Colombo to NPT
+0h 15mColombo
ISTSOURCENPT
NPTGreen rows indicate typical business hours (9 AM - 5 PM)
IST and NPT on the World Map
The map below highlights the IST (India Standard Time) and NPT (Nepal Time) timezone regions across the globe.
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.
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 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.
Colombo to NPT Time Difference – Complete Guide
Colombo runs on India Standard Time (IST) at UTC+05:30. NPT runs on Nepal Time (NPT) at UTC+05:45. That puts Colombo 15 minutes ahead of NPT — a difference of +0h 15m at the current offsets.
In practice, when it is 9:00 AM in Colombo it is 9:15 AM in NPT. Midnight in Colombo is 12:15 AM in NPT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Colombo to NPT time conversion table
| Colombo (IST) | NPT (NPT) | Day |
|---|---|---|
| 12:00 AM | 12:15 AM | same day |
| 6:00 AM | 6:15 AM | same day |
| 7:00 AM | 7:15 AM | same day |
| 8:00 AM | 8:15 AM | same day |
| 9:00 AM | 9:15 AM | same day |
| 12:00 PM | 12:15 PM | same day |
| 3:00 PM | 3:15 PM | same day |
| 5:00 PM | 5:15 PM | same day |
| 6:00 PM | 6:15 PM | same day |
| 9:00 PM | 9:15 PM | same day |
Why people convert Colombo to NPT time
- Scheduling a call from Colombo to NPT: a 10:00 AM start in Colombo lands at 10:15 AM in NPT, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Colombo and NPT are inside the 9-to-5 working day between 9:00 AM and 4:45 PM IST time (9:15 AM–5:00 PM NPT). That is roughly 7 hours 45 minutes of usable overlap.
- Watching a live event or market open: Colombo viewers need 9:15 AM in NPT to catch a 9:00 AM start there, and 11:45 PM if the event is anchored to Colombo.
- Always state the zone abbreviation, not just the hour. "3:00 PM IST" is unambiguous; "3 PM" across a +0h 15m gap is not.
- Block 9:00 AM–4:45 PM IST as the recurring meeting window if you work primarily from Colombo and need NPT colleagues present.
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.
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 Colombo and NPT
Both Colombo and NPT sit inside the 9 AM – 5 PM working day between 9:00 AM–4:45 PM IST, which is 9:15 AM–5:00 PM NPT. That gives roughly 7 hours and 45 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Colombo and NPT share 7 hours of working-hours overlap (9:00 AM–4:45 PM IST), so scheduling a live meeting is straightforward.
Colombo is 15 minutes ahead of NPT (IST UTC+05:30 → NPT UTC+05:45). The shared working window is 9:00 AM–4:45 PM IST. 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 Colombo and NPT?
Colombo (IST, UTC+05:30) is 15 minutes ahead of NPT (NPT, UTC+05:45). The gap is currently +0h 15m.
How do I convert Colombo time to NPT time?
Add +0h 15m to Colombo local time. For example, 9:00 AM in Colombo is 9:15 AM 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 +0h 15m offset from Colombo.
What is the best time to call NPT from Colombo?
Call between 9:00 AM and 4:45 PM IST — that maps to 9:15 AM–5:00 PM NPT and keeps both parties inside the working day.
Which is ahead, Colombo or NPT?
Colombo is 15 minutes ahead of NPT. When it is 12:00 PM in Colombo it is 12:15 PM in NPT.
Do Colombo and NPT use different time zones?
Colombo (Sri Lanka) uses IST at UTC+05:30, while NPT uses NPT at UTC+05:45. The IANA identifiers are Asia/Colombo and Asia/Kathmandu.
Does daylight saving time affect the Colombo–NPT difference?
Neither zone observes daylight saving time, so the +0h 15m offset between Colombo and NPT is fixed all year.
Which other cities share Colombo's time zone?
IST also covers Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad and 4 more.
Which countries use IST, Colombo's zone?
IST is used in India, Sri Lanka.
Is there a day difference between Colombo and NPT?
Not normally. The +0h 15m gap only pushes the date over for late-evening times.
What is the time difference between Colombo and NPT?
NPT is +0h 15m from Colombo.
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 timezone is NPT in?
NPT operates on its local timezone.
What are the business hours in Colombo?
Standard business hours in Colombo are 9:00 AM - 5:00 PM IST.
Which countries use IST (India Standard Time)?
IST is used in India, Sri Lanka.
Does IST observe daylight saving time?
No, IST does not observe daylight saving time and remains at UTC+05:30 year-round.
What are some interesting facts about IST?
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.
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 Colombo, what time is it in NPT?
When it is 12:00 AM (midnight) in Colombo (IST), it is +0h 15m later in NPT (NPT).
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