AST to NPT
+9h 45mAST
ASTSOURCENPT
NPTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and NPT on the World Map
The map below highlights the AST (Atlantic Standard Time) and NPT (Nepal Time) timezone regions across the globe.
AST – Atlantic Standard Time
UTC-04:00Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.
- •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.
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.
Understanding the +9h 45m Gap: AST vs NPT
AST runs on Atlantic Standard Time (AST) at UTC-04:00. NPT runs on Nepal Time (NPT) at UTC+05:45. That puts AST 9 hours 45 minutes ahead of NPT — a difference of +9h 45m at the current offsets.
In practice, when it is 9:00 AM in AST it is 6:45 PM in NPT. Midnight in AST is 9:45 AM in NPT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to NPT time conversion table
| AST (AST) | NPT (NPT) | Day |
|---|---|---|
| 12:00 AM | 9:45 AM | same day |
| 6:00 AM | 3:45 PM | same day |
| 7:00 AM | 4:45 PM | same day |
| 8:00 AM | 5:45 PM | same day |
| 9:00 AM | 6:45 PM | same day |
| 12:00 PM | 9:45 PM | same day |
| 3:00 PM | 12:45 AM | next day |
| 5:00 PM | 2:45 AM | next day |
| 6:00 PM | 3:45 AM | next day |
| 9:00 PM | 6:45 AM | next day |
Why people convert AST to NPT time
- Scheduling a call from AST to NPT: a 10:00 AM start in AST lands at 7:45 PM in NPT, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +9h 45m gap: AST and NPT 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 NPT is 6:45 PM in AST.
- Booking travel or deliveries: tracking NPT local time against AST keeps pickup windows and arrival estimates honest across the +9h 45m offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" 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 AST takes the early slot, the next week NPT does.
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.
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 AST and NPT
With a +9h 45m offset there is no overlap inside a normal 9 AM – 5 PM day. NPT opens at 9:00 AM NPT, which is 6:45 PM in AST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
AST and NPT have no shared working hours because of the +9h 45m gap. Teams need to alternate early starts or rely on asynchronous handovers.
AST is 9 hours 45 minutes ahead of NPT (AST UTC-04:00 → NPT UTC+05:45). 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
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
NPT
Does not observe DST
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 AST and NPT?
AST (AST, UTC-04:00) is 9 hours 45 minutes ahead of NPT (NPT, UTC+05:45). The gap is currently +9h 45m.
How do I convert AST time to NPT time?
Add +9h 45m to AST local time. For example, 9:00 AM in AST is 6:45 PM in NPT.
What time is it in NPT right now?
NPT 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 +9h 45m offset from AST.
What is the best time to call NPT from AST?
There is no shared working-hours window because of the +9h 45m gap. The closest option is 1:00 PM in AST, which is 10:45 PM in NPT.
Which is ahead, AST or NPT?
AST is 9 hours 45 minutes ahead of NPT. When it is 12:00 PM in AST it is 9:45 PM in NPT.
Does daylight saving time affect the AST–NPT difference?
Neither zone observes daylight saving time, so the +9h 45m offset between AST and NPT is fixed all year.
Which other cities share AST's time zone?
AST also covers Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
Which countries use AST, AST's zone?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, Barbados, Trinidad and Tobago.
Is there a day difference between AST and NPT?
Not normally. The +9h 45m gap only pushes the date over for late-evening times.
What is the time difference between AST and NPT?
NPT is +9h 45m from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is NPT in?
NPT operates on its local timezone.
Which countries use AST (Atlantic Standard Time)?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, and 2 more countries.
Does AST observe daylight saving time?
Yes, AST switches to ADT during summer months.
What are some interesting facts about AST?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
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 AST, what time is it in NPT?
When it is 12:00 AM (midnight) in AST (AST), it is +9h 45m later in NPT (NPT).
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See every conversion from AST →·See every conversion from NPT →