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).

NPT to AST

-9h 45m

NPT

NPTSOURCE

UTC+05:45

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

AST

UTC-03:00☀ DST active

HH02

MM15

02:15 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

NPT

AST

12:00 AM

3:15 PM-1

2:00 AM

5:15 PM-1

4:00 AM

7:15 PM-1

6:00 AM

9:15 PM-1

8:00 AM

11:15 PM-1

10:00 AM

1:15 AM

12:00 PM

3:15 AM

2:00 PM

5:15 AM

4:00 PM

7:15 AM

6:00 PM

9:15 AM

8:00 PM

11:15 AM

10:00 PM

1:15 PM

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

NPT and AST on the World Map

The map below highlights the NPT (Nepal Time) and AST (Atlantic Standard Time) timezone regions across the globe.

NPT Zone

→

AST 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

AST – Atlantic Standard Time

UTC-04:00

Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.

Countries in AST

Canada (Atlantic provinces)Puerto RicoUS Virgin IslandsDominican RepublicVenezuelaBoliviaBarbadosTrinidad and Tobago

Major Cities in AST

HalifaxSan JuanSanto DomingoCaracasLa PazFrederictonCharlottetown

Key Facts about AST

•Puerto Rico uses AST year-round and does not observe DST.
•AST is 1 hour ahead of EST.
•Halifax, the capital of Nova Scotia, is the largest city in AST Canada.

Daylight Saving:Yes – switches to ADT

Learn more about AST on Wikipedia

Understanding the -9h 45m Gap: NPT vs AST

NPT runs on Nepal Time (NPT) at UTC+05:45. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts NPT 9 hours 45 minutes behind AST — a difference of -9h 45m at the current offsets.

In practice, when it is 9:00 AM in NPT it is 11:15 PM in AST on the previous day. Midnight in NPT is 2:15 PM in AST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

NPT to AST time conversion table

NPT (NPT)	AST (AST)	Day
12:00 AM	2:15 PM	previous day
6:00 AM	8:15 PM	previous day
7:00 AM	9:15 PM	previous day
8:00 AM	10:15 PM	previous day
9:00 AM	11:15 PM	previous day
12:00 PM	2:15 AM	same day
3:00 PM	5:15 AM	same day
5:00 PM	7:15 AM	same day
6:00 PM	8:15 AM	same day
9:00 PM	11:15 AM	same day

Why people convert NPT to AST time

Scheduling a call from NPT to AST: a 10:00 AM start in NPT lands at 12:15 AM in AST, so you can confirm the slot without doing the arithmetic yourself.
Handling a -9h 45m gap: NPT and AST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in AST is 11:15 PM in NPT.
Watching a live event or market open: NPT viewers need 11:15 PM in AST to catch a 9:00 AM start there, and 9:45 AM if the event is anchored to NPT.

Always state the zone abbreviation, not just the hour. "3:00 PM NPT" is unambiguous; "3 PM" across a -9h 45m gap is not.
With a -9h 45m gap there is no shared 9-to-5 window, so alternate the early start: one week NPT takes the early slot, the next week AST does.

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 AST (Atlantic Standard Time)

Atlantic Standard Time (AST) covers Canada's Atlantic provinces (Nova Scotia, New Brunswick, Prince Edward Island, and most of Labrador), as well as several Caribbean nations. Puerto Rico and the US Virgin Islands use AST year-round without daylight saving time. The Canadian provinces switch to Atlantic Daylight Time (ADT) in summer.

Best time to call between NPT and AST

With a -9h 45m offset there is no overlap inside a normal 9 AM – 5 PM day. AST opens at 9:00 AM AST, which is 11:15 PM in NPT, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

NPT and AST have no shared working hours because of the -9h 45m gap. Teams need to alternate early starts or rely on asynchronous handovers.

NPT is 9 hours 45 minutes behind AST (NPT UTC+05:45 → AST UTC-04:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

NPT

Does not observe DST

AST

☀ Currently in DST

Standard: UTC-04:00 · DST: UTC-03:00

Clocks fall back on Sun, Nov 1, 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 NPT and AST?

NPT (NPT, UTC+05:45) is 9 hours 45 minutes behind AST (AST, UTC-04:00). The gap is currently -9h 45m.

How do I convert NPT time to AST time?

Add -9h 45m to NPT local time. For example, 9:00 AM in NPT is 11:15 PM in AST (previous day).

What time is it in AST right now?

AST uses AST at UTC-04:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -9h 45m offset from NPT.