Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

Honolulu to IST

+15h 30m

Honolulu

HSTSOURCE

USA · UTC-10:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

IST

UTC+05:30

HH03

MM30

(next day)03:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Honolulu

IST

12:00 AM

3:30 PM

2:00 AM

5:30 PM

4:00 AM

7:30 PM

6:00 AM

9:30 PM

8:00 AM

11:30 PM

10:00 AM

1:30 AM+1

12:00 PM

3:30 AM+1

2:00 PM

5:30 AM+1

4:00 PM

7:30 AM+1

6:00 PM

9:30 AM+1

8:00 PM

11:30 AM+1

10:00 PM

1:30 PM+1

Green 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 Zone

→

IST Zone

Explore all world timezones interactively →

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

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

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 →

Honolulu vs IST: Offsets, DST and Best Call Times

Honolulu runs on Hawaii-Aleutian Standard Time (HST) at UTC-10:00. IST runs on India Standard Time (IST) at UTC+05:30. That puts Honolulu 15 hours 30 minutes ahead of IST — 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 IST on the next day. Midnight in Honolulu is 3:30 PM in IST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Honolulu to IST time conversion table

Honolulu (HST)	IST (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 IST time

Scheduling a call from Honolulu to IST: a 10:00 AM start in Honolulu lands at 1:30 AM in IST the next day, so you can confirm the slot without doing the arithmetic yourself.
Handling a +15h 30m gap: Honolulu and IST 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 IST is 12:30 AM in Honolulu.
Keeping family and friends in sync: knowing that 8:00 PM in Honolulu is 11:30 AM in IST makes it easy to avoid calling at 3 AM.

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 IST 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 IST

With a +15h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. IST 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 IST 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 IST (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:

⏳

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 Honolulu and IST?

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

How do I convert Honolulu time to IST time?

Add +15h 30m to Honolulu local time. For example, 9:00 AM in Honolulu is 12:30 AM in IST (next day).

What time is it in IST right now?

IST 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 IST 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 IST.

Which is ahead, Honolulu or IST?

Honolulu is 15 hours 30 minutes ahead of IST. When it is 12:00 PM in Honolulu it is 3:30 AM in IST.

Do Honolulu and IST use different time zones?

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

Does daylight saving time affect the Honolulu–IST difference?

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

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

What is the time difference between Honolulu and IST?

IST 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.