Does it handle Daylight Saving Time?

Yes, the tool automatically adjusts for Daylight Saving Time based on the specific date you select, ensuring accurate conversions year-round.

Can I add multiple cities?

Yes, you can add as many cities as you need to the dashboard to compare times across your entire global network simultaneously.

Colombo to Honolulu

-15h 30m

Colombo

ISTSOURCE

Sri Lanka · UTC+05:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Honolulu

HST

USA · UTC-10:00

HH08

MM30

(previous day)20:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Colombo

Honolulu

12:00 AM

8:30 AM-1

2:00 AM

10:30 AM-1

4:00 AM

12:30 PM-1

6:00 AM

2:30 PM-1

8:00 AM

4:30 PM-1

10:00 AM

6:30 PM-1

12:00 PM

8:30 PM-1

2:00 PM

10:30 PM-1

4:00 PM

12:30 AM

6:00 PM

2:30 AM

8:00 PM

4:30 AM

10:00 PM

6:30 AM

Green rows indicate typical business hours (9 AM - 5 PM)

IST and HST on the World Map

The map below highlights the IST (India Standard Time) and HST (Hawaii Standard Time) timezone regions across the globe.

IST Zone

→

HST Zone

Explore all world timezones interactively →

IST – India Standard Time

UTC+05:30

India Standard Time (IST) is the time zone for India and Sri Lanka, 5 hours and 30 minutes ahead of UTC.

Countries in IST

IndiaSri Lanka

Major Cities in IST

MumbaiDelhiBangaloreKolkataChennaiHyderabadPuneAhmedabadColomboJaipurLucknowSurat

Key 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.
•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.

Daylight Saving:No – UTC+05:30 year-round

Learn more about IST on Wikipedia

HST – Hawaii Standard Time

UTC-10:00

Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.

Countries in HST

United States (Hawaii)

Major Cities in HST

HonoluluHiloKailuaPearl CityKapolei

Key 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.
•Hawaii is one of only two US states that don't observe DST (the other is Arizona).

Daylight Saving:No – UTC-10:00 year-round

Learn more about HST on Wikipedia

About Colombo

Wikipedia

Colombo operates on Sri Lanka Time (SLST), UTC+5:30. Sharing India's timezone, Colombo is a key South Asian trade and tourism hub.

Population:752,000

Metro:5.6 million

Business Hours:9:00 AM - 5:00 PM IST

Currency:LKR (Rs)

Stock Exchange:CSE (Colombo Stock Exchange)

Key Landmarks

Galle Face GreenGangaramaya TempleColombo Lotus TowerIndependence SquareDutch Hospital

Did You Know?

Sri Lanka Standard Time (SLST) uses UTC+5:30, same offset as India.

Learn more about IST timezone →

About Honolulu

Wikipedia

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.

Population:350,000

Metro:1 million

Business Hours:8:00 AM - 5:00 PM HST

Currency:USD ($)

Key Landmarks

Waikiki BeachDiamond HeadPearl HarborIolani PalaceHanauma Bay

Did You Know?

Pearl Harbor memorial receives over 2 million visitors annually.

Learn more about HST timezone →

Everything You Need to Know About Colombo and Honolulu Time

Colombo runs on India Standard Time (IST) at UTC+05:30. Honolulu runs on Hawaii-Aleutian Standard Time (HST) at UTC-10:00. That puts Colombo 15 hours 30 minutes behind Honolulu — a difference of -15h 30m at the current offsets.

