Scheduling a call from Kathmandu to IRST: a 10:00 AM start in Kathmandu lands at 7:45 AM in IRST, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Kathmandu and IRST 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.
Watching a live event or market open: Kathmandu viewers need 6:45 AM in IRST to catch a 9:00 AM start there, and 2:15 AM if the event is anchored to Kathmandu.

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 IRST 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 IRST

Both Kathmandu and IRST 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 IRST 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 IRST (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:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between Kathmandu and IRST?

Kathmandu (NPT, UTC+05:45) is 2 hours 15 minutes behind IRST (IRST, UTC+03:30). The gap is currently -2h 15m.

How do I convert Kathmandu time to IRST time?

Add -2h 15m to Kathmandu local time. For example, 9:00 AM in Kathmandu is 6:45 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 -2h 15m offset from Kathmandu.

What is the best time to call IRST 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 IRST?

Kathmandu is 2 hours 15 minutes behind IRST. When it is 12:00 PM in Kathmandu it is 9:45 AM in IRST.

Do Kathmandu and IRST use different time zones?

Kathmandu (Nepal) uses NPT at UTC+05:45, while IRST uses IRST at UTC+03:30. The IANA identifiers are Asia/Kathmandu and Asia/Tehran.

Does daylight saving time affect the Kathmandu–IRST difference?

Neither zone observes daylight saving time, so the -2h 15m offset between Kathmandu and IRST 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 IRST?

Not normally. The -2h 15m gap only pushes the date over the previous day.

What is the time difference between Kathmandu and IRST?

IRST 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.