Honolulu to Colombo
+15h 30mHonolulu
HSTSOURCEColombo
ISTGreen rows indicate typical business hours (9 AM - 5 PM)
HST and IST on the World Map
The map below highlights the HST (Hawaii Standard Time) and IST (India Standard 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).
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 Honolulu
WikipediaHonolulu operates on Hawaii Standard Time (HST), UTC-10 with no daylight saving. Hawaii's consistent time makes it a predictable connection between Asia and mainland USA.
Pearl Harbor memorial receives over 2 million visitors annually.
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.
Everything You Need to Know About Honolulu and Colombo Time
Honolulu runs on Hawaii-Aleutian Standard Time (HST) at UTC-10:00. Colombo runs on India Standard Time (IST) at UTC+05:30. That puts Honolulu 15 hours 30 minutes ahead of Colombo — a difference of +15h 30m at the current offsets.
In practice, when it is 9:00 AM in Honolulu it is 12:30 AM in Colombo on the next day. Midnight in Honolulu is 3:30 PM in Colombo. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Honolulu to Colombo time conversion table
| Honolulu (HST) | Colombo (IST) | Day |
|---|---|---|
| 12:00 AM | 3:30 PM | same day |
| 6:00 AM | 9:30 PM | same day |
| 7:00 AM | 10:30 PM | same day |
| 8:00 AM | 11:30 PM | same day |
| 9:00 AM | 12:30 AM | next day |
| 12:00 PM | 3:30 AM | next day |
| 3:00 PM | 6:30 AM | next day |
| 5:00 PM | 8:30 AM | next day |
| 6:00 PM | 9:30 AM | next day |
| 9:00 PM | 12:30 PM | next day |
Why people convert Honolulu to Colombo time
- Scheduling a call from Honolulu to Colombo: a 10:00 AM start in Honolulu lands at 1:30 AM in Colombo the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +15h 30m gap: Honolulu and Colombo 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 Colombo is 12:30 AM in Honolulu.
- Coordinating a Honolulu-based team with Colombo contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM HST" is unambiguous; "3 PM" across a +15h 30m gap is not.
- With a +15h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week Honolulu takes the early slot, the next week Colombo 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 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 Honolulu and Colombo
With a +15h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. Colombo opens at 9:00 AM IST, which is 12:30 AM in Honolulu, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Honolulu and Colombo have no shared working hours because of the +15h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.
Honolulu is 15 hours 30 minutes ahead of Colombo (HST UTC-10:00 → IST UTC+05:30). 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 Honolulu and Colombo?
Honolulu (HST, UTC-10:00) is 15 hours 30 minutes ahead of Colombo (IST, UTC+05:30). The gap is currently +15h 30m.
How do I convert Honolulu time to Colombo time?
Add +15h 30m to Honolulu local time. For example, 9:00 AM in Honolulu is 12:30 AM in Colombo (next day).
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 +15h 30m offset from Honolulu.
What is the best time to call Colombo from Honolulu?
There is no shared working-hours window because of the +15h 30m gap. The closest option is 1:00 PM in Honolulu, which is 4:30 AM in Colombo.
Which is ahead, Honolulu or Colombo?
Honolulu is 15 hours 30 minutes ahead of Colombo. When it is 12:00 PM in Honolulu it is 3:30 AM in Colombo.
Do Honolulu and Colombo use different time zones?
Honolulu (USA) uses HST at UTC-10:00, while Colombo (Sri Lanka) uses IST at UTC+05:30. The IANA identifiers are Pacific/Honolulu and Asia/Colombo.
Does daylight saving time affect the Honolulu–Colombo difference?
Neither zone observes daylight saving time, so the +15h 30m offset between Honolulu and Colombo is fixed all year.
Which other cities share Honolulu's time zone?
HST also covers Honolulu, Hilo, Kailua, Pearl City, Kapolei.
Which countries use HST, Honolulu's zone?
HST is used in United States (Hawaii).
Is there a day difference between Honolulu and Colombo?
Sometimes. The +15h 30m gap is large enough that 8:00 PM or later in Honolulu already falls on the next day in Colombo.
What is the time difference between Honolulu and Colombo?
Colombo is +15h 30m from Honolulu.
What timezone is Honolulu in?
Honolulu operates on Hawaii Standard Time (HST), UTC-10 with no daylight saving. Hawaii's consistent time makes it a predictable connection between Asia and mainland USA.
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 Honolulu?
Standard business hours in Honolulu are 8:00 AM - 5:00 PM HST.
What are the business hours in Colombo?
Standard business hours in Colombo are 9:00 AM - 5:00 PM IST.
What is the best time to schedule a call between Honolulu and Colombo?
The best overlap for a call is when both cities are in business hours. Honolulu works 8:00 AM - 5:00 PM HST and Colombo works 9:00 AM - 5:00 PM IST (+15h 30m difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Honolulu and Colombo?
Honolulu uses USD ($) while Colombo uses LKR (Rs). Check current exchange rates when planning travel or business between these cities.
How do Honolulu and Colombo compare in size?
Honolulu has a population of approximately 350,000 (metro: 1 million), while Colombo has approximately 752,000 (metro: 5.6 million).
What are the major landmarks in Honolulu and Colombo?
Honolulu is known for Waikiki Beach, Diamond Head, Pearl Harbor. Colombo is famous for Galle Face Green, Gangaramaya Temple, Colombo Lotus Tower.
Do Honolulu and Colombo have stock exchanges?
Yes. Honolulu has the N/A (Uses NYSE/NASDAQ) and Colombo has the CSE (Colombo Stock Exchange). The +15h 30m time difference affects trading hour overlaps between these exchanges.
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 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 Honolulu, what time is it in Colombo?
When it is 12:00 AM (midnight) in Honolulu (HST), it is +15h 30m later in Colombo (IST).
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