In practice, when it is 9:00 AM in Colombo it is 5:30 PM in Honolulu on the previous day. Midnight in Colombo is 8:30 AM in Honolulu. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Colombo to Honolulu time conversion table

Colombo (IST)	Honolulu (HST)	Day
12:00 AM	8:30 AM	previous day
6:00 AM	2:30 PM	previous day
7:00 AM	3:30 PM	previous day
8:00 AM	4:30 PM	previous day
9:00 AM	5:30 PM	previous day
12:00 PM	8:30 PM	previous day
3:00 PM	11:30 PM	previous day
5:00 PM	1:30 AM	same day
6:00 PM	2:30 AM	same day
9:00 PM	5:30 AM	same day

Why people convert Colombo to Honolulu time

Scheduling a call from Colombo to Honolulu: a 10:00 AM start in Colombo lands at 6:30 PM in Honolulu the previous day, so you can confirm the slot without doing the arithmetic yourself.
Handling a -15h 30m gap: Colombo and Honolulu 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 Honolulu is 5:30 PM in Colombo.
Booking travel or deliveries: tracking Honolulu local time against Colombo keeps pickup windows and arrival estimates honest across the -15h 30m offset.

Always state the zone abbreviation, not just the hour. "3:00 PM IST" 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 Colombo takes the early slot, the next week Honolulu does.

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 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.

Best time to call between Colombo and Honolulu

With a -15h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. Honolulu opens at 9:00 AM HST, which is 5:30 PM in Colombo, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

Colombo and Honolulu have no shared working hours because of the -15h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.

Colombo is 15 hours 30 minutes behind Honolulu (IST UTC+05:30 → HST UTC-10:00). 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:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between Colombo and Honolulu?

Colombo (IST, UTC+05:30) is 15 hours 30 minutes behind Honolulu (HST, UTC-10:00). The gap is currently -15h 30m.

How do I convert Colombo time to Honolulu time?

Add -15h 30m to Colombo local time. For example, 9:00 AM in Colombo is 5:30 PM in Honolulu (previous day).

What time is it in Honolulu right now?

Honolulu uses HST at UTC-10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -15h 30m offset from Colombo.

What is the best time to call Honolulu from Colombo?

There is no shared working-hours window because of the -15h 30m gap. The closest option is 1:00 PM in Colombo, which is 9:30 PM in Honolulu.

Which is behind, Colombo or Honolulu?

Colombo is 15 hours 30 minutes behind Honolulu. When it is 12:00 PM in Colombo it is 8:30 PM in Honolulu.

Do Colombo and Honolulu use different time zones?

Colombo (Sri Lanka) uses IST at UTC+05:30, while Honolulu (USA) uses HST at UTC-10:00. The IANA identifiers are Asia/Colombo and Pacific/Honolulu.

Does daylight saving time affect the Colombo–Honolulu difference?

Neither zone observes daylight saving time, so the -15h 30m offset between Colombo and Honolulu 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 Honolulu?

Sometimes. The -15h 30m gap is large enough that 8:00 PM or later in Colombo already falls on the in Honolulu.

What is the time difference between Colombo and Honolulu?

Honolulu is -15h 30m 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 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 are the business hours in Colombo?

Standard business hours in Colombo are 9:00 AM - 5:00 PM IST.

What are the business hours in Honolulu?

Standard business hours in Honolulu are 8:00 AM - 5:00 PM HST.

What is the best time to schedule a call between Colombo and Honolulu?

The best overlap for a call is when both cities are in business hours. Colombo works 9:00 AM - 5:00 PM IST and Honolulu works 8:00 AM - 5:00 PM HST (-15h 30m difference). Try scheduling during the overlapping window for maximum convenience.

What currencies are used in Colombo and Honolulu?

Colombo uses LKR (Rs) while Honolulu uses USD ($). Check current exchange rates when planning travel or business between these cities.

How do Colombo and Honolulu compare in size?

Colombo has a population of approximately 752,000 (metro: 5.6 million), while Honolulu has approximately 350,000 (metro: 1 million).

What are the major landmarks in Colombo and Honolulu?

Colombo is known for Galle Face Green, Gangaramaya Temple, Colombo Lotus Tower. Honolulu is famous for Waikiki Beach, Diamond Head, Pearl Harbor.

Do Colombo and Honolulu have stock exchanges?

Yes. Colombo has the CSE (Colombo Stock Exchange) and Honolulu has the N/A (Uses NYSE/NASDAQ). The -15h 30m time difference affects trading hour overlaps between these exchanges.