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.

Ireland to Honolulu

-11h

Ireland

ISTSOURCE

UTC+01:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Honolulu

HST

USA · UTC-10:00

HH01

MM00

01:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Ireland

Honolulu

12:00 AM

1:00 PM-1

2:00 AM

3:00 PM-1

4:00 AM

5:00 PM-1

6:00 AM

7:00 PM-1

8:00 AM

9:00 PM-1

10:00 AM

11:00 PM-1

12:00 PM

1:00 AM

2:00 PM

3:00 AM

4:00 PM

5:00 AM

6:00 PM

7:00 AM

8:00 PM

9:00 AM

10:00 PM

11:00 AM

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

IST and HST on the World Map

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

IST Zone

→

HST Zone

Explore all world timezones interactively →

GMT – Greenwich Mean Time

UTC+00:00

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.

Countries in GMT

United KingdomIrelandIcelandPortugal (mainland)GhanaSenegalMaliMauritaniaGambiaGuineaSierra LeoneLiberiaIvory CoastBurkina FasoMorocco (historically)

Major Cities in GMT

LondonDublinLisbonAccraReykjavikEdinburghCasablancaDakarBamakoAbidjanConakryFreetownMonrovia

Key Facts about GMT

•GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
•The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
•GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
•Iceland uses GMT year-round and never observes daylight saving time.
•The UK switches from GMT to BST (British Summer Time) in late March each year.

Daylight Saving:Yes – switches to BST

Learn more about GMT 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 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 →

Ireland to Honolulu Time Difference – Complete Guide

Ireland runs on Irish Standard Time (IST) at UTC+01:00, currently observing daylight saving time. Honolulu runs on Hawaii-Aleutian Standard Time (HST) at UTC-10:00. That puts Ireland 11 hours behind Honolulu — a difference of -11h at the current offsets.

In practice, when it is 9:00 AM in Ireland it is 10:00 PM in Honolulu on the previous day. Midnight in Ireland is 1:00 PM in Honolulu.Ireland observes daylight saving time while Honolulu does not, so the gap narrows or widens by an hour part of the year.

Ireland to Honolulu time conversion table

Ireland (IST)	Honolulu (HST)	Day
12:00 AM	1:00 PM	previous day
6:00 AM	7:00 PM	previous day
7:00 AM	8:00 PM	previous day
8:00 AM	9:00 PM	previous day
9:00 AM	10:00 PM	previous day
12:00 PM	1:00 AM	same day
3:00 PM	4:00 AM	same day
5:00 PM	6:00 AM	same day
6:00 PM	7:00 AM	same day
9:00 PM	10:00 AM	same day

Why people convert Ireland to Honolulu time

Scheduling a call from Ireland to Honolulu: a 10:00 AM start in Ireland lands at 11:00 PM in Honolulu the previous day, so you can confirm the slot without doing the arithmetic yourself.
Handling a -11h gap: Ireland 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 10:00 PM in Ireland.
Keeping family and friends in sync: knowing that 8:00 PM in Ireland is 9:00 AM in Honolulu makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM IST" is unambiguous; "3 PM" across a -11h gap is not.
With a -11h gap there is no shared 9-to-5 window, so alternate the early start: one week Ireland takes the early slot, the next week Honolulu does.
Ireland: Clocks fall back on Sun, Oct 25, 2026. Re-check this page after that date because the offset changes and so does the -11h gap.

About GMT (Greenwich Mean Time)

Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.

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 Ireland and Honolulu

With a -11h offset there is no overlap inside a normal 9 AM – 5 PM day. Honolulu opens at 9:00 AM HST, which is 10:00 PM in Ireland, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

Ireland and Honolulu have no shared working hours because of the -11h gap. Teams need to alternate early starts or rely on asynchronous handovers.

Ireland is 11 hours behind Honolulu (IST UTC+01:00 → 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.

🕐 Daylight Saving Time Info

Ireland

☀ Currently in DST

Standard: UTC+00:00 · DST: UTC+01:00

Clocks fall back on Sun, Oct 25, 2026

Honolulu

Does not observe DST

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 Ireland and Honolulu?

Ireland (IST, UTC+01:00) is 11 hours behind Honolulu (HST, UTC-10:00). The gap is currently -11h.

How do I convert Ireland time to Honolulu time?

Add -11h to Ireland local time. For example, 9:00 AM in Ireland is 10:00 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 -11h offset from Ireland.

What is the best time to call Honolulu from Ireland?

There is no shared working-hours window because of the -11h gap. The closest option is 1:00 PM in Ireland, which is 2:00 AM in Honolulu.

Which is behind, Ireland or Honolulu?

Ireland is 11 hours behind Honolulu. When it is 12:00 PM in Ireland it is 1:00 AM in Honolulu.

Do Ireland and Honolulu use different time zones?

Ireland (Ireland) uses IST at UTC+01:00, while Honolulu (USA) uses HST at UTC-10:00. The IANA identifiers are Europe/Dublin and Pacific/Honolulu.

Does daylight saving time affect the Ireland–Honolulu difference?

Yes at the moment: Ireland is on daylight saving time and Honolulu is not, so the -11h gap shifts by an hour when exactly one of them changes clocks.

Which other cities share Ireland's time zone?

IST also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.

Which countries use IST, Ireland's zone?

IST is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.

Is there a day difference between Ireland and Honolulu?

Not normally. The -11h gap only pushes the date over the previous day.

What is the time difference between Ireland and Honolulu?

Honolulu is -11h from Ireland.

What timezone is Ireland in?

Ireland operates on its local timezone.

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 Honolulu?

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

Which countries use GMT (Greenwich Mean Time)?

GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, and 9 more countries.

Does GMT observe daylight saving time?

Yes, GMT switches to BST during summer months.

What are some interesting facts about GMT?

GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.