HST to Kathmandu
+15h 45mHST
HSTSOURCEKathmandu
NPTGreen rows indicate typical business hours (9 AM - 5 PM)
HST and NPT on the World Map
The map below highlights the HST (Hawaii Standard Time) and NPT (Nepal Time) timezone regions across the globe.
HST – Hawaii Standard Time
UTC-10:00Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.
- •Hawaii does not observe daylight saving time.
- •HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
- •Hawaii is one of only two US states that don't observe DST (the other is Arizona).
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.
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).
Time Conversion Guide: HST to Kathmandu
HST runs on Hawaii Standard Time (HST) at UTC-10:00. Kathmandu runs on Nepal Time (NPT) at UTC+05:45. That puts HST 15 hours 45 minutes ahead of Kathmandu — a difference of +15h 45m at the current offsets.
In practice, when it is 9:00 AM in HST it is 12:45 AM in Kathmandu on the next day. Midnight in HST is 3:45 PM in Kathmandu. Neither zone observes daylight saving time, so the offset between them stays constant all year.
HST to Kathmandu time conversion table
| HST (HST) | Kathmandu (NPT) | Day |
|---|---|---|
| 12:00 AM | 3:45 PM | same day |
| 6:00 AM | 9:45 PM | same day |
| 7:00 AM | 10:45 PM | same day |
| 8:00 AM | 11:45 PM | same day |
| 9:00 AM | 12:45 AM | next day |
| 12:00 PM | 3:45 AM | next day |
| 3:00 PM | 6:45 AM | next day |
| 5:00 PM | 8:45 AM | next day |
| 6:00 PM | 9:45 AM | next day |
| 9:00 PM | 12:45 PM | next day |
Why people convert HST to Kathmandu time
- Scheduling a call from HST to Kathmandu: a 10:00 AM start in HST lands at 1:45 AM in Kathmandu the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +15h 45m gap: HST and Kathmandu 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 Kathmandu is 12:45 AM in HST.
- Booking travel or deliveries: tracking Kathmandu local time against HST keeps pickup windows and arrival estimates honest across the +15h 45m offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM HST" is unambiguous; "3 PM" across a +15h 45m gap is not.
- With a +15h 45m gap there is no shared 9-to-5 window, so alternate the early start: one week HST takes the early slot, the next week Kathmandu does.
About HST (Hawaii Standard Time)
Hawaii Standard Time (HST) is used in the state of Hawaii and does not observe daylight saving time. This makes HST one of the most consistent time zones in the US. The Hawaiian Islands are among the last places on Earth to see a new calendar day.
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 HST and Kathmandu
With a +15h 45m offset there is no overlap inside a normal 9 AM – 5 PM day. Kathmandu opens at 9:00 AM NPT, which is 12:45 AM in HST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
HST and Kathmandu have no shared working hours because of the +15h 45m gap. Teams need to alternate early starts or rely on asynchronous handovers.
HST is 15 hours 45 minutes ahead of Kathmandu (HST UTC-10:00 → 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.
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 HST and Kathmandu?
HST (HST, UTC-10:00) is 15 hours 45 minutes ahead of Kathmandu (NPT, UTC+05:45). The gap is currently +15h 45m.
How do I convert HST time to Kathmandu time?
Add +15h 45m to HST local time. For example, 9:00 AM in HST is 12:45 AM in Kathmandu (next day).
What time is it in Kathmandu right now?
Kathmandu 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 +15h 45m offset from HST.
What is the best time to call Kathmandu from HST?
There is no shared working-hours window because of the +15h 45m gap. The closest option is 1:00 PM in HST, which is 4:45 AM in Kathmandu.
Which is ahead, HST or Kathmandu?
HST is 15 hours 45 minutes ahead of Kathmandu. When it is 12:00 PM in HST it is 3:45 AM in Kathmandu.
Do HST and Kathmandu use different time zones?
HST uses HST at UTC-10:00, while Kathmandu (Nepal) uses NPT at UTC+05:45. The IANA identifiers are Pacific/Honolulu and Asia/Kathmandu.
Does daylight saving time affect the HST–Kathmandu difference?
Neither zone observes daylight saving time, so the +15h 45m offset between HST and Kathmandu is fixed all year.
Which other cities share HST's time zone?
HST also covers Honolulu, Hilo, Kailua, Pearl City, Kapolei.
Which countries use HST, HST's zone?
HST is used in United States (Hawaii).
Is there a day difference between HST and Kathmandu?
Sometimes. The +15h 45m gap is large enough that 8:00 PM or later in HST already falls on the next day in Kathmandu.
What is the time difference between HST and Kathmandu?
Kathmandu is +15h 45m from HST.
What timezone is HST in?
HST operates on its local timezone.
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 are the business hours in Kathmandu?
Standard business hours in Kathmandu are 10:00 AM - 5:00 PM NPT.
Which countries use HST (Hawaii Standard Time)?
HST is used in United States (Hawaii).
Does HST observe daylight saving time?
No, HST does not observe daylight saving time and remains at UTC-10:00 year-round.
What are some interesting facts about HST?
Hawaii does not observe daylight saving time. HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
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 HST, what time is it in Kathmandu?
When it is 12:00 AM (midnight) in HST (HST), it is +15h 45m later in Kathmandu (NPT).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More HST time conversions
- hst to honolulu
- hst to new york
- hst to london
- hst to dubai
- hst to tokyo
- hst to singapore
- hst to sydney
- hst to los angeles
- hst to paris
- hst to delhi
- hst to mumbai
- hst to berlin
- hst to hong kong
- hst to toronto
- new york to hst
- london to hst
- dubai to hst
- tokyo to hst
- singapore to hst
- sydney to hst
- los angeles to hst
- paris to hst
- delhi to hst
- mumbai to hst
- berlin to hst
- hong kong to hst
- toronto to hst
- kathmandu to hst
See every conversion from HST →·See every conversion from Kathmandu →