NPT to HST Time Converter
HST is 15 hours and 45 minutes behind NPT. NPT is UTC+5:45, and HST is UTC-10:00.
Best Time to Call Between NPT and HST
Standard 9-to-5 hours in these two zones never overlap, so someone has to take the call outside their working day. The most workable window is 7:00 AM to 2:00 PM NPT, which is 3:15 PM to 10:15 PM HST.
both at work NPT only HST only neither — hours along the strip are NPT.
Common Times Converted
NPT on the left, HST on the right.
NPT to HST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| NPT | HST | Working hours |
|---|---|---|
| 12:00 AM | 8:15 AM prev day | — |
| 1:00 AM | 9:15 AM prev day | HST only |
| 2:00 AM | 10:15 AM prev day | HST only |
| 3:00 AM | 11:15 AM prev day | HST only |
| 4:00 AM | 12:15 PM prev day | HST only |
| 5:00 AM | 1:15 PM prev day | HST only |
| 6:00 AM | 2:15 PM prev day | HST only |
| 7:00 AM | 3:15 PM prev day | HST only |
| 8:00 AM | 4:15 PM prev day | HST only |
| 9:00 AM | 5:15 PM prev day | NPT only |
| 10:00 AM | 6:15 PM prev day | NPT only |
| 11:00 AM | 7:15 PM prev day | NPT only |
| 12:00 PM | 8:15 PM prev day | NPT only |
| 1:00 PM | 9:15 PM prev day | NPT only |
| 2:00 PM | 10:15 PM prev day | NPT only |
| 3:00 PM | 11:15 PM prev day | NPT only |
| 4:00 PM | 12:15 AM | NPT only |
| 5:00 PM | 1:15 AM | — |
| 6:00 PM | 2:15 AM | — |
| 7:00 PM | 3:15 AM | — |
| 8:00 PM | 4:15 AM | — |
| 9:00 PM | 5:15 AM | — |
| 10:00 PM | 6:15 AM | — |
| 11:00 PM | 7:15 AM | — |
What NPT and HST Actually Are
NPT — Nepal Time
Kathmandu, Pokhara. Standing at UTC+5:45 as written, and the region does not change its clocks, so that offset holds all year. Nepal sits at UTC+5:45 — one of only two zones in the world on a 45-minute offset.
Nepal is deliberately 15 minutes ahead of India, an offset chosen so the country keeps its own time rather than sharing its neighbor's.
HST — Hawaii Standard Time
Honolulu and the rest of Hawaii. Standing at UTC-10:00 as written, and the region does not change its clocks, so that offset holds all year. Hawaii does not observe daylight saving, so this offset holds all year.
Hawaii dropped daylight saving in 1967 and never resumed it. Being close to the equator, its daylight barely varies across the year, so there is little to gain.
What This Means in Practice
Expect times on the half hour
NPT sits on a 45-minute offset rather than a whole hour, so a round number on one side is never a round number on the other. A 9:00 meeting becomes 45 minutes past the hour, which is exactly the detail calendar invitations get wrong when someone converts in their head.
The date changes mid-working-day
For 7 of the eight hours in a normal NPT working day, the equivalent HST time falls on a different calendar date. Anything scheduled in that stretch needs the date checked as well as the time, or a Tuesday call quietly becomes a Wednesday one at the other end.
A gap you can rely on
Neither region changes its clocks, so this difference holds every day of the year. A recurring meeting booked once stays correct — worth knowing, because most cross-border pairs cannot say that.
Nearly opposite sides of the clock
At 15 hours and 45 minutes apart, one side's morning is the other side's night. Handing work over at the end of a shift usually beats trying to get both parties in the same call.
Major Cities in Each Zone
Cities on NPT
Cities on HST
Frequently Asked Questions
What is the time difference between NPT and HST?
HST is 15 hours and 45 minutes behind NPT.
What is 9:00 AM NPT in HST?
9:00 AM NPT is 5:15 PM the previous day HST.
What are the best hours to schedule a call between NPT and HST?
Standard business hours in these two zones do not overlap at all, so one side has to work outside the 9-to-5. The most workable window is 7:00 AM to 2:00 PM NPT, which is 3:15 PM to 10:15 PM HST.
Does the difference between NPT and HST change during the year?
No. Neither region changes its clocks, so this gap is fixed all year round.
Does NPT always mean Nepal Time?
Nepal sits at UTC+5:45 — one of only two zones in the world on a 45-minute offset.
Does HST always mean Hawaii Standard Time?
Hawaii does not observe daylight saving, so this offset holds all year.