NPT to Colombo
-0h 15mNPT
NPTSOURCEColombo
ISTGreen rows indicate typical business hours (9 AM - 5 PM)
NPT and IST on the World Map
The map below highlights the NPT (Nepal Time) and IST (India Standard Time) timezone regions across the globe.
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.
IST – India Standard Time
UTC+05:30India Standard Time (IST) is the time zone for India and Sri Lanka, 5 hours and 30 minutes ahead of UTC.
- •India is 10 hours 30 minutes ahead of EST and 5 hours 30 minutes ahead of GMT.
- •India uses a single time zone despite spanning 30° of longitude.
- •IST is one of only a handful of time zones with a 30-minute offset.
- •IST is the most populous single time zone in the world with over 1.4 billion people.
- •The Bombay Stock Exchange (BSE) and National Stock Exchange (NSE) operate on IST.
About Colombo
WikipediaColombo operates on Sri Lanka Time (SLST), UTC+5:30. Sharing India's timezone, Colombo is a key South Asian trade and tourism hub.
Sri Lanka Standard Time (SLST) uses UTC+5:30, same offset as India.
NPT to Colombo Time Difference – Complete Guide
NPT runs on Nepal Time (NPT) at UTC+05:45. Colombo runs on India Standard Time (IST) at UTC+05:30. That puts NPT 15 minutes behind Colombo — a difference of -0h 15m at the current offsets.
In practice, when it is 9:00 AM in NPT it is 8:45 AM in Colombo. Midnight in NPT is 11:45 PM in Colombo. Neither zone observes daylight saving time, so the offset between them stays constant all year.
NPT to Colombo time conversion table
| NPT (NPT) | Colombo (IST) | Day |
|---|---|---|
| 12:00 AM | 11:45 PM | previous day |
| 6:00 AM | 5:45 AM | same day |
| 7:00 AM | 6:45 AM | same day |
| 8:00 AM | 7:45 AM | same day |
| 9:00 AM | 8:45 AM | same day |
| 12:00 PM | 11:45 AM | same day |
| 3:00 PM | 2:45 PM | same day |
| 5:00 PM | 4:45 PM | same day |
| 6:00 PM | 5:45 PM | same day |
| 9:00 PM | 8:45 PM | same day |
Why people convert NPT to Colombo time
- Scheduling a call from NPT to Colombo: a 10:00 AM start in NPT lands at 9:45 AM in Colombo, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both NPT and Colombo are inside the 9-to-5 working day between 9:15 AM and 5:00 PM NPT time (9:00 AM–4:45 PM IST). That is roughly 7 hours 45 minutes of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in NPT is 7:45 PM in Colombo makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM NPT" is unambiguous; "3 PM" across a -0h 15m gap is not.
- Block 9:15 AM–5:00 PM NPT as the recurring meeting window if you work primarily from NPT and need Colombo 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 IST (India Standard Time)
India Standard Time (IST) is the time observed throughout India and Sri Lanka. It is based on the 82.5°E meridian, passing through Mirzapur in Uttar Pradesh. India uses a single time zone despite spanning roughly 30° of longitude, which has been debated. IST does not observe daylight saving time. India is the world's most populous country, making IST one of the most-used time zones globally. The IT outsourcing industry and call centers operate primarily on IST, making the EST-to-IST conversion one of the most searched timezone conversions.
Best time to call between NPT and Colombo
Both NPT and Colombo sit inside the 9 AM – 5 PM working day between 9:15 AM–5:00 PM NPT, which is 9:00 AM–4:45 PM IST. That gives roughly 7 hours and 45 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
NPT and Colombo share 7 hours of working-hours overlap (9:15 AM–5:00 PM NPT), so scheduling a live meeting is straightforward.
NPT is 15 minutes behind Colombo (NPT UTC+05:45 → IST UTC+05:30). The shared working window is 9:15 AM–5:00 PM NPT. 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 NPT and Colombo?
NPT (NPT, UTC+05:45) is 15 minutes behind Colombo (IST, UTC+05:30). The gap is currently -0h 15m.
How do I convert NPT time to Colombo time?
Add -0h 15m to NPT local time. For example, 9:00 AM in NPT is 8:45 AM in Colombo.
What time is it in Colombo right now?
Colombo uses IST at UTC+05:30. Use the live converter at the top of this page — it updates in real time and already accounts for the -0h 15m offset from NPT.
What is the best time to call Colombo from NPT?
Call between 9:15 AM and 5:00 PM NPT — that maps to 9:00 AM–4:45 PM IST and keeps both parties inside the working day.
Which is behind, NPT or Colombo?
NPT is 15 minutes behind Colombo. When it is 12:00 PM in NPT it is 11:45 AM in Colombo.
Do NPT and Colombo use different time zones?
NPT uses NPT at UTC+05:45, while Colombo (Sri Lanka) uses IST at UTC+05:30. The IANA identifiers are Asia/Kathmandu and Asia/Colombo.
Does daylight saving time affect the NPT–Colombo difference?
Neither zone observes daylight saving time, so the -0h 15m offset between NPT and Colombo is fixed all year.
Which other cities share NPT's time zone?
NPT also covers Kathmandu, Pokhara, Lalitpur, Bharatpur, Biratnagar.
Which countries use NPT, NPT's zone?
NPT is used in Nepal.
Is there a day difference between NPT and Colombo?
Not normally. The -0h 15m gap only pushes the date over the previous day.
What is the time difference between NPT and Colombo?
Colombo is -0h 15m from NPT.
What timezone is NPT in?
NPT operates on its local timezone.
What timezone is Colombo in?
Colombo operates on Sri Lanka Time (SLST), UTC+5:30. Sharing India's timezone, Colombo is a key South Asian trade and tourism hub.
What are the business hours in Colombo?
Standard business hours in Colombo are 9:00 AM - 5:00 PM IST.
Which countries use NPT (Nepal Time)?
NPT is used in Nepal.
Does NPT observe daylight saving time?
No, NPT does not observe daylight saving time and remains at UTC+05:45 year-round.
What are some interesting 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.
Which cities are in the IST timezone?
Major cities in the IST timezone include Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad.
What is the UTC offset for IST?
India Standard Time (IST) is at UTC+05:30.
What should I know about the IST timezone?
India is 10 hours 30 minutes ahead of EST and 5 hours 30 minutes ahead of GMT. India uses a single time zone despite spanning 30° of longitude.
When is it midnight in NPT, what time is it in Colombo?
When it is 12:00 AM (midnight) in NPT (NPT), it is -0h 15m later in Colombo (IST).
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