Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

Kathmandu to ACST

+3h 45m

Kathmandu

NPTSOURCE

Nepal · UTC+05:45

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

ACST

UTC+09:30DST observed

HH03

MM45

15:45 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Kathmandu

ACST

12:00 AM

3:45 AM

2:00 AM

5:45 AM

4:00 AM

7:45 AM

6:00 AM

9:45 AM

8:00 AM

11:45 AM

10:00 AM

1:45 PM

12:00 PM

3:45 PM

2:00 PM

5:45 PM

4:00 PM

7:45 PM

6:00 PM

9:45 PM

8:00 PM

11:45 PM

10:00 PM

1:45 AM+1

Green rows indicate typical business hours (9 AM - 5 PM)

NPT and ACST on the World Map

The map below highlights the NPT (Nepal Time) and ACST (Australian Central Standard Time) timezone regions across the globe.

NPT Zone

→

ACST 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

ACST – Australian Central Standard Time

UTC+09:30

Australian Central Standard Time (ACST, UTC+09:30) covers South Australia and the Northern Territory, on a half-hour offset.

Countries in ACST

Australia (South Australia, Northern Territory)

Major Cities in ACST

AdelaideDarwinAlice SpringsMount Gambier

Key Facts about ACST

•ACST uses a half-hour offset: UTC+09:30.
•South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
•Adelaide and Darwin are 30 minutes apart during daylight saving, level in winter.
•Adelaide is one of the few major cities on a 30-minute offset.

Daylight Saving:Yes – switches to ACDT

Learn more about ACST 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 →

Understanding the +3h 45m Gap: Kathmandu vs ACST

Kathmandu runs on Nepal Time (NPT) at UTC+05:45. ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. That puts Kathmandu 3 hours 45 minutes ahead of ACST — a difference of +3h 45m at the current offsets.

In practice, when it is 9:00 AM in Kathmandu it is 12:45 PM in ACST. Midnight in Kathmandu is 3:45 AM in ACST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Kathmandu to ACST time conversion table

Kathmandu (NPT)	ACST (ACST)	Day
12:00 AM	3:45 AM	same day
6:00 AM	9:45 AM	same day
7:00 AM	10:45 AM	same day
8:00 AM	11:45 AM	same day
9:00 AM	12:45 PM	same day
12:00 PM	3:45 PM	same day
3:00 PM	6:45 PM	same day
5:00 PM	8:45 PM	same day
6:00 PM	9:45 PM	same day
9:00 PM	12:45 AM	next day

Why people convert Kathmandu to ACST time

Scheduling a call from Kathmandu to ACST: a 10:00 AM start in Kathmandu lands at 1:45 PM in ACST, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Kathmandu and ACST are inside the 9-to-5 working day between 9:00 AM and 1:15 PM NPT time (12:45 PM–5:00 PM ACST). That is roughly 4 hours 15 minutes of usable overlap.
Watching a live event or market open: Kathmandu viewers need 12:45 PM in ACST to catch a 9:00 AM start there, and 8:15 PM 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 +3h 45m gap is not.
Block 9:00 AM–1:15 PM NPT as the recurring meeting window if you work primarily from Kathmandu and need ACST 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 ACST (Australian Central Standard Time)

Australian Central Standard Time (ACST) is the half-hour offset of UTC+09:30 used across South Australia and the Northern Territory, taking in Adelaide and Darwin. South Australia moves to Australian Central Daylight Time (ACDT, UTC+10:30) from the first Sunday in October to the first Sunday in April, but the Northern Territory does not observe daylight saving — so Adelaide and Darwin sit 30 minutes apart in summer and level with each other in winter. The half-hour offset means Adelaide is 30 minutes behind Sydney in winter and level with it during daylight saving, which regularly catches out travellers and meeting planners.

Best time to call between Kathmandu and ACST

Both Kathmandu and ACST sit inside the 9 AM – 5 PM working day between 9:00 AM–1:15 PM NPT, which is 12:45 PM–5:00 PM ACST. That gives roughly 4 hours and 15 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

Kathmandu and ACST overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.

Kathmandu is 3 hours 45 minutes ahead of ACST (NPT UTC+05:45 → ACST UTC+09:30). The shared working window is 9:00 AM–1:15 PM NPT. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

Kathmandu

Does not observe DST

ACST

❄ Currently in Standard Time

Standard: UTC+09:30 · DST: UTC+10:30

Clocks spring forward on Sat, Oct 3, 2026

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 ACST?

Kathmandu (NPT, UTC+05:45) is 3 hours 45 minutes ahead of ACST (ACST, UTC+09:30). The gap is currently +3h 45m.

How do I convert Kathmandu time to ACST time?

Add +3h 45m to Kathmandu local time. For example, 9:00 AM in Kathmandu is 12:45 PM in ACST.

What time is it in ACST right now?

ACST uses ACST at UTC+09:30. Use the live converter at the top of this page — it updates in real time and already accounts for the +3h 45m offset from Kathmandu.

What is the best time to call ACST from Kathmandu?

Call between 9:00 AM and 1:15 PM NPT — that maps to 12:45 PM–5:00 PM ACST and keeps both parties inside the working day.

Which is ahead, Kathmandu or ACST?

Kathmandu is 3 hours 45 minutes ahead of ACST. When it is 12:00 PM in Kathmandu it is 3:45 PM in ACST.

Do Kathmandu and ACST use different time zones?

Kathmandu (Nepal) uses NPT at UTC+05:45, while ACST uses ACST at UTC+09:30. The IANA identifiers are Asia/Kathmandu and Australia/Adelaide.

Does daylight saving time affect the Kathmandu–ACST difference?

Neither zone observes daylight saving time, so the +3h 45m offset between Kathmandu and ACST 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 ACST?

Not normally. The +3h 45m gap only pushes the date over for late-evening times.

What is the time difference between Kathmandu and ACST?

ACST is +3h 45m 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